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Scientific Data Documentation
National Hospital Discharge Survey, 1997
 DSN: CC36.NHDS97

 Abstract

  This material provides documentation for users of the 1997 NHDS Public Use Data Tape. The NHDS is     
  conducted annually by the National Center for Health Statistics (NCHS) and is a principal source of 
  information on inpatient hospital utilization in the United States.

  Section II provides technical details of the tape.

  Section III provides a detailed description of the contents of each data record.

  Section I describes the survey and includes information on the history and scope of the NHDS; the 
  methodology followed, including data collection and medical coding procedures; population estimates; 
  measurement errors and sampling errors

  Appendix A defines certain terms used in this document; Appendix B lists the ICD-9-CM Addenda;   
  Appendix C provides population estimates to allow the user to calculate rates; and Appendix D provides 
  unweighted and weighted frequencies for selected variables.


  Table Of Contents

  Section I. Description of the National Hospital Discharge Survey 3

  Section II. Technical Description of Tape 15

  Section III. Record Layout: Location and Coding of Data Elements 16

  Appendix A: Definitions of Certain Terms Used in This Document 19

  Appendix B: ICD-9-CM Addenda 22

  Appendix C: Population Estimates 50

  Appendix D: Unweighted & Weighted Frequencies of Selected NHDS Variables 57


  I. Description of The National Hospital Discharge Survey

   Introduction.

  This document and its appendices contain information for users of the 1997 National Hospital Discharge   
  Survey (NHDS) public use data file. Conducted annually by the National Center for Health Statistics, NHDS 
  collects medical and demographic information from a sample of discharge records selected from a national 
  sample of nonFederal, short-stay hospitals. The data serve as a basis for calculating statistics on inpatient 
  hospital utilization in the United States. For a description of the survey design and data collection procedures,  
  see below. For a more detailed description of the survey design, data collection procedures, and the 
  estimation process, see Reference 1. Publications based on the data for each survey year can be obtained from 
  the Government Printing Office.

  History.

  To provide more complete and precise information on the utilization of the Nation's hospitals and on the 
  nature and treatment of illness among the hospitalized population, in 1962 the NCHS began exploring 
  possibilities for surveying morbidity in hospitals. A national advisory group was established. The NCHS 
  conducted planning discussions with other officials of the Public Health Service. Hospitalization material from 
  the Survey Research Center of the University of Michigan, the American Hospital Association, and the 
  Professional Activities Study was examined and evaluated. In 1963, a study by the School of Public Health of 
  the University of  Pittsburgh under contract to the NCHS demonstrated the feasibility of an NHDS type 
  of program. An additional pilot study using enumerators from the Bureau of the Census was conducted in late 
  1964 and confirmed the University of Pittsburgh's findings.

  Finally, with advice and support from the American Hospital Association, the American Medical Association, 
  individual experts, other professional groups, and officials of the U.S. Public Health Service, the NCHS   
  initiated the National Hospital Discharge Survey in 1964.

 Survey Methodology

  Source of the Data.

  The National Hospital Discharge Survey (NHDS) covers discharges from noninstitutional hospitals, exclusive 
  of Federal, military, and Veterans Administration hospitals, located in the 50 States and the District of 
  Columbia. Only short-stay hospitals (hospitals with an average length of stay for all patients of less than 30 
  days) or those whose specialty is general (medical or surgical) or children's general are included in the survey.   
  These hospitals must also have six or more beds staffed for patient use. These criteria, used from 1988 
  through  the current survey year, differ slightly from those used prior to 1988.


  Beginning in 1988, the NHDS sampling frame consisted of hospitals that were listed in the April 1987 SMG 
  Hospital Market Tape (2), met the above criteria, and began accepting patients by August 1987. For 1997 
  the sample consisted of 513 hospitals. Of the 513 hospitals, 12 were found to be out of scope (ineligible) 
  because they went out of business or otherwise failed to meet the criteria for the NHDS universe. Of the 501 
  inscope (eligible) hospitals, 474 hospitals responded to the survey.

  Sample design and data collection.

  The NCHS has conducted the NHDS continuously since 1965. The original sample was selected in 1964 
  from a frame of short-stay hospitals listed in the National Master Facility Inventory. That sample was updated 
  periodically with samples of hospitals that opened later. Sample hospitals were selected with probabilities 
  ranging from certainty for the largest hospitals to 1 in 40 for the smallest hospitals. Within each sample hospital, 
  a systematic random sample of discharges was selected. A report on the design and development of the 
  original NHDS has been published (1).

  In 1988, the NHDS was redesigned to provide geographic sampling comparability with other surveys 
  conducted by the NCHS; to update the sample of hospitals selected into the survey; and to maximize the use 
  of data collected through automated systems. The redesigned NHDS sample included with certainty all 
  hospitals with 1,000 or more beds or 40,000 or more discharges annually. The remaining sample of hospitals 
  was based on a stratified, three-stage design. The first stage consisted of selecting 112 primary sampling units 
  (PSU's) that comprised a probability subsample of PSU's used in the 1985-94 National Health Interview 
  Survey.  The second stage consisted of selecting non-certainty hospitals from the sample PSU's. At the third 
  stage a sample of discharges was selected by a systematic random sampling technique.

  These changes in the survey may affect trend data. That is, some of the differences between NHDS statistics 
  based on the 1965-87 sample and statistics based on the sample drawn for the new design may be due to 
  sampling error rather than actual changes in hospital utilization.

  Two data collection procedures were used for the survey. The first was a manual system of sample selection 
  and data abstraction, used for approximately 60 percent of the responding hospitals. The second was an 
  automated method, used for approximately 40 percent of the respondent hospitals, that involved the purchase 
  of computerized data tapes from abstracting service organizations, state data systems, or from the hospitals 
  themselves.

  In the manual system, the sample selection and the transcription of information from the hospital records to 
  abstract forms were performed at the hospitals. Of the hospitals using this system in 1997, about 33 percent 
  had the work performed by their own medical records staff. In the remaining hospitals using the manual 
  system,  personnel of the U.S. Bureau of the Census did the work on behalf of NCHS. The completed forms, 
  along with sample selection control sheets, were forwarded to NCHS for coding, editing, and weighting.

  For the automated system, NCHS purchased tapes containing machine-readable medical record data from 
  which records were systematically sampled by NCHS.

  The Medical Abstract Form (Figure 1) and the automated data contain items relating to the personal 
  characteristics of the patient, including birth date or age, sex, race, and marital status, but not name and 
  address; administrative information, including admission and discharge dates, discharge status, and medical 
  record number; and medical information, including diagnoses and surgical and nonsurgical procedures. Since 
  1977, patient zip code, expected source of payment, and dates of surgery have also been collected. (The 
  medical record number, date of birth, and patient zip code are confidential information and are not available to 
  the public.)

  Medical Coding and Edit.

  The medical information that was recorded manually on the sample patient abstracts was coded centrally by 
  NCHS staff. A maximum of seven diagnostic codes was assigned for each sample abstract. In addition, if the 
  medical information included surgical or nonsurgical procedures, a maximum of four codes for these 
  procedures was assigned. The system currently used for coding the diagnoses and procedures on the medical 
  abstract forms as well as on the commercial abstracting services data tapes is the International 
  Classification of Diseases, 9th Revision, Clinical Modification,
or ICD-9-CM (3).

  NHDS usually presents diagnoses and procedures in the order they are listed on the abstract form or obtained 
  from abstract services; however, there are exceptions. For women discharged after a delivery, a code of V27 
  from the supplemental classification is entered as the first-listed code, with a code designating either normal or 
  abnormal delivery in the second-listed position. In another exception, a decision was made to reorder some 
  acute myocardial infarction diagnoses. If an acute myocardial infarction is listed with other circulatory 
  diagnoses and is other than the first entry, it is reordered to first position.  If a symptom appears as a first-listed 
  code and a diagnosis appears as a secondary code, the diagnosis replaces the symptom which is moved back.


  Figure 1. Medical abstract for the 1997 National Hospital Discharge Survey

  Following conversion of the data on the medical abstract to computer tape and combining it with the 
  automated data tapes, a final medical edit was accomplished by computer inspection and by a manual 
  review of rejected records. Priority was given to medical information in the editing decision.

  A new edit program was developed for the NHDS and was implemented beginning in the 1996 data year. The 
  updated edit program, while following the same general specifications as the previous edit program, was 
  designed to make as few changes as possible in the data. Thus, there may be some minor anomalies in certain 
  areas which would be apparent when examining data over time, performing trend analyses, or examining 
  combinations of variables. Particular features of the new edit program which may affect certain variables are:

  • An improved imputation procedure for missing age and sex data was developed, which maintains the known distribution of these variables, according to categories of the First-Listed Diagnosis.
  • There is no longer a re-ordering of the procedure codes.
  • Principal and additional expected sources of payment are no longer re-ordered, with one exception: "Self-Pay" is listed as the principal source only if there are no other sources, or the only other source is "Not Stated"; otherwise it must be listed after every other source (except "Not Stated").
  • An arbitrary month of admission is no longer assigned to records received from abstract services which do not provide the exact date of admission and discharge.

  Users of the National Hospital Discharge Survey (NHDS) diagnostic and/or procedure data, which is coded 
  to the ICD-9-CM, must take into account annual ICD-9-CM addenda. The addenda lists new codes, new 
  fourth or fifth digits to existing codes, as well as other modifications. Changes go into effect October 1 of the 
  calendar year. A list of the changes for 1986 through 1996 are listed in Appendix B. All coding of the 1997 
  data is consistent with the ICD-9-CM and the addendum effective October 1, 1996. Information provided by 
  automated systems for the last three months of 1997 which was coded using the October 1997 addendum 
  was converted back to the previous code assignment. This was done in order to prevent NHDS data users 
  from mistaking partial year estimates for annual estimates.

  The Uniform Hospital Discharge Data Set (UHDDS).

  Starting with 1979 data, the NHDS has followed guidelines of the Uniform Hospital Discharge Data Set 
  (UHDDS) within the confines of its contractual agreement with participating hospitals. The UHDDS is a 
  minimum data set of items uniformly defined (4). These items were selected on the basis of their usefulness to a 
  broad range of organizations and agencies requiring hospital information, uniformity of definition, and general 
  availability from medical records and abstract services.

  Population Estimates.

  Appendix C shows estimates of the civilian population of the United Stated as of July 1, 1997, which have 
  been provided by the U.S. Bureau of the Census. Figures are consistent with national population estimates in 
  PPL-91R (U.S. Population Estimates by Age, Sex, Race and Hispanic Origin: 1990-1997) and have been 
  adjusted for net underenumeration using the 1990 National Population Adjustment Matrix.

  *Note that prior to the 1997 data year, Census estimates of the civilian population provided with the NHDS 
  public use data tape documentation were not adjusted for the undercount.

  Measurement Errors.

  As in any survey, results are subject to nonsampling or measurement errors, which include errors due to 
  hospital nonresponse, missing abstracts, information incompletely or inaccurately recorded on abstract forms, 
  and processing errors. A very small proportion, (less than one-half of one percent) of the discharge records 
  failed to include the sex, age, or date of birth of the patient. If the hospital record did not state either the age or 
  sex of patient, it was imputed by assigning an age or sex value according to the specifications described earlier. 
  In a very few cases (about a quarter of a percent of the records), the age or sex was edited, because it was 
  inconsistent with the diagnosis. Data on race was missing for 25 percent of the discharges, and no attempt was 
  made to impute for these missing values.

