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Scientific Data Documentation
National Survey of Ambulatory Surgery, 1996
1996 NATIONAL SURVEY OF AMBULATORY SURGERY
PUBLIC USE DATA TAPE DOCUMENTATION


Abstract

This material provides documentation for users of the 1996 NSAS Public Use Data Tape. The NSAS was implemented by the National Center for Health Statistics (NCHS) in 1994. It covers ambulatory surgery procedures performed in hospitals and free-standing ambulatory surgery centers in the United States.

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

Section II provides technical details of the tape.

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

Appendix A defines certain terms used in this document;
Appendix B contains 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 descriptive variables.


I. Description of the National Survey of Ambulatory Surgery

Introduction. This document describes the 1996 National Survey of Ambulatory Surgery (NSAS) and provides information for users of the 1996 NSAS public use data file. This survey, conducted by the National Center for Health Statistics (NCHS) and implemented in 1994, covers ambulatory surgery procedures performed in hospitals and in free-standing ambulatory surgery centers in the United States. A brief description of the survey design and data collection procedures is given below. A more detailed description of the survey design, data collection procedures, and the estimation process has been published (1).

History. The National Survey of Ambulatory Surgery was undertaken to obtain information about the use of ambulatory surgery. Ambulatory, or outpatient, surgery has increased in the United States since the early 1980's. Two major reasons for this increase were advances in medical technology and cost containment initiatives.

On the medical side, many surgeries performed for hospital inpatients have moved to outpatient settings. This is due, in part, to the fact that improvements in anesthesia and better analgesics for relief of pain have made surgery less complex and risky (2). Also, minimally invasive and non-invasive procedures, such as laser surgery, laparoscopy, and endoscopy, have been developed and are being performed with increasing frequency.

On the cost side, concern about rising health care costs led to changes in the Medicare program that encouraged the use of ambulatory surgery (3). In 1982 the Medicare program was expanded to cover care in ambulatory surgery centers. In 1983, a prospective payment system based on diagnosis-related groups (DRG's) was adopted for hospital inpatient care. This system created strong financial incentives for hospitals to perform less complex surgery in an ambulatory setting. In the mid-1980's, the peer review organizations for Medicare established outpatient settings as the norm for certain surgeries and denied Medicare payment for hospital admissions deemed inappropriate or medically unnecessary. Many State Medicaid plans and private insurers followed the lead of the Medicare program and adopted similar policies.

As these changes went into effect, freestanding ambulatory surgery centers increased in number, from 239 centers that performed 380,000 procedures in 1983, to over 1,800 centers performing more than 3.2 million procedures ten years later (4). The number of ambulatory surgery procedures done in hospitals and freestanding settings combined rose from 5.4 million in 1983 to 16.2 million in 1993 (5).

The National Hospital Discharge Survey (NHDS), which has been conducted by the National Center for Health Statistics every year since 1965, includes information on procedures performed on inpatients (6). The NHDS remains a good source of data for surgical procedures, such as open-heart surgery or cesarean sections, that must be done on an inpatient basis. But for surgeries that can be performed on an ambulatory basis, NHDS estimates are incomplete. Thus the National Survey of Ambulatory Surgery was undertaken to provide data on the increasing use of this type of health care.

SURVEY METHODOLOGY

Source of the Data. The NSAS covers ambulatory surgery procedures performed in hospitals and free-standing ambulatory surgery centers (FSASC). The hospital universe includes noninstitutional hospitals exclusive of Federal, military, and Department of Veterans Affairs 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 beds or more staffed for patient use. The universe definition is the same as that used for the National Hospital Discharge Survey. The sampling frame for the hospital universe consisted of eligible hospitals listed in the 1993 SMG Hospital Market Database (7).

The universe of freestanding facilities includes FSASCs that are regulated by the States or certified by HCFA, the Health Care Financing Administration, for Medicare participation. The sampling frame consisted of facilities listed in the 1993 Freestanding Outpatient Surgery Center Database (8) and Medicare-certified facilities included in the HCFA Provider-of-Services (POS) file (9). Facilities specializing in dentistry, podiatry, abortion, family planning, or birthing are excluded. However, these procedures are not excluded from in-scope locations.


Sample design and data collection
. The NSAS samples facilities using a multi-stage probability design with some facilities selected with certainty and others sampled with varying selection probabilities. Independent samples of hospitals and free-standing ambulatory surgery centers were drawn. The sample includes with certainty facilities which perform a high volume of ambulatory surgeries annually. Non-certainty facilities are selected using a stratified, cluster design, where the clusters are 198 primary sampling units (PSUs) that comprise the sample of PSUs used in the 1985-1996 National Health Interview Survey (NHIS). PSUs are counties or groups of counties, or county equivalents, or towns and townships (the latter in New England and Hawaii).