  During 1997, 16.5 percent of the records lacked the date of admission, but included a length of stay. Because 
  the new edit program does not require exact admission or discharge dates if length of stay is provided on the 
  record, no attempt was made to impute for these missing values.

  Other edit and imputation procedures may have been applied to data in the NHDS collected in automated 
  form.

  Sampling errors and rounding of numbers.

  The standard error is primarily a measure of sampling variability that occurs by chance because only a sample 
  rather than the entire universe is surveyed. The relative standard error of the estimate is obtained by dividing 
  the standard error by the estimate itself. The resulting value is multiplied by 100, so the relative standard error 
  is expressed as a percent of the estimate. Estimates of sampling variability were calculated with SUDAAN 
  software, which computes standard errors by using a first-order Taylor series approximation of the deviation 
  of estimates from their expected values. A description of the software and the approach it uses was published 
  by Shah, Barnwell, and Bieler (5).

 Relative Standard Errors for Aggregate Estimates

  Parameters for calculating approximate relative standard errors for aggregate estimates are presented in 
  Table 1. To derive error estimates that would be applicable to a wide variety of statistics, numerous estimates 
  and their variances were produced. A regression model was then used to produce best-fit curves, based on 
  the empirically determined relationship between the size of an estimate X and its relative variance. The relative 
  standard error of an estimate X [RSE(X)] is the square root of the relative variance and may be calculated 
  from the formula:

RSE(X) = 100 * SQRT {a + b/X}

  with a and b provided in Table 1. When multiplied by 100, the RSE(X) is expressed as a percent of X.

  For example, in 1997 the estimated number of discharges from short-stay hospitals for females with a 
  first-listed diagnosis of atherosclerotic heart disease (ICD-9-CM code 414.0) was 384,000. Using the 
  applicable constants from Table 1 for estimates by sex produces:

RSE(384,000) = .046

  When multiplied by 100, the relative standard error for the estimate of interest becomes 4.6 percent. The 
  standard error of the estimate is obtained by multiplying the relative standard error by the estimate itself:

SE(384,000) = 384,000 * .046 = 17,664


  The standard error can be employed to generate confidence intervals for statistical testing. In this example, 
  the 95% confidence interval for the estimate of female inpatients with a first-listed diagnosis of atherosclerotic 
  heart disease is:

(384,000 - 2*17,664) <-> (384,000 + 2*17,664)

348,700 <-> 419,300


  Relative Standard Error for Estimates of Percents

  Approximate relative standard errors for estimates of percents may be calculated from Table 1 also. The 
  relative standard error for a percent, 100 p (0<p<1) may be calculated using the formula:

 

  where 100p is the percent of interest, X is the base of the percent, and b is the parameter b in the formula for 
  approximating the RSE(X). The values for b are given in Table 1. When multiplied by 100, the RSE(p) is 
  expressed as a percent of the estimate, p.


  For example, in 1997 the estimated number of discharges from short-stay hospitals which were female was 
  18,647,000. This is 60.3 percent of the estimated 30,914,000 discharges for that year. Using the applicable 
  constants from Table 1 for estimates by sex produces:

RSE(.603) = .002635


  When multiplied by 100, the relative standard error for the estimate of interest becomes .2635 percent. 
  From this the standard error is obtained by multiplying the relative standard error by the estimate itself:

SE(.603) = .603* 0.002635 = .0016


  The standard error can be employed to generate confidence intervals for statistical testing. In this example, 
  the 95% confidence interval for the estimate of the percentage of female inpatients is:

(.603 - 2*.0016) <-> (.603 + 2*.0016)

.5998 <-> .6062

or, equivalently

59.98% <-> 60.62%



  Table 1.

  Parameter values for relative standard errors for National Hospital Discharge Survey aggregate statistics by 
  statistic type:   United States, 1997

  FIRST-LISTED DIAGNOSIS DAYS OF CARE ALL-LISTED DIAGNOSES ALL-LISTED PROCEDURES
Characteristic a b a b a b a b
TOTAL 0.00132 313.983 0.00242 1,036.029 0.00271 428.987 0.00288 323.247
SEX                
Male 0.00148 335.128 0.00299 1,309.507 0.00214 307.917 0.00268 380.213
Female 0.00127 325.984 0.00252 1,060.275 0.00127 311.394 0.00197 299.725
AGE GROUP                
Under 15 years 0.01470 181.262 0.02393 346.675 0.01617 223.921 0.02639 196.719
15-44 years 0.00137 294.357 0.00285 934.043 0.00151 309.115 0.00219 305.574
45-64 years 0.00138 301.320 0.00284 1,248.476 0.00290 370.245 0.00235 298.267
65 years and over 0.00147 343.779 0.00275 1,866.761 0.00144 361.717 0.00239 292.252
REGION                
Northeast 0.00384 195.564 0.00863 495.447 0.00592 239.709 0.00695 219.126
Midwest 0.00609 191.492 0.00866 481.071 0.00853 180.424 0.00870 163.190
South 0.00369 320.084 0.00572 1,581.301 0.00307 341.005 0.00498 274.548
West 0.00513 338.516 0.01008 926.285 0.00508 378.827 0.00663 288.835
RACE                
White 0.00300 314.704 0.00480 1,103.096 0.00357 314.530 0.00463 369.830
Black 0.00529 248.048 0.00822 875.877 0.00519 236.801 0.00662 225.180
All other 0.01770 200.033 0.02524 581.314 0.01615 224.604 0.02070 211.065
Race not stated 0.01973 196.517 0.02387 394.423 0.02002 187.166 0.02126 142.769
ESOP                
Worker's Comp 0.00721 320.711 0.01413 896.903 0.01093 337.073 0.01143 270.432
Medicare 0.00171 325.698 0.00301 1,822.158 0.00157 372.529 0.00264 297.577
Medicaid 0.00438 293.366 0.00709 685.261 0.00379 287.541 0.00540 282.342
Payment not stated 0.00962 313.407 0.01966 1,484.182 0.01219 310.942 0.01814 248.591
Other Govt Pymts 0.00181 278.864 0.00345 617.794 0.00199 299.815 0.00265 289.092
Private insurance 0.00373 265.383 0.00994 854.606 0.00415 281.681 0.00689 227.293
Self pay 0.02771 94.095 0.03240 244.803 0.03212 127.947 0.03297 94.813
NC/Other 0.01828 394.867 0.02548 1,488.967 0.01931 386.315 0.02059 388.354


  Presentation of Estimates.

  Publication of estimates for the NHDS is based on the relative standard error of the estimate and the number 
  of sample records on which the estimate is based (referred to as the sample size). Estimates are not presented 
  in NCHS reports unless a reasonable assumption regarding the probability distribution of the sampling error is 
  possible.

  Based on consideration of the complex sample design of the NHDS, the following guidelines are used for 
  presenting the NHDS estimates:

  • If the sample size is less than 30, the value of the estimate is not reported.
  • If the sample size is 30-59, the value of the estimate is reported but should not be assumed reliable.
  • If the sample size is 60 or more and the relative standard error is less than 30 percent, the estimate is reported.
  • If the sample size is 60 or more but the relative standard error is over 30 percent, the estimate is reported but
    should not be assumed reliable.

  Monthly and Seasonal Estimates Under the New Design.

  An important difference between the old and new designs is the method used to adjust for nonresponse. In the 
  old design, weights for responding hospitals were adjusted each month to account for hospitals that did not 
  respond for that month. In the new design, the type of nonresponse adjustment applied depended on whether 
  the hospital was considered a nonrespondent or partial respondent. A nonresponding hospital was one which 
  failed to provide at least half of the expected number of discharges for at least half of the months for which it 
  was inscope. In this case, weights of discharges from hospitals similar to the nonresponding hospital were 
  inflated to account for discharges of the nonrespondent hospital. However, this adjustment was performed 
  just once, after the close out of the survey for the year, instead of monthly as before.

  For partially responding hospitals, one or both of two adjustments were made. If the hospital provided at least 
  half, but not all, of the expected number of abstracts for a given month, the weights of the abstracts actually 
  collected for that month were inflated to account for the missing abstracts. If fewer than half of the expected 
  number of abstracts were provided, the weights of the abstracts provided were inflated by a factor of two, 
  then a second adjustment was made to account for the excess nonresponse. In the second adjustment, the 
  weights of the discharges in the hospital's respondent months were inflated by ratios that varied by category of 
  first-listed ICD-9-CM diagnostic code. This adjustment ratio was based on the hospital's month(s) of 
  nonresponse and the month-by-month distributions of first-listed diagnostic groups among discharges from 
  hospitals which responded for all twelve months. The ratio accounts for the seasonality in the occurrence of the 
  first-listed diagnostic groups for annual statistics, but not for partial year estimates. As a result monthly and 
  seasonal estimates may be skewed. While the effect is believed to be small, it is recommended that partial year 
  estimates NOT be produced. In the 1997 NHDS, 87 percent of the 474 responding hospitals provided data 
  for all twelve months, and 97 percent provided at least 9 months of data.

  How to Use the Data Tape.

  The NHDS records are weighted to allow inflation to national or regional estimates. The weight applied to 
  each record is found in tape location 21-25. To produce an estimate of the number of discharges, the weights 
  for the desired records must be summed. To produce an estimate for number of days of care, the weight must 
  be multiplied by the days of care (tape location 13-16) and these products are summed. Average length of 
  stay data can be obtained by dividing the days of care by the number of discharges as calculated above.

  Appendix D contains unweighted and weighted frequencies for selected variables on the data tape. These may 
  be used as a cross-check when processing the data on the user's system.

  Diagnosis-Related Groups (DRGs).

  Many users of the NHDS data tapes have expressed an interest in converting the data to DRGs. This has been 
  done using DRG Grouper Programs obtained from the Health Care Financing Administration. The DRGs and 
  the DRG Grouper Programs were developed outside of the National Center for Health Statistics; any 
  questions about DRGs, other than specific questions about how they relate to NHDS data, should be 
  addressed elsewhere.

  Questions.

  Questions concerning data on the tape should be directed to Maria Owings, Ph.D., Hospital Care Statistics 
  Branch, Division of Health Care Statistics, National Center for Health Statistics, Presidential Building, Room 
  956, 6525 Belcrest Road, Hyattsville, Maryland 20782, (301)-436-7125.


 References

  1. National Center for Health Statistics: Development of the design of the NCHS Hospital Discharge Survey, by W. R. Simmons. Vital and Health  Statistics. PHS Pub. No. 1000, Series 2-No. 39. Public Health Service.  Washington.  U.S. Government Printing Office, Sept. 1970.
  2. SMG Hospital Marketing Group, Inc. 1989. Hospital Market Database. Healthcare Information Specialists, 1342 North LaSalle Drive, Chicago, Illinois.
  3. National Center for Health Statistics: International Classification of Diseases, 9th Revision, Clinical Modification.  DHHS Pub. No. (PHS) 80-1260. Public Health Service. Washington. U.S. Government Printing Office, Sept. 1980.
  4. Office of the Secretary, Department of Health and Human Services: Health Information Policy Council: 1984 Revision of the Uniform Hospital Discharge Data Set. Federal Register, Volume 50, No. 147. July 31, 1985.
  5. Shah, Babubhai.V., Beth G. Barnwell, and Gayle S. Bieler. SUDAAN User's Manual: Software for Analysis of Correlated Data, Release 6.40. Research Triangle Institute: Research Triangle Park, N.C. 1997.


 II. Technical Description Of Tape

  Data Set Name------------------------------------------------------BG00.NHDS97.PU

  Number of REELS or CARTRIDGES--------------------------------------------------1

  Number of Recording Tracks, REEL----------------------------------------------------9

  Number of Recording Tracks, CARTRIDGE------------------------------------------18

  Density for REEL (bpi)-------------------------------------------------------------6,250

  Density for CARTRIDGE (bpi)---------------------------------------------------38,000

  Language-----------------------------------------------------------------------EBCDIC

  Parity--------------------------------------------------------------------------------Odd

  Record Length-------------------------------------------------------------------------81

  Block Size------------------------------------------------------------------------16,200

  Number of Records-------------------------------------------------------------300,464

 

 III. Record Format: Location and Coding of Data Elements

  This section provides detailed information for each sampled record on the tape, with a description of each item 
  included on the record. Data elements are arranged sequentially according to their physical location on 
  the tape record. Unless otherwise stated in the Item Description, the data are derived from the abstract form or 
  from automated sources. The SMG Hospital Market Tape and the hospital interview are alternate sources of 
  data; some other items are computer generated.

 Item    Tape         
 Number  Location    Positions       Item Description and Codes

  1         1-2           2          Survey Year:    97
  
  2         3             1          Newborn Status: 1 = Newborn
                                                     2 = Not Newborn

  3         4             1          Units for Age:  1 = Years
                                                     2 = Months
                                                     3 = Days

  4         5-6           2           Age in years, months, or days: 
                                                     If Units = Years: 0-99*
                                                     If Units = Months: 01-11
                                                     If Units = Days: 00-31

  5         7             1           Sex:           1 = Male
                                                     2 = Female

  6         8             1           Race:          1 = White 
                                                     2 = Black
                                                     3 = American Indian/Eskimo
                                                     4 = Asian/Pacific Islander
                                                     5 = Other
                                                     9 = Not Stated

  7         9             1          Marital Status: 1 = Married
                                                     2 = Single
                                                     3 = Widowed
                                                     4 = Divorced
                                                     5 = Separated
                                                     9 = Not Stated

  8         10-11         2          Month of Admission: 
                                                     01-12: January to December
                                                     99: Missing 

 -------------------------------------------------------------------------------------

   * Ages 100 and over were recoded to 99.

 Item    Tape         
 Number  Location    Positions       Item Description and Codes

  9        12             1          Discharge Status: 
                                                   1= Routine/Discharged Home
                                                   2 = Left Against Medical Advice
                                                   3 = Discharged/Transferred to 
                                                       Short-Term Facility 
                                                   4 = Discharged/Transferred to
                                                       Long-Term Care Institution
                                                   5 = Alive, Disposition Not Stated
                                                   6 = Dead
                                                   9 = Not Stated or Not Reported 

  10       13-16          4           Days of Care: 
                                          Use to calculate number of days of care;
                                          Values of zero generated by the computer 
                                          from admission and discharge dates were 
                                          changed to one. (Discharges for which 
                                          dates of admission and discharge
                                          are the same are identified in Item 
                                          Number 11.)

  11       17             1           Length of Stay Flag: 
                                                   0 = Less than 1 day
                                                   1 = 1 day or more

  12       18             1           Geographic Region:   
                                                   1 = Northeast
                                                   2 = Midwest
                                                   3 = South
                                                   4 = West

  13       19             1           Number of Beds, Recode: 
                                                   1 = 6-99
                                                   2 = 100-199
                                                   3 = 200-299
                                                   4 = 300-499
                                                   5 = 500 and over

  14       20            1            Hospital Ownership:     
                                                   1 = Proprietary
                                                   2 = Government
                                                   3 = Nonprofit, including Church

  15       21-25         5            Analysis Weight:  
                                          Use to obtain weighted estimates
  
  16       26            1            Principal Expected Source of Payment:
                                                   0 = No Charge
                                                   1 = Workmen's Compensation
                                                   2 = Medicare
                                                   3 = Medicaid
                                                   4 = Other Govt Payments, incl. 
                                                       Title V
                                                   5 = Blue Cross
                                                   6 = Other Private/Comm'l 
                                                       Insurance
                                                   7 = Self-Pay
                                                   8 = Other
                                                   9 = Not Stated 

  17       27           1            Secondary Expected Source of Payment:
                                         Same coding as item 16

  18       28-32        5            Diagnosis Code #1 *

  19       33-37        5            Diagnosis Code #2 *

  20       38-42        5            Diagnosis Code #3 *

  21       43-47        5            Diagnosis Code #4 *

  22       48-52        5            Diagnosis Code #5 *

  23       53-57        5            Diagnosis Code #6 *

  24       58-62        5            Diagnosis Code #7 *

  25       63-66        4            Procedure Code #1 *

  26       67-70        4            Procedure Code #2 *

  27       71-74        4            Procedure Code #3 *

  28       75-78        4            Procedure Code #4 *

  29       79-81        3            DRG, Grouper Version 14.0

 --------------------------------------------------------------------------
 * Codes are in compliance with the International Classification of Diseases, 
 9th Revision, Clinical Modification, ICD-9-CM).

  For diagnosis codes, there is an implied decimal between positions 3 and 4. For E-codes, the implied decimal is between the  
  4th and 5th position. For inapplicable 4th or 5th digits, a dash is inserted.

  For procedure codes, there is an implied decimal between positions 2 and 3. For inapplicable 3rd or 4th digits, a dash is 
  inserted.


 Appendix A  -  Definition Of Terms

 Terms relating to hospitals and hospitalization

  Hospitals: Short stay hospitals or hospitals whose specialty is general (medical or surgical), or children's 
  general. Hospitals must have 6 beds or more staffed for patients use. Federal hospitals and hospital units of 
  institutions are not included.

  Type of ownership of hospital: The type of organization that controls and operates the hospital. Hospitals are 
  grouped as follows:

  • Not for Profit: Hospitals operated by a church or another not for profit organization.
  • Government: Hospitals operated by State and local government.
  • Proprietary: Hospitals operated by individuals, partnerships, or corporations for profit.
  • Patient: A person who is formally admitted to the inpatient service of a short-stay hospital for observation, care, diagnosis, or treatment, or by birth.

  Discharge: The formal release of a patient by a hospital; that is, the termination of a period of hospitalization by 
  death or by disposition to place of residence, nursing home, or another hospital. The terms "discharges" and 
  "patients discharged" are used synonymously.

  Discharge rate: The ratio of the number of hospital discharges during the year to the number of persons in the 
  civilian population on July 1 of that year.

  Days of care: The total number of patient days accumulated at time of discharge by patients discharged from 
  short: stay hospitals during a year. A stay of less than 1 day (patient admission and discharge on the same day) 
  is counted as 1 day in the summation of total days of care. For patients admitted and discharged on different 
  days, the number of days of care is computed by counting all days from (and including) the date of admission 
  to (but not including) the date of discharge.

  Rate of days of care: The ratio of the number of patient days accumulated at time of discharge to the number 
  of  persons in the civilian population on July 1 of that year.

  Average length of stay: The total number of days of care accumulated at time of discharge by patients 
  discharged during the year, divided by the number of patients discharged.


  Terms relating to diagnoses and procedures

  Discharge diagnoses: One or more diseases or injuries (or some factor that influences health status and contact 
  with health services that is not itself a current illness or injury) listed by the attending physician on the medical 
  record of a patient. In the NHDS, discharge (or final) diagnoses listed on the face sheet (summary sheet) of   
  the medical record are transcribed in the order listed. Each sample discharge is assigned a maximum of seven 
  five-digit codes according to ICD-9-CM (2).

  Principal diagnosis: The condition established after study to be chiefly responsible for occasioning the 
  admission of the patient to the hospital for care.

  First-listed diagnosis: The coded diagnosis identified as the principal diagnosis or listed first on the face sheet 
  of  the medical record if the principal diagnosis cannot be identified. The number of first-listed diagnoses is 
  equivalent to the number of discharges.

  Procedure: One or more surgical or nonsurgical operations, procedures, or special treatments listed by the 
  physician on the medical record. In the NHDS, all terms listed on the face sheet (summary sheet) of the 
  medical record under the caption "operation," "operative procedures," "operations and/or special treatment," 
  and the like are transcribed in the order listed. A maximum of four procedures are coded.

  Rate of procedures: The ratio of the number of all-listed procedures during a year to the number of persons in 
  the civilian population on July 1 of that year determines the rate of procedures.


Demographic terms

  Age: Refers to the age of the patient on the birthday prior to admission to the hospital inpatient service.

  Population: Civilian population is the resident population excluding members of the Armed Forces.

  Geographic regions: Hospitals are classified by location in one of the four geographic regions of the United 
  States corresponding to those used by the U.S. Bureau of the Census:


  U.S. CENSUS REGIONS

NORTHEAST MIDWEST SOUTH WEST
       
Maine Michigan Delaware Montana
New Hampshire Ohio Maryland Idaho
Vermont Illinois District of Columbia Wyoming
Massachusetts Indiana Virginia Colorado
Connecticut Wisconsin West Virginia New Mexico
Rhode Island Minnesota North Carolina Arizona
New York Iowa South Carolina Utah
New Jersey Missouri Georgia Nevada
Pennsylvania North Dakota Florida Washington
  South Dakota Kentucky Oregon
  Nebraska Tennessee California
  Kansas Alabama Hawaii
    Mississippi Alaska
    Arkansas  
    Louisana  
    Oklahoma  
    Texas  



 Appendix B

  The International Classification of Diseases, 9th Revision, Clinical Modification, which has been used 
  for coding NHDS data since 1979, undergoes annual updating. Assignment of new diagnostic and procedure 
  codes, fourth and fifth digit expansion of codes, as well as code deletions, are contained in addenda developed 
  by the ICD-9-CM Coordination and Maintenance Committee and approved by the Director of NCHS and the 
  Administrator of the Health Care Financing Administration. Addenda to the ICD-9-CM become effective on 
  October 1 of the calendar year and have been released for 1986 through 1997.

  As described earlier in this document, the 1997 NHDS involved two data collection modes: manual and 
  abstract service. All data collected manually were coded using the third edition of the ICD-9-CM, which   
  includes the addenda for 1986 through 1996. Data collected via abstract service were coded using two 
  different ICD-9-CM revisions. For the first 9 months of 1997, the ICD-9-CM including the addendum of 
  October 1, 1986-96 was used; for the last 3 months the October 1997 addendum was used. Therefore, data 
  provided by automated systems for the last three months of 1997 was converted back to the code assignment 
  under the October 1996 addendum. This was done in order to prevent NHDS data users from mistaking 
  partial year estimates for annual estimates.