Noncertainty facilities were stratified by facility type (hospital versus freestanding), ambulatory surgery status of hospitals (i.e. whether or not the hospital performed such surgery), facility specialty, and geographic region. From each stratum containing fewer than six facilities, up to three facilities were selected by means of systematic random sampling, with selection probabilities proportional to size, where size is the number of ambulatory surgeries performed annually. For strata containing six or more facilities, first stage sampling involved selection of 112 PSUs, which are a probability subsample of the 198 PSUs in the 1985-94 NHIS sample. Some of these PSUs were sampled with certainty. Selection of noncertainty PSUs was performed within PSU strata defined within the four geographic regions by the number of people in the 1980 Census of Population and NHIS stratification variables. From each PSU stratum, the PSUs were selected with probability proportional to the projected 1985 population. The hospital sample is clustered within a probability subsample of 112 of those PSUs.

The second stage of the cluster design consisted of selection of noncertainty facilities from the sampled PSUs, using systematic random sampling with probabilities proportional to the annual number of ambulatory surgeries performed. For both hospitals and FSASCs, up to three facilities of each type and specialty were selected from each non-certainty PSU and up to 15 facilities were selected across the combined certainty PSUs in each region. For the stratum of hospitals which, according to the sampling frame data, did not have ambulatory surgery, a national sample of 50 hospitals was selected to permit estimates of surgery in hospitals that either change their status or differ from frame data. Any sampled facility which performed less than 50 ambulatory surgeries in the year prior to the data collection year was considered out-of-scope for the data collection year.

Within sampled facilities, a sample of ambulatory surgery visits was selected using a systematic random sampling procedure. Selection of visits within each facility was performed separately for each location where ambulatory surgery is performed. These locations include: main operating rooms, dedicated ambulatory surgery units, cardiac catherization laboratories, laser procedure rooms, endoscopy and laparoscopy rooms, etc. Locations within facilities that specialize in or are dedicated to inpatients, dentistry, abortion, podiatry, pain block, or small procedures are excluded. However, as mentioned above, these procedures are not excluded from in-scope locations.

Following selection of ambulatory surgery visits, data was abstracted from the medical record for each visit. The Medical Abstract Form used in data collection is shown in Figure 1. It contains items relating to the personal characteristics of the patient, including birth date or age, sex, race, zipcode, but not name and address; administrative information, including the date of the surgery, dispostion of the patient, and medical record number; principal and other additional expected sources of payment; and medical information, including diagnoses and surgical and nonsurgical procedures performed, as well as types of anesthesia administered and by whom. The medical record number, date of birth, and patient zip code, are confidential information and are not available to the public.

Response Rate. The 1996 NSAS sample included 332 ASCs from the 1,732 facilities in the 1993 FSASC sampling frame; and 418 hospitals from the 6,267 listed in the 1993 hospital sampling frame. Of the 750 sampled facilities, 150 were found to be out-of-scope for the NSAS. Nineteen percent of the 600 in-scope facilities were nonresponding in 1996. The number of hospitals responding in 1996 was 298, which was 91 percent of the 329 in-scope hospitals. The number of FSASCs responding in 1996 was 190, which represented 70 percent of the 272 in-scope FSASCs.

Medical Coding and Edit. The medical information abstracted from the sampled medical records was coded centrally by NCHS contract staff. A maximum of seven diagnostic codes and six procedure codes was assigned for each sampled abstract. The system currently used for coding the diagnoses and procedures on the medical abstract forms is the International Classification of Diseases, 9th Revision, Clinical Modification, or ICD-9-CM (10).

Following conversion of the data on the medical abstract to computer tape, 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.

Users of the NSAS diagnostic and/or procedure data 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. However, in order to preserve consistent coding throughout the data year, the NSAS coding for 1996 data is consistent with the ICD-9-CM and the Addenda through October 1, 1995. Appendix B lists the changes for 1986 through 1995.

Population Estimates. Appendix C shows population estimates provided by the U.S. Bureau of the Census. The estimates are of the U.S. civilian resident population on July l of the data year. These population estimates are consistent with those published in Current Population Reports, Series P-25; however, they are not official population estimates of the Bureau of the Census.

Measurement Errors and Limitations of the Data. As in any survey, results are subject to nonsampling or measurement errors, which include errors due to facility nonresponse, missing abstracts, information incompletely or inaccurately recorded on abstract forms, and processing errors.