  In order to assist users in data retrieval, a conversion table is provided that shows the date of introduction of 
  each new code and the previously assigned code equivalent, which had been used for reporting the selected 
  diagnosis or procedure prior to issuance of the new code.

DIAGNOSIS CODES    
     
  Effective  
Current code(s) assignment October 1 Previous code(s) assignment
     
005.81 1995 005.8
005.89 1995 005.8
     
008.00-008.09 1992 008.0
008.43-008.47 1992 008.49
008.61-008.69 1992 008.6
     
041.00-041.09 1992 041.0
041.10-041.19 1992 041.1
041.81-041.85 1992 041.8
     
041.86 1995 041.84
041.89 1992 041.8
     
042 1994 042.0-042.2, 042.9, 043.0-043.3,
    043.9, 044.0, 044.9 (Codes delted)
     
042.0-042.9 1986 279.19
043.0-043.9 1986 279.19
044.0-044.9 1986 279.19
     
070.20-070.21 1991 070.2
     
070.22 1994 070.20
070.23 1994 070.21
     
070.30-070.31 1991 070.3
     
070.32 1994 070.30
070.33 1994 070.31
070.41-070.43 1991 070.4
070.44 1994 070.41
070.49 1991 070.4
070.51-070.53 1991 070.5
070.54 1994 070.51
070.59 1991 070.5
     
077.98-077.99 1993 077.9
     
078.10-078.11,078.19 1993 078.1
078.88 1993 078.89
     
079.4 1993 079.8
079.50-079.53,079.59 1993 079.8
     
079.6 1996 079.89
     
079.81 1995 079.89
079.88-079.89 1993 079.8
079.98-079.99 1993 079.9
     
088.81,088.89 1989 088.8
088.82 1993 088.89
     
099.40-099.49 1992 099.4
099.50-099.59 1992 078.89
     
112.84-112.85 1992 112.89
     
114.4-114.5 1993 114.3
     
176.0-176.9 1991 173.0-173.9
     
203.00 1991 203.0
203.01 1991 V10.79
203.10 1991 203.1
203.11 1991 V10.79
203.80 1991 203.8
203.81 1991 V10.79
     
204.00 1991 204.0
204.01 1991 V10.61
204.10 1991 204.1
204.11 1991 V10.61
204.20 1991 204.2
204.21 1991 V10.61
204.80 1991 204.8
204.81 1991 V10.61
204.90 1991 204.9
204.91 1991 V10.61
     
205.00 1991 205.0
205.01 1991 V10.62
205.10 1991 205.1
205.11 1991 V10.62
205.20 1991 205.2
205.21 1991 V10.62
205.30 1991 205.3
205.31 1991 V10.62
205.80 1991 205.8
205.81 1991 V10.62
205.90 1991 205.9
205.91 1991 V10.62
     
206.00 1991 206.0
206.01 1991 V10.63
206.10 1991 206.1
206.11 1991 V10.63
206.20 1991 206.2
206.21 1991 V10.63
206.80 1991 206.8
206.81 1991 V10.63
206.90 1991 206.9
206.91 1991 V10.63
     
207.00 1991 207.0
207.01 1991 V10.69
207.10 1991 207.1
207.11 1991 V10.69
207.20 1991 207.2
207.21 1991 V10.69
207.80 1991 207.8
207.81 1991 V10.69
     
208.00 1991 208.0
208.01 1991 V10.60
208.10 1991 208.1
208.11 1991 V10.60
208.20 1991 208.2
208.21 1991 V10.60
208.80 1991 208.8
208.81 1991 V10.60
208.90 1991 208.9
208.91 1991 V10.60
     
237.70-237.72 1990 237.7
     
250.02 1993 250.90
250.03 1993 250.91
250.12 1993 250.10
250.13 1993 250.11
250.22 1993 250.20
250.23 1993 250.21
250.32 1993 250.30
250.33 1993 250.31
250.42 1993 250.40
250.43 1993 250.41
250.52 1993 250.50
250.53 1993 250.51
250.62 1993 250.60
250.63 1993 250.61
250.72 1993 250.70
250.73 1993 250.71
250.82 1993 250.80
250.83 1993 250.81
250.92 1993 250.90
250.93 1993 250.91
     
278.00-278.01 1995 278.0
     
283.10-283.11,283.19 1993 283.1
     
291.81 1996 291.8
291.89 1996 291.8
     
293.84 1996 293.89
     
300.82 1996 300.81
     
305.1 1994 305.10, 305.11, 305.12,
    305.13 (Codes deleted)
     
312.81-312.82,312.89 1994 312.8
     
315.32 1996 315.39
     
320.81-320.89 1992 320.8
     
333.92-333.93 1994 333.99
     
337.20-337.22,337.29 1993 337.9
 
342.00-342.02 1994 342.0
342.10-342.12 1994 342.1
342.80-342.82 1994 342.9
342.90-342.92 1994 342.9
     
344.00-344.04,344.09 1994 344.0
344.30-344.32 1994 344.3
344.40-344.42 1994 344.4
344.81,344.89 1993 344.8
     
345.00-345.01 1989 345.0
345.10-345.11 1989 345.1
345.40-345.41 1989 345.4
345.50-345.51 1989 345.5
345.60-345.61 1989 345.6
345.70-345.71 1989 345.7
345.80-345.81 1989 345.8
345.90-345.91 1989 345.9
     
346.00-346.01 1992 346.0
346.10-346.11 1992 346.1
346.20-346.21 1992 346.2
346.80-346.81 1992 346.8
346.90-346.91 1992 346.9
     
355.71 1993 354.4
355.79 1993 355.7
     
371.82 1992 371.89
     
374.87 1990 374.89
     
403.00-403.01 1989 403.0
403.10-403.11 1989 403.1
403.90-403.91 1989 403.9
     
404.00-404.03 1989 404.0
404.10-404.13 1989 404.1
404.90-404.93 1989 404.9
     
410.00-410.02 1989 410.0
410.10-410.12 1989 410.1
410.20-410.22 1989 410.2
410.30-410.32 1989 410.3
410.40-410.42 1989 410.4
410.50-410.52 1989 410.5
410.60-410.62 1989 410.6
410.70-410.72 1989 410.7
410.80-410.82 1989 410.8
410.90-410.92 1989 410.9
     
411.81 1989 410.9
411.89 1989 411.8
     
414.00-414.01 1994 414.0
414.02-414.03 1994 996.03
     
414.04-414.05 1996 414.00
     
415.11 1995 997.3 & 415.1
415.19 1995 415.1
     
429.71 1989 410.0-410.9
429.79 1989 410.0-410.9
     
433.00-433.01 1993 433.0
433.10-433.11 1993 433.1
433.20-433.21 1993 433.2
433.30-433.31 1993 433.3
433.80-433.81 1993 433.8
433.90-433.91 1993 433.9
     
434.00-434.01 1993 434.0
434.10-434.11 1993 434.1
434.90-434.91 1993 434.9
     
435.3 1995 435.0 & 435.1
     
437.7 1992 780.9
     
440.20-440.22 1992 440.2
440.23 1993 440.20 & 707.1 or 707.8 or 707.9
440.24 1993 440.20 & 785.4
440.29 1993 440.2
440.30-440.32 1994 996.1
     
441.00-441.03 1994 441.0
441.6 1993 441.1 & 441.3
441.7 1993 441.2 & 441.4
     
446.20-446.21,446.29 1990 446.2
     
451.82-451.84 1993 451.89
     
458.2 1995 997.9 & 458.9
     
466.11 1996 466.1
466.19 1996 466.1
     
482.30-482.39 1992 482.3
482.81-482.89 1992 482.8
     
483.0 1992 483
483.1 1996 078.88 & 484.8
     
483.8 1992 483
     
491.20-491.21 1991 491.2
     
493.20 1989 493.90
493.21 1989 493.91
     
512.1 1994 997.3
     
518.81 1987 799.1
518.82-518.89 1987 518.8
     
524.00-524.09 1992 524.0
524.10-524.19 1992 524.1
524.60-524.69 1991 524.6
524.70-524.79 1992 524.8
     
530.10-530.11, 530.19 1993 530.1
530.81 1993 530.1
530.82-530.84, 530.89 1993 530.8
     
535.00-535.01 1991 535.0
535.10-535.11 1991 535.1
535.20-535.21 1991 535.2
535.30-535.31 1991 535.3
535.40-535.41 1991 535.4
535.50-535.51 1991 535.5
535.60-535.61 1991 535.6
     
536.3 1994 536.8
     
537.82 1990 537.89
537.83 1991 537.82
     
556.0-556.6 1994 556
556.8-556.9 1994 556
     
562.02 1991 562.00
562.03 1991 562.01
562.12 1991 562.10
562.13 1991 562.11
     
569.60-569.61 1995 569.6
569.69 1995 569.6
569.84 1990 557.1
569.85 1991 569.84
     
574.60 1996 574.00 & 574.30
574.61 1996 574.01 & 574.31
574.70 1996 574.10 & 574.40
574.71 1996 574.11 & 574.41
574.80 1996 574.00 & 574.10
    574.30 & 574.40
574.81 1996 574.01 & 574.11
    574.31 & 574.41
574.90 1996 574.20 & 574.50
574.91 1996 574.21 & 574.51
     
575.10-575.11 1996 575.1
575.12 1996 575.0 & 575.1
     
593.70-593.73 1994 593.7
     
596.51-596.53 1992 596.5
596.54 1992 344.61
596.55-596.59 1992 596.5
     
599.81-599.89 1992 599.8
     
645.0 1991 645
     
651.30-651.31,651.33 1989 651.00-651.01,651.03
651.40-651.41,651.43 1989 651.10-651.11,651.13
651.50-651.51,651.53 1989 651.20-651.21,651.23
651.60-651.61,651.63 1989 651.80-651.81,651.83
     
654.20-654.21,654.23 1990 654.2, 654.9
654.90-651.94 1990 654.2, 654.9
     
657.0 1991 657
     
659.60,659.61,659.63 1992 659.80-659.81, 659.83
     
665.10,665.11 1992 665.10,665.11,665.12,665.14
Note: The title for the subcategory, 665.1 has been changed,
making the fifth-digit subclassification, 665.12 and 665.14
invalid.    
     
670.0 1991 670
     
672.0 1991 672
     
677 1994 * No previous code assignment.
     
690.10 1995 690
690.11 1995 691.8 & 704.8
690.12 1995 691.8
690.18 1995 690
690.8 1995 690
     
692.72-692.74 1992 692.79
692.82-692.83 1992 692.89
     
702.0-702.8 1991 702
     
702.11,702.19 1994 702.1
     
704.02 1993 704.09
     
709.00-709.01,709.09 1994 709.0
     
710.5 1992 288.3,729.1
     
728.86 1995 729.4
     
733.10-733.16, 733.19 1993 733.1
     
738.10-738.19 1992 738.1
     
747.60-747.64, 747.69 1993 747.6
747.82 1993 747.89
     
752.51-752.52 1996 752.5
752.61-752.63 1996 752.6
752.64-752.65 1996 752.8
752.69 1996 752.8
     
753.10-753.17,753.19 1990 753.1
     
753.20-753.23 1996 753.2
753.29 1996 753.2
758.81 1996 758.8
758.89 1996 758.9
     
759.81-759.82 1989 759.8
759.83 1994 759.89
759.89 1989 759.8
     
760.75 1991 760.79
760.76 1994 760.79
     
764.00-764.09 1988 764.0
764.10-764.19 1988 764.1
764.20-764.29 1988 764.2
764.90-764.99 1988 764.9
     
765.00-765.09 1988 765.0
765.10-765.19 1988 765.1
     
780.01-780.02 1992 780.0
780.03 1993 780.01
780.09 1992 780.0
780.57 1992 780.51, 780.53
     
781.8 1994 781.9
     
787.01-787.03 1994 787.0
787.91 1995 558.9
787.99 1995 787.9
     
788.20-788.21, 788.29 1993 788.2
788.30-788.39 1992 788.3
788.41-788.43 1993 788.4
788.61-788.62, 788.69 1993 788.6
     
789.00-789.07, 789.09 1994 789.0
789.30-789.37, 789.39 1994 789.3
789.40-789.47, 789.49 1994 789.4
789.60-789.67, 789.69 1994 789.6
     
790.91 1993 790.9
790.92 1993 286.9
790.93, 790.99 1993 790.9
     
795.71 1994 795.8 (Code deleted)
795.79 1994 795.7
795.8 1986 795.7
     
864.05 1992 864.09
864.15 1992 864.19
     
909.5 1994 909.9
     
922.31-922.33 1996 922.3
     
925.1-925.2 1993 925
     
989.81-989.84 1995 989.8
989.89 1995 989.8
     
995.50-995.55 1996 995.5
995.59 1996 995.5
     
995.60-995.69 1993 995.0
     
995.80 1996 995.81
995.81 (Code title restated) 1996 995.81
995.82-995.85 1996 995.81
     
996.04 1994 996.09
996.51-996.59 1987 996.5
996.60-996.69 1989 996.6
996.70-996.79 1989 996.7
996.80-996.84 1987 996.8
996.85 1990 996.8
996.86 1987 996.8
996.89 1987 996.8
     
997.00-997.01 1995 997.0
997.02 1995 997.9 & 430-434, 436
997.09 1995 997.0
997.91 1995 997.9
997.99 1995 997.9
     
998.11-998.12 1996 998.1
998.13 1996 998.89
998.51 1996 998.5
998.59 1996 998.5
998.81-998.82, 998.89 1994 998.8
998.83 1996 998.89
     
V03.81-V03.82, V03.89 1994 V03.8
     
V05.3-V05.4 1993 V05.8
     
V06.5-V06.6 1994 V06.8
     
V07.31,V07.39 1994 V07.3
V07.4 1992 V07.8
     
V08 1994 044.9, 795.8 (Codes deleted)
     
V09.0-V09.91 1993 * No previous code assignments.
     
V12.00-V12.03, V12.09 1994 V12.0
V12.50-V12.52 1995 V12.5
V12.59 1995 V12.5
V12.70-V12.72, V12.79 1994 V12.7
     
V13.00-V13.01, V13.09 1994 V13.0
     
V15.41-V15.42 1996 V15.4
V15.49 1996 V15.4
     
V15.82 1994 305.13 (Codes deleted)
V15.84-V15.86 1995 V15.89
     
V23.7 1989 V23.8
     
V25.43 1992 V25.49
V25.5 1992 V25.8
     
V29.0-V29.1, V29.8 1992 V71.8
V29.2 1994 V29.8
  (Note: Codes V29.3-V29.7 have not been assigned yet.)  
V29.9 1992 V71.9
     
V30.00-V30.01 1989 V30.0
V31.00-V31.01 1989 V31.0
V32.00-V32.01 1989 V32.0
V33.00-V33.01 1989 V33.0
V34.00-V34.01 1989 V34.0
V35.00-V35.01 1989 V35.0
V36.00-V36.01 1989 V36.0
V37.00-V37.01 1989 V37.0
V39.00-V39.0l 1989 V39.0
     
V43.60-V43.66, V43.69 1994 V43.6
V43.81-V43.82 1995 V43.8
V43.89 1995 V43.8
     
V45.00 1994 V45.89
V45.01 1994 V45.0
V45.02, V45.09 1994 V45.89
V45.51 1994 V45.5
V45.52, V45.59 1994 V45.89
V45.82 1994 V45.89
V45.83 1995 V45.89
     
V49.60-V49.67 1994 V49.5
V49.70-V49.77 1994 V49.5
     
V50.41-V50.42, V50.49 1994 V50.8
     
V53.31 1994 V53.3
V53.32, V53.39 1994 V53.9
     
V56.1 1995 V58.89
     
V57.21-V57.22 1994 V57.2
     
V58.41, V58.49 1994 V58.4
V58.61 1995 V67.51
V58.69 1995 V67.51
V58.81, V58.89 1994 V58.8
V58.82 1995 V58.89
     
V59.01-V59.02 1995 V59.0
V59.09 1995 V59.0
V59.6 1995 V59.8
     
V61.10-V61.12 1996 V61.1
V61.22 1996 V61.21
     
V62.83 1996 V65.49
     
V65.40-V65.45, V65.49 1994 V65.4
     
V66.7 1996 No previous code assignment.
     
V69.0-V69.3 1994 * No previous code assignments.
V69.8-V69.9 1994 * No previous code assignments.
     
V72.81-V72.85 1993 V72.8
     
V73.88-V73.89 1993 V73.8
V73.98-V73.99 1993 V73.9
     
E854.8 1995 E858.8
     
E869.4 1994 E869.8
     
E880.1 1995 E884.9
E884.3-E884.4 1995 E884.2
E884.5-E884.6 1995 E884.9
     
E906.5 1995 E906.3
E908.0-E908.4 1995 E908
E908.8-E908.9 1995 E908
E909.0-E909.4 1995 E909
E909.8-E909.9 1995 E909
E920.5 1995 E920.4
E924.2 1995 E924.0
     
E967.2 1996 E967.0
E967.3 1996 No previous code assighnment.
E967.4-E967.8 1996 E967.1
E968.5 1995 E968.8


PROCEDURE CODES    
     
  Effective  
Current code(s) assignment October 1 Previous code(s) assignment
     
02.96 1992 89.19
     
03.90 1987 03.99 (Insertion of Catheter)
     
05.25 1995 39.7
     
11.75 1989 11.79
11.76 1989 11.62
     
20.96-20.98 1986 20.95
     
22.12 1988 22.11
     
26.12 1988 26.11
     
29.31 1991 83.02
29.32 1991 29.3
29.33 1991 29.3
29.39 1991 29.3
     
31.45 1988 31.43-31.44
31.95 1989 31.75
     
32.01 1989 32.0
32.09 1989 32.0
32.22 1995 32.29, 32.9
32.28 1989 32.29
     
33.27 1987 33.22 + 33.27
33.28 1987 33.27
33.29 1987 33.28-33.29
33.50 1995 33.5
33.51 1995 33.5
33.52 1995 33.5
33.6 1990 33.5 + 37.5
     
34.05 1994 34.99
     
35.84 1988 35.82
35.96 1986 35.03
     
36.00-36.03 1986 36.0
36.04 1986 39.97
36.05 1987 36.01
36.05 1986 36.01 1/, 36.02
36.06 1995 36.01, 36.02, 36.03, 36.05
36.09 1986 36.0
36.09 1991 36.00 (Code deleted)
     
36.17 1996 36.19
     
37.26-37.27 1988 37.29
37.34 1988 37.33
37.65 1995 37.62
37.66 1995 37.62
     
37.70 (Leads only) 1987 37.70 (Leads/Device)
37.71-37.72 (Leads only) 1987 37.74 (Leads/Device)
37.73 (Leads only) 1987 37.73 (Leads/Device)
37.74 (Leads only) 1987 37.76 (Leads/Device)
37.75 (Leads only) 1987 37.89 (Leads/Device)
37.76 (Leads only) 1987 37.81 (Leads/Device)
37.77 (Leads only) 1987 37.83-37.84 (Leads/Device)
37.78 1987 37.71-37.72
37.79 1987 86.09
37.80-37.87 1992 89.49 (Code deleted, this procedure is included in the code for pacemaker insertion/replacement)
     
37.80 (Device only) 1987 37.73-37.77 (Leads/Device)
37.81 (Device only) 1987 37.73-37.77 (Leads/Device)
37.82 (Device only) 1987 37.73-37.77 (Leads/Device)
37.83 (Device only) 1987 37.73-37.77 (Leads/Device)
37.85-37.87 1987 37.85
37.89 1987 37.86 + 37.89
37.94-37.98 1986 37.99
     
38.22 1986 38.29
38.44 (Abdominal Aorta Only) 1986 38.44 (Entire Aorta)
38.45 (Thoracic Aorta Added) 1986 38.44-38.45
38.95 1989 38.93
     
39.28 1991 39.29
39.50 1995 39.59
39.65 1988 39.61
39.66 1990 39.65
     
39.90 1996 39.50
     
41.00-41.03 1988 41.0
41.04 1994 99.79
     
42.25 1988 42.24
42.33 1989 42.32, 42.39
42.33 1990 42.91
     
43.11 1989 43.1
43.19 1989 43.1, 43.2
43.41 1989 43.41,43.49
     
44.21 1986 44.2
44.22 1986 44.99
44.29 1986 44.2
44.43 1989 43.49,45.32
44.44 1989 38.86
44.49 1989 43.0
44.93-44.94 1986 44.99
     
45.16 1988 45.14 (45.15 before 1987)
45.30 1989 45.31,45.32
45.42 1988 45.41
45.43 1989 45.49
45.75 (Hartmann Resection Added) 1988 48.66 (Code deleted)
45.95 1987 45.93
     
46.13 1992 46.12 (Code deleted)
46.32 1989 46.39
46.85 1989 46.99
     
47.01 1996 47.0
47.09 1996 47.0
47.11 1996 47.1
47.19 1996 47.1
     
48.36 1995 45.42
     
49.31 1989 49.3
49.39 1989 49.3
     
51.10 1989 51.97
51.11 1989 51.11,51.97
51.14 1989 51.12
51.15 1989 51.97
     
51.21 1996 51.22, 51.23
     
51.22 1991 51.21 (Code deleted),51.22
51.23 1991 51.22
     
51.24 1996 51.22, 51.23
     
51.64 1989 51.69
51.84-51.88 1989 51.97
51.97 1986 52.91,51.99, or 51.82
51.98 1986 51.99
     
52.13 1989 51.97,52.91
52.14 1989 52.11
52.21 1989 52.2
52.22 1989 52.2
     
52.84 1996 99.29
52.85 1996 99.29
52.86 1996 99.29
     
52.93 1989 52.93 + 52.91
52.94 1989 52.09
52.97 1989 52.91
52.98 1989 52.91
52.99 1989 52.93,52.94,52.99
     
54.24 1987 54.23
54.25 1993 54.98
     
54.51 1996 54.5
54.59 1996 54.5
     
55.03-55.04 1986 55.02
     
56.33-56.34 1987 56.33
56.35 1987 45.12
     
57.17-57.18 1989 57.21
57.22 1989 57.22,57.82
     
58.31 1990 58.3
58.39 1990 58.3
58.93 1986 57.99
     
59.03 1996 59.02
59.12 1996 59.11
     
59.72 1995 59.79
59.96 1986 59.95
     
60.21 1995 60.2
60.29 1995 60.2
60.95 1991 60.99
     
64.97 1986 64.95
     
65.01 1996 65.0
65.09 1996 65.0
65.13 1996 65.12
65.14 1996 65.19
65.23 1996 65.21
65.24 1996 65.22
65.25 1996 65.29
65.31 1996 65.3
65.39 1996 65.3
65.41 1996 65.4
65.49 1996 65.4
65.53 1996 65.51
65.54 1996 65.52
65.63 1996 65.61
65.64 1996 65.62
65.74 1996 65.71
65.75 1996 65.72
65.76 1996 65.73
65.81 1996 65.8
65.89 1996 65.8
     
66.01 1992 66.0
66.02 1992 66.73
     
68.15 1987 68.14
68.16 1987 68.13
     
68.23 1996 68.29
68.51 1996 68.5
68.59 1996 68.5
     
68.9 1992 68.4
     
74.3 1992 69.11 (Code deleted)
     
77.56 1989 77.89,78.49,81.18
77.57 1989 77.89,80.48,81.18,83.85
77.58 1989 77.59,81.18
     
78.10 1991 78.40
78.11 1991 78.41
78.12 1991 78.42
78.13 1991 78.43
78.14 1991 78.44
78.15 1991 78.45
78.16 1991 78.46
78.17 1991 78.47
78.18 1991 78.48
78.19 1991 78.49
78.20 1991 78.10,78.20,78.30
78.21 (Invalid code) 1991 78.11,78.31
78.22 1991 78.12,78.22,78.32
78.23 1991 78.13,78.23,78.33
78.24 1991 78.14,78.34
78.25 1991 78.15,78.25,78.35
78.27 1991 78.17,78.27,78.37
78.28 1991 78.18,78.38
78.29 1991 78.11,78.16,78.19,78.29,78.39
78.39 1991 78.31
     
78.90 2/ 1987 78.40
78.91 2/ 1987 78.41
78.92 2/ 1987 78.42
78.93 2/ 1987 78.43
78.94 2/ 1987 78.44
78.95 2/ 1987 78.45
78.96 2/ 1987 78.46
78.97 2/ 1987 78.47
78.98 2/ 1987 78.48
78.99 2/ 1987 78.49
     
80.50-80.59 1986 80.5
     
81.03 1989 81.02
81.04-81.05 1989 81.03,81.04,81.05
81.06-81.07 1989 81.06,81.07
81.08 1989 81.06,81.07,81.08
81.09 1989 81.08
81.40 1989 81.69
81.51 1989 81.51,81.59
81.52 1989 81.61,81.62,81.63,81.64
81.53 1989 81.51,81.59,81.61,81.62,
    81.63,81.64
81.54-81.55 1989 81.41 (Code deleted)
81.56 1989 81.48
81.57 1989 81.31,81.39
81.59 1989 81.39
81.72 1989 81.79
81.73-81.74 1989 81.86 (Code deleted)
81.75 1989 81.87 (Code deleted)
81.79 1989 81.79,81.87
81.80 1989 81.81
81.97 1992 81.59
     
85.95 1987 85.99
85.96 1987 85.99
     
86.06 1987 86.09
86.07 1990 86.09
86.27 1986 86.22-86.23
86.28 1988 86.22
86.93 1987 86.89
     
88.90 1986 88.39
88.91 1986 89.15
88.92 1986 89.39
88.93 1986 89.15
88.94 1986 89.39
88.95 1986 89.29
88.97 1989 88.99
88.98 1989 88.90
88.99 1986 89.39
     
89.10 1989 89.15
89.17-89.18 1988 89.15
89.19 1989 89.15
89.50 1991 89.54
     
92.3 1995 01.59, 04.07, 07.63, 07.68
     
93.90 1988 93.92
     
94.61-94.69 1989 94.25
     
96.6 1986 96.35
96.70 1991 93.92 (Code deleted)
96.71 1991 93.92 (Code deleted)
96.72 1991 93.92 (Code deleted)
     
97.05 1989 51.97
     
98.51-98.52 1989 59.96 (Code deleted)
98.59 1989 59.96 (Code deleted)
     
99.00 1995 99.02
99.15 1986 99.29
99.28 1994 99.25
99.71-99.74, 99.79 3/ 1988 99.07
99.85 1987 93.35
99.86 1987 93.39
99.88 1988 99.83
     

1/ Before October 1986 contents of current code 36.05 would have been assigned to 36.0

2/ Codes 78.90-78.99 were retitled as "Insertion of bone growth stimulator" in October 1987; the previous contents of codes 78.90-78.99 were reassigned to codes 78.40-78.49.

3/ Codes 99.71-99.79 were deleted in October 1987; their contents were not transferred elsewhere. In the October 1988 revision, codes 99.71-99.79 were reclassified as "Therapeutic apheresis." Codes 99.75-99.78 have not yet been reassigned.



Appendix C

Adjusted Civilian Population* by Sex, Age, Geographic Region and Race
United States, July 1, 1997

[Population estimates consistent with Series P-25,
Current Population Reports, U.S. Bureau of the Census]

  Both sexes Male Female
       
All ages 270,430 132,332 138,098
       
Northeast 51,968 25,191 26,777
Midwest 62,784 30,693 32,091
South 95,320 46,274 49,046
West 60,358 30,175 30,183
       
White 222,696 109,496 113,200
Black 35,143 16,682 18,460
All other 12,591 6,154 6,437
       
Under 15 years 59,749 30,588 29,161
Under 1 year 3,943 2,017 1,926
1-4 years 15,882 8,128 7,754
5-14 years 39,924 20,443 19,481
       
Northeast 10,804 5,533 5,271
Midwest 13,651 6,992 6,658
South 21,051 10,766 10,285
West 14,243 7,298 6,946
       
White 46,915 24,067 22,848
Black 9,614 4,878 4,736
All other 3,220 1,644 1,576
       
15-44 years 121,641 60,996 60,645
15-24 years 37,256 19,012 18,244
25-34 years 40,167 20,012 20,155
35-44 years 44,218 21,972 22,246
       
Northeast 23,057 11,502 11,555
Midwest 28,135 14,114 14,021
South 42,723 21,161 21,562
West 27,726 14,219 13,507
       
White 98,461 49,809 48,652
Black 16,923 8,104 8,820
All other 6,256 3,083 3,173
       
45-64 years 55,265 26,810 28,455
45-54 years 33,643 16,484 17,159
55-64 years 21,622 10,326 11,296
       
Northeast 10,903 5,245 5,658
Midwest 12,949 6,303 6,646
South 19,699 9,476 10,223
West 11,715 5,787 5,928
       
White 47,186 23,139 24,046
Black 5,823 2,610 3,213
All other 2,256 1,062 1,195
       
65 years and over 33,775 13,938 19,837
65-74 years 18,324 8,218 10,106
75-84 years 11,606 4,610 6,996
85 years and over 3,845 1,109 2,736
       
Northeast 7,203 2,911 4,292
Midwest 8,050 3,283 4,766
South 11,848 4,872 6,976
West 6,674 2,871 3,802
       
White 30,135 12,481 17,653
Black 2,782 1,091 1,691
All other 858 365 493

*The NHDS used the civilian noninstitutional population to calculate hospital utilization rates from 1965 through 1980. Beginning in 1981, the civilian resident population has been used to calculate rates. If you have purchased NHDS tapes for years before 1981 and calculated rates using the civilian noninstitutionalized population provided in the documentation, these rates will have to be adjusted to be comparable to 1997 rates using the civilian resident population.

 

Adjusted Civilian Population of the United States, July 1, 1997. Estimates by Age, Sex, and Region.

   Source: U.S. Bureau of the Census, Population Division Release PPL91R


United States Northeast Midwest South West

Age Total Male Female Total Male Female Total Male Female Total Male Female Total Male Female


Adjusted Civilian Population in Thousands

All ages 270,430 132,332 138,098 51,968 25,191 26,777 62,784 30,693 32,091 95,320 46,274 49,046 60,358 30,175 30,183
                               
0-4 19,825 10,145 9,680 3,545 1,815 1,730 4,397 2,250 2,147 7,014 3,587 3,427 4,869 2,493 2,377
5-9 20,346 10,413 9,933 3,739 1,916 1,823 4,604 2,358 2,246 7,119 3,637 3,481 4,884 2,501 2,383
10-14 19,579 10,030 9,548 3,520 1,802 1,719 4,650 2,384 2,266 6,919 3,541 3,377 4,490 2,303 2,186
15-19 19,484 10,012 9,472 3,397 1,745 1,653 4,702 2,413 2,289 6,964 3,555 3,409 4,421 2,299 2,121
20-24 17,771 9,000 8,772 3,139 1,598 1,541 4,115 2,081 2,034 6,389 3,161 3,228 4,129 2,160 1,969
25-29 19,256 9,596 9,661 3,697 1,849 1,847 4,317 2,141 2,176 6,779 3,310 3,469 4,464 2,295 2,169
30-34 20,911 10,416 10,495 4,161 2,052 2,109 4,695 2,336 2,359 7,257 3,579 3,677 4,798 2,449 2,349
35-39 22,725 11,315 11,410 4,488 2,217 2,271 5,272 2,637 2,635 7,856 3,870 3,986 5,110 2,592 2,518
40-44 21,493 10,657 10,836 4,175 2,041 2,135 5,034 2,506 2,529 7,478 3,686 3,792 4,805 2,424 2,381
45-49 18,581 9,138 9,444 3,638 1,758 1,880 4,350 2,143 2,207 6,505 3,189 3,315 4,088 2,047 2,041
50-54 15,061 7,346 7,715 3,001 1,453 1,548 3,484 1,700 1,783 5,346 2,587 2,759 3,231 1,606 1,625
55-59 11,665 5,615 6,050 2,304 1,106 1,198 2,757 1,331 1,426 4,196 1,996 2,199 2,409 1,182 1,227
60-64 9,957 4,712 5,246 1,960 928 1,032 2,358 1,128 1,229 3,652 1,703 1,949 1,987 952 1,035
65-69 9,666 4,432 5,235 2,005 910 1,095 2,243 1,029 1,214 3,490 1,589 1,901 1,929 904 1,024
70-74 8,657 3,786 4,871 1,829 789 1,040 2,026 891 1,135 3,076 1,335 1,740 1,727 771 956
75-79 7,003 2,903 4,100 1,512 614 898 1,655 676 980 2,438 1,005 1,433 1,398 609 789
80-84 4,603 1,707 2,896 1,004 363 641 1,141 414 727 1,560 573 987 898 358 540
85+ 3,845 1,109 2,736 854 236 617 984 273 710 1,285 370 915 722 230 492
                               
0-14 59,749 30,588 29,161 10,804 5,533 5,271 13,651 6,992 6,658 21,051 10,766 10,285 14,243 7,298 6,946
15-44 121,641 60,996 60,645 23,057 11,502 11,555 28,135 14,114 14,021 42,723 21,161 21,562 27,726 14,219 13,507
45-64 55,265 26,810 28,455 10,903 5,245 5,658 ERR 6,303 6,646 19,699 9,476 10,223 11,715 5,787 5,928
                               
15+ 210,681 101,744 108,937 41,164 19,658 21,506 49,134 23,700 25,433 74,269 35,508 38,761 46,115 22,877 23,237
45+ 89,040 40,748 48,292 18,106 8,156 9,951 20,998 9,586 11,412 31,547 14,348 17,199 18,389 8,659 9,730
65+ 33,775 13,938 19,837 7,203 2,911 4,292 8,050 3,283 4,766 11,848 4,872 6,976 6,674 2,871 3,802
75+ 15,451 5,720 9,731 3,369 1,213 2,157 3,781 1,363 2,417 5,283 1,947 3,335 3,018 1,196 1,822

 

Adjusted Civilian Population of the United States, July 1, 1997.

Source: U.S. Bureau of the Census. Population Division Release PPL91R.


All races White Black Other races

Age Total Male Female Total Male Female Total Male Female Total Male Female


Adjusted Civilian population in thousands

All Ages 270,430 132,332 138,098 222,696 109,496 113,200 35,143 16,682 18,460 12,591 6,154 6,437
                         
0-4 19,825 10,145 9,680 15,587 7,995 7,592 3,124 1,584 1,540 1,114 566 548
0 3,943 2,017 1,926 3,108 1,593 1,514 606 307 299 230 116 113
1 3,910 1,999 1,911 3,090 1,583 1,507 598 303 295 222 113 109
2 3,927 2,010 1,917 3,095 1,588 1,507 613 311 302 219 111 108
3 3,967 2,030 1,937 3,111 1,596 1,515 635 322 313 222 113 109
4 4,077 2,088 1,988 3,183 1,634 1,549 672 341 331 222 113 108
                         
5-9 20,346 10,413 9,933 15,922 8,162 7,759 3,357 1,703 1,654 1,067 548 519
5 4,147 2,121 2,026 3,243 1,661 1,582 677 343 334 227 116 110
6 4,165 2,131 2,034 3,269 1,675 1,594 674 342 332 222 114 108
7 4,151 2,124 2,027 3,258 1,671 1,587 682 345 337 211 108 103
8 3,848 1,970 1,878 3,003 1,540 1,463 647 328 319 198 102 97
9 4,034 2,067 1,967 3,148 1,616 1,533 677 344 333 209 107 102
                         
10-14 19,579 10,030 9,548 15,406 7,910 7,497 3,133 1,591 1,542 1,039 530 509
10 3,992 2,047 1,945 3,134 1,609 1,525 655 333 322 203 105 98
11 3,923 2,010 1,913 3,095 1,589 1,506 626 317 309 202 104 98
12 3,906 1,998 1,908 3,073 1,575 1,497 626 318 308 208 105 102
13 3,829 1,959 1,869 3,014 1,546 1,468 604 306 298 211 107 104
14 3,929 2,016 1,913 3,091 1,589 1,501 623 317 306 216 109 106
                         
15-19 19,484 10,012 9,472 15,388 7,938 7,450 3,107 1,567 1,539 989 506 483
15 3,969 2,039 1,930 3,119 1,607 1,512 640 326 315 210 107 104
16 3,913 2,019 1,895 3,088 1,597 1,491 621 317 304 204 104 100
17 4,016 2,077 1,939 3,164 1,643 1,522 651 332 318 201 102 99
18 3,741 1,921 1,821 2,964 1,528 1,436 595 298 298 182 95 87
19 3,843 1,956 1,887 3,054 1,563 1,490 599 294 304 191 99 92
                         
20-24 17,771 9,000 8,772 14,123 7,208 6,916 2,660 1,282 1,378 988 510 478
20 3,782 1,923 1,858 3,009 1,540 1,469 583 285 298 190 98 91
21 3,554 1,807 1,747 2,824 1,444 1,379 535 261 274 195 102 93
22 3,493 1,770 1,723 2,787 1,423 1,365 512 247 265 193 100 93
23 3,395 1,715 1,681 2,696 1,373 1,322 503 240 263 197 101 95
24 3,548 1,785 1,763 2,808 1,427 1,380 526 249 277 214 109 105
                         
25-29 19,256 9,596 9,661 15,407 7,757 7,650 2,707 1,267 1,440 1,143 572 571
25 3,714 1,861 1,853 2,946 1,491 1,455 543 256 287 226 114 112
26 3,951 1,963 1,988 3,152 1,580 1,572 562 264 299 237 119 118
27 3,969 1,978 1,991 3,189 1,605 1,584 545 255 290 236 118 117
28 3,650 1,815 1,835 2,951 1,483 1,468 488 228 260 211 104 107
29 3,972 1,979 1,993 3,169 1,598 1,571 569 265 305 233 116 117
                         
30-34 20,911 10,416 10,495 16,966 8,541 8,425 2,859 1,355 1,504 1,086 520 566
30 3,926 1,958 1,968 3,166 1,596 1,570 548 261 287 211 100 111
31 3,938 1,961 1,977 3,169 1,595 1,574 555 264 290 214 102 112
32 4,179 2,079 2,100 3,390 1,705 1,685 572 271 302 217 104 113
33 4,316 2,141 2,174 3,526 1,769 1,758 574 270 304 215 103 112
34 4,553 2,277 2,276 3,714 1,876 1,838 609 289 320 229 111 118
                         
35-39 22,725 11,315 11,410 18,727 9,420 9,307 2,936 1,386 1,550 1,063 510 553
35 4,598 2,294 2,304 3,775 1,902 1,873 604 286 318 218 106 113
36 4,510 2,241 2,269 3,724 1,871 1,854 574 269 305 213 102 111
37 4,589 2,284 2,306 3,774 1,898 1,876 599 282 317 216 103 113
38 4,264 2,115 2,149 3,526 1,768 1,758 542 254 288 196 93 103
39 4,764 2,382 2,383 3,928 1,982 1,946 617 294 323 219 106 114
                         
40-44 21,493 10,657 10,836 17,850 8,945 8,905 2,656 1,247 1,409 988 465 523
40 4,607 2,292 2,315 3,811 1,915 1,896 587 277 310 210 100 110
41 4,332 2,145 2,187 3,584 1,794 1,790 542 253 288 206 97 109
42 4,281 2,124 2,157 3,555 1,783 1,773 530 249 281 196 93 103
43 4,123 2,033 2,090 3,422 1,706 1,716 504 235 269 196 91 105
44 4,150 2,063 2,087 3,477 1,747 1,730 493 233 261 180 84 96
                         
45-49 18,581 9,138 9,444 15,612 7,767 7,845 2,138 984 1,154 831 387 444
45 3,974 1,964 2,010 3,335 1,668 1,667 467 217 250 172 80 92
46 3,696 1,819 1,877 3,097 1,543 1,554 431 198 233 168 78 90
47 3,705 1,819 1,886 3,082 1,532 1,550 447 205 242 175 81 93
48 3,440 1,682 1,757 2,914 1,442 1,473 375 171 204 150 70 81
49 3,767 1,854 1,913 3,184 1,583 1,601 418 193 225 165 77 88
                         
50-54 15,061 7,346 7,715 12,963 6,386 6,578 1,490 670 820 608 290 318
50 3,875 1,902 1,973 3,362 1,666 1,696 365 166 199 148 70 77
51 2,704 1,319 1,385 2,301 1,134 1,167 278 125 153 125 60 65
52 2,750 1,339 1,411 2,351 1,157 1,194 283 127 156 117 56 61
53 2,771 1,346 1,425 2,383 1,169 1,214 279 125 154 109 52 56
54 2,961 1,440 1,521 2,565 1,259 1,306 286 128 158 110 52 58
                         
55-59 11,665 5,615 6,050 10,012 4,870 5,142 1,199 527 672 453 217 236
55 2,514 1,214 1,301 2,141 1,043 1,097 273 122 151 101 48 53
56 2,423 1,167 1,256 2,085 1,016 1,069 244 106 139 93 45 48
57 2,338 1,125 1,213 1,999 972 1,027 247 109 138 92 44 48
58 2,151 1,033 1,118 1,863 904 960 208 91 117 79 38 41
59 2,240 1,077 1,163 1,925 935 989 227 100 127 88 42 46
                         
60-64 9,957 4,712 5,246 8,598 4,116 4,482 995 428 567 364 168 197
60 2,067 978 1,089 1,780 851 929 208 90 118 79 38 42
61 2,011 956 1,055 1,738 836 901 199 85 114 74 35 39
62 2,028 960 1,067 1,753 841 913 201 86 115 73 34 39
63 1,903 904 999 1,651 794 857 185 80 105 68 31 37
64 1,948 913 1,036 1,676 794 881 202 87 115 70 31 39
                         
65-69 9,666 4,432 5,235 8,440 3,905 4,535 927 398 529 299 129 171
65 1,928 893 1,035 1,661 779 882 201 85 116 65 29 36
66 1,976 913 1,064 1,719 800 919 195 86 109 62 27 35
67 1,966 909 1,057 1,717 803 914 189 80 109 60 26 34
68 1,869 851 1,018 1,642 753 889 171 74 97 56 24 32
69 1,927 866 1,061 1,701 770 931 170 73 97 56 23 33
                         
70-74 8,657 3,786 4,871 7,714 3,396 4,318 707 289 418 236 101 135
70 1,837 817 1,020 1,621 727 894 164 68 96 53 23 30
71 1,771 780 991 1,570 696 874 151 62 89 49 21 28
72 1,772 780 993 1,586 702 884 138 57 81 49 21 28
73 1,669 721 947 1,499 653 846 126 50 76 43 18 25
74 1,608 688 920 1,439 619 820 128 52 76 42 18 24
                         
75-79 7,003 2,903 4,100 6,311 2,628 3,683 534 208 327 158 67 91
75 1,605 683 922 1,443 617 827 124 50 74 38 16 22
76 1,517 643 874 1,371 584 787 111 44 67 34 15 20
77 1,371 569 802 1,233 514 719 106 41 65 32 14 18
78 1,305 529 776 1,178 480 698 99 37 62 28 12 16
79 1,205 480 726 1,085 433 653 94 36 59 26 11 15
                         
80-84 4,603 1,707 2,896 4,190 1,558 2,632 322 111 212 91 39 52
80 1,080 421 659 983 384 598 76 27 49 21 9 12
81 999 380 619 912 348 564 68 24 44 20 8 11
82 922 342 580 842 313 529 63 22 41 18 8 10
83 841 301 540 767 275 492 58 19 39 16 7 9
84 760 263 498 686 237 449 58 19 39 16 7 9
                         
85-89 2,437 765 1,672 2,221 693 1,528 171 53 117 45 18 27
85 626 211 415 573 193 381 41 14 27 12 5 7
86 553 177 376 504 161 343 39 12 27 10 4 6
87 482 149 333 438 135 303 35 11 24 9 4 5
88 417 125 292 380 113 267 29 9 21 8 3 5
89 359 102 256 326 92 234 26 8 19 7 3 4
                         
90-94 1,052 270 781 947 239 707 85 23 62 20 8 12
90 297 81 216 269 73 196 23 6 16 5 2 3
91 247 65 182 223 58 165 19 5 14 5 2 3
92 212 53 158 190 47 143 18 5 13 4 2 3
93 166 41 126 149 36 114 14 4 10 3 1 2
94 129 30 99 116 26 89 11 3 8 3 1 2
                         
95-99 297 63 233 262 54 208 27 7 20 7 2 5
95 95 22 74 85 19 66 8 2 6 2 1 1
96 81 18 63 70 15 56 9 2 6 2 1 1
97 56 12 44 49 10 39 5 1 4 1 0 1
98 38 7 30 34 6 27 3 1 2 1 0 1
99 27 5 22 24 4 20 2 1 2 1 0 0
                         
100+ 60 11 49 50 8 42 8 2 6 2 1 1
                         
0-14 59,749 30,588 29,161 46,915 24,067 22,848 9,614 4,878 4,736 3,220 1,644 1,576
0-44 181,390 91,584 89,806 145,376 73,876 71,501 26,538 12,981 13,556 9,476 4,727 4,749
0-64 236,655 118,394 118,261 192,562 97,015 95,547 32,361 15,591 16,769 11,733 5,789 5,944
                         
15-44 121,641 60,996 60,645 98,461 49,809 48,652 16,923 8,104 8,820 6,256 3,083 3,173
45-64 55,265 26,810 28,455 47,186 23,139 24,046 5,823 2,610 3,213 2,256 1,062 1,195
                         
15+ 210,681 101,744 108,937 175,781 85,429 90,352 25,529 11,805 13,724 9,371 4,510 4,861
45+ 89,040 40,748 48,292 77,320 35,621 41,700 8,605 3,701 4,904 3,115 1,427 1,688
65+ 33,775 13,938 19,837 30,135 12,481 17,653 2,782 1,091 1,691 858 365 493
75+ 15,451 5,720 9,731 13,981 5,181 8,800 1,147 404 744 323 135 188
85+ 3,845 1,109 2,736 3,480 995 2,485 291 85 205 74 29 45


Appendix D

UNWEIGHTED FREQUENCIES FOR SELECTED VARIABLES

NEWBORN INFANTS

NON-NEWBORNS

SURVEY YEAR

97

33,612

266,852

UNITS FOR AGE

1=Years

0

258,210
2=Months

0

6,126
3=Days

33,612

2,516

AGE GROUPS

Under 15 33,612 25,859
15-44 0 88,197
45-64 0 54,652
65 & Up 0 98,144
SEX
1=Male

17,193

105,713
2=Female

16,419

161,139
RACE
1=White 17,278 151,694
2=Black 4,154 35,778
3=AmInd/Esk 134 812
4=Asian/PI 862 3,555
5=Other 1,930 8,744
9=NotStated 9,254 66,269
MARITAL STATUS
1=Married 0 39,805
2=Single 10,783 24,194
3=Widowed 0 13,113
4=Divorced 0 4,663
5=Separated 0 926
9=NotStated 22,829 184,151
DISCHARGE STATUS
1=Routine 32,409 212,232
2=LAMA 11 2,030
3=TrShtTrm 385 7,703
4=TrLngTrm 44 21,547
5=Alive,NS 537 15,481
6=Dead 117 6,803
9=NotStated 109 1,056
LENGTH OF STAY FLAG
0=LT 1 day 529 5,299
1=1 day or more 33,083 261,553
NEWBORN INFANTS NON-NEWBORNS
REGION
1=NorthEast 5,778 58,519
2=MidWest 10,423 82,671
3=South 11,323 91,519
4=West 6,088 34,143
BEDSIZE
1=6-99 2,883 30,490
2=100-199 7,623 62,770
3=200-299 8,268 58,230
4=300-499 10,181 80,141
5=500 & over 4,657 35,221
HOSPITAL OWNERSHIP
1=Proprietary 2,134 17,408
2=Government 2,844 24,678
3=Nonprofit 28,634 224,766
EXPECTED SOURCE OF PAYMENT, PRINCIPAL
0=No Charge 103 728
1=Worker's Comp 16 1,793
2=Medicare 43 98,775
3=Medicaid 9,593 37,389
4=Other Govt Payments 283 2,554
5=Blue Cross 3,362 19,490
6=Other Priv/Comm Ins 14,610 72,801
7=SelfPay 1,968 12,919
8=Other 3,398 18,701
9=Not Stated 236 1,702
ADMISSION MONTH
01=January 2,312 19,446
02=February 2,169 17,874
03=March 2,376 19,398
04=April 2,361 18,754
05=May 2,417 18,549
06=June 2,370 18,030
07=July 2,571 18,537
08=August 2,541 18,142
09=September 2,493 18,754
10=October 2,361 18,676
11=November 2,200 17,234
12=December 2,373 18,907
99=Missing 5,068 44,551
NEWBORN INFANTS NON-NEWBORNS
FIRST-LISTED DIAGNOSIS
VCODES 33,612 40,114
CHAPTER 1 0 7,874
CHAPTER 2 0 15,356
CHAPTER 3 0 11,052
CHAPTER 4 0 3,473
CHAPTER 5 0 16,922
CHAPTER 6 0 4,755
CHAPTER 7 0 51,429
CHAPTER 8 0 28,590
CHAPTER 9 0 24,802
CHAPTER 10 0 14,044
CHAPTER 11 0 4,796
CHAPTER 12 0 3,879
CHAPTER 13 0 12,691
CHAPTER 14 0 2,009
CHAPTER 15 0 1,670
CHAPTER 16 0 2,158
CHAPTER 17

0

21,238

WEIGHTED FREQUENCIES FOR SELECTED VARIABLES
NEWBORN INFANTS NON-NEWBORNS
SURVEY YEAR

97

3,789,839

30,914,167

UNITS FOR AGE
1=Years 0 30,139,011
2=Months 0 572,340
3=Days 3,789,839 202,816
AGE GROUPS
Under 15 3,789,839 2,311,503
15-44 0 10,029,526
45-64 0 6,377,224
65 & Up 0 12,195,914
SEX
1=Male 1,931,256 12,267,559
2=Female 1,858,583 18,646,608
RACE
1=White 2,161,166 19,971,406
2=Black 461,685 3,689,251
3=AmInd/Esk 17,943 120,584
4=Asian/PI 100,455 388,162
5=Other 216,146 1,003,312

9=NotStated

832,444 5,741,452
MARITAL STATUS
1=Married 0 9,051,303
2=Single 2,392,001 5,370,731
3=Widowed 0 3,093,781
4=Divorced 0 1,087,456
5=Separated 0 168,746
9=NotStated 1,397,838 12,142,150
DISCHARGE STATUS
1=Routine 3,624,857 24,436,142
2=LAMA 2,182 219,521
3=TrShtTrm 50,088 1,206,021
4=TrLngTrm 5,735 2,544,501
5=Alive,NS 61,357 1,482,359
6=Dead 12,835 782,838
9=NotStated 32,785 242,785
LENGTH OF STAY FLAG
0=LT 1 day 67,707 689,528
1=1 day or more 3,722,132 30,224,639
NEWBORN INFANTS NON-NEWBORNS
REGION
1=NorthEast 604,959 6,679,107
2=MidWest 850,556 7,234,030
3=South 1,423,281 11,445,029
4=West 911,043 5,556,001
BEDSIZE
1=6-99 655,571 6,403,367
2=100-199 1,089,232 8,135,109
3=200-299 679,540 5,849,513
4=300-499 961,071 7,022,870
5=500 & over 404,425 3,503,308
HOSPITAL OWNERSHIP
1=Proprietary 471,682 3,395,267
2=Government 459,336 3,662,500
3=Nonprofit 2,858,821 23,856,400
EXPECTED SOURCE OF PAYMENT, PRINCIPAL
0=No Charge 14,170 98,497
1=Worker's Comp 1,521 230,175
2=Medicare 9,548 12,253,599
3=Medicaid 1,223,610 4,379,531
4=Other Govt Payments 44,658 367,744
5=Blue Cross 380,097 2,216,013
6=Other Priv/Comm Ins 1,656,054 8,618,340
7=SelfPay 233,284 1,487,100
8=Other 171,212 958,139
9=Not Stated 55,685 305,029
ADMISSION MONTH
01=January 275,521 2,508,228
02=February 261,540 2,260,850
03=March 282,192 2,479,300
04=April 284,308 2,361,873
05=May 292,699 2,383,849
06=June 282,342 2,289,355
07=July 300,305 2,327,633
08=August 306,075 2,222,167
09=September 283,344 2,283,817
10=October 283,070 2,314,296
11=November 278,983 2,128,485
12=December 294,390 2,358,700
99=Missing 365,070 2,995,614
NEWBORN INFANTS NON-NEWBORNS
FIRST-LISTED DIAGNOSIS
VCODES 3,789,839 4,317,536
CHAPTER 1 0 853,472
CHAPTER 2 0 1,748,574
CHAPTER 3 0 1,298,546
CHAPTER 4 0 372,732
CHAPTER 5 0 1,963,955
CHAPTER 6 0 553,984
CHAPTER 7 0 6,097,056
CHAPTER 8 0 3,474,793
CHAPTER 9 0 2,997,914
CHAPTER 10 0 1,694,207
CHAPTER 11 0 500,197
CHAPTER 12 0 453,568
CHAPTER 13 0 1,499,946
CHAPTER 14 0 155,301
CHAPTER 15 0 137,580
CHAPTER 16 0 274,389
CHAPTER 17 0 2,520,417
NEWBORN INFANTS NON-NEWBORNS
ALL-LISTED DIAGNOSES
TOTAL 7,245,315 129,657,636
ECODES 5,768 3,584,938
VCODES 4,521,359 9,900,945
CHAPTER 1 37,956 3,460,434
CHAPTER 2 12,911 4,333,299
CHAPTER 3 12,694 12,777,158
CHAPTER 4 6,019 4,053,246
CHAPTER 5 451 7,958,801
CHAPTER 6 13,661 3,542,537
CHAPTER 7 17,135 27,462,634
CHAPTER 8 13,030 9,961,729
CHAPTER 9 21,580 8,176,753
CHAPTER 10 31,473 6,935,224
CHAPTER 11 0 8,246,897
CHAPTER 12 22,596 1,579,259
CHAPTER 13 10,988 4,568,309
CHAPTER 14 235,665 560,539
CHAPTER 15 2,221,071 368,115
CHAPTER 16 53,596 6,295,830
CHAPTER 17 7,362 5,890,989
ALL-LISTED PROCEDURES
TOTAL 2,498,324 40,509,419
CHAPTER 1 48,694 1,042,944
CHAPTER 2 0 104,207
CHAPTER 3 760 134,911
CHAPTER 4 346 47,200
CHAPTER 5 2,966 311,224
CHAPTER 6 12,486 1,015,624
CHAPTER 7 92,858 5,382,095
CHAPTER 8 255 342,317
CHAPTER 9 12,152 5,052,040
CHAPTER 10 4,251 989,743
CHAPTER 11 1,213,323 316,863
CHAPTER 12 253 2,067,680
CHAPTER 13 0 6,682,247
CHAPTER 14 1,861 3,172,485
CHAPTER 15 9,893 1,219,594
CHAPTER 16 1,098,226 12,628,245



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