In a very small number of records, the age or sex of the patient was missing. For these records, a legitimate value was imputed in such a way as to preserve the original, known distribution of the variable. Fewer than two percent of the records have an imputed age or sex value.

Forty-two percent of the records were missing a value for race of the patient. No attempt was made to impute for these missing values.

Figure 1. Medical abstract for the 1996 National Survey of Ambulatory Surgery



The determination of whether an ambulatory surgery facility is a hospital or a freestanding center is based on the SMG universe from which the facility is selected. In most cases it is apparent whether a facility is a hospital or a freestanding ambulatory surgery center, but some facilities are not easily classified. For example, a "freestanding" facility may be owned by a hospital but located some distance away. If such a facility is separately listed in the 1993 SMG Freestanding Outpatient Surgery Center Database and is selected into the NSAS sample from this universe, it is considered a freestanding facility.

The distinction between ambulatory and inpatient surgery is not always clear. According to the 1996 NSAS, an estimated 1.9 percent of ambulatory surgery visits were for patients subsequently admitted to the hospital as inpatients. Some of these patients had procedures which are currently performed exclusively on inpatients, such as coronary artery bypass graft, in addition to diagnostic procedures such as cardiac catheterization. These visits and their suspected "inpatient" procedures have not been eliminated from the data file because they are operationally part of the survey design. It is left to the prerogative of the researcher whether or not to include these procedures in an analysis. In NCHS publications for the 1994 NSAS, patients discharged to inpatient status were included in estimates of visits and procedures. For the 1995 and 1996 NSAS, these visits were excluded from all tabulations.

Sampling errors. Statistics from the NSAS are derived by a multistage estimation procedure that produces essentially unbiased estimates. The estimation procedure has three basic components: (a) inflation by reciprocals of the probabilities of sample selection, (b) adjustment for nonresponse, and (c) population weighting ratio adjustments.

The standard error of a statistic 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 (RSE) 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 has been published (11).

Relative Standard Errors for Aggregate Estimates

Table 1 presents parameter estimates to be used in formulae for deriving the approximate relative standard errors for aggregate estimates. To provide error estimates that would be applicable to a wide variety of statistics, numerous variances were calculated and the best fit formula was derived. The formula is based on an empirically determined relationship between the size of an estimate X and its relative variance. The relative standard error is then derived by taking the square root of the relative variance. The relative standard error of an estimate X [RSE(X)], expressed as a percent, may be calculated from the formula:

with a and b provided in Table 1.

For example, in 1996 the estimated number of ambulatory surgery visits to hospitals and free-standing ambulatory surgery centers by persons aged 65 and over with a first-listed diagnosis of cataracts (ICD-9-CM code 366) was 1,952,000 (excluding those visits admitted to hospitals as inpatients). Using the applicable constants from Table 1 for estimates by age produces:

RSE(1,952,000) = 6.58 %

The relative standard error for the estimate of interest is 6.58 percent. From this the standard error is obtained by multiplying the relative standard error by the estimate:

SE(1,952,000) = 1,952,000 * 6.58 % = 128,442

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 total number visits by persons aged 65 and over with a first-listed diagnosis of cataracts is:

(1,952,000 - 2*128,442)<-> (1,952,000 + 2*128,442)

1,695,116<->2,208,884

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), (expressed as a percent), 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 value, b, given in Table 1.

For example, in 1996 the estimated number of ambulatory surgery visits by persons 65 years old and over was 6,998,000 (excluding those admitted to hospitals as inpatients). This is 33.6 percent of the estimated 20,838,000 visits for that year. Using the applicable constants from Table 1 for estimates by age produces:

RSE (.336) = 0.655%

The relative standard error for the estimate of interest is 0.655 percent. From this the standard error is obtained by multiplying the relative standard error by the estimate:

SE(.336) = .336 * 0.655 % = .0022

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 ambulatory surgery visits by persons in the 65 and over age group is:

(.336 - 2*.0022) <-> (.336 + 2*.0022)

.332 <-> .340

or, equivalently, 33.2% <->34.0%

Table 1. Estimated parameters for relative standard error formulae for National Survey of Ambulatory Surgery aggregate  
              statistics by statistic type: United States, 1996

Characteristic First-listed diagnoses

TOTAL

All-listed procedures TOTAL First-listed diagnoses Hospital All-listed procedures Hospital First-listed diagnoses Freestanding All-listed procedures Freestanding
  a b a b a b a b a b a b
TOTAL 0.00362 515.109 0.00356 644.341 0.00914 695.494 0.00413 659.574 0.04372 130.840 0.02120 103.392
SEX                        
Male 0.00329 551.613 0.00366 563.173 0.00379 579.559 0.00424 588.725 0.01632 159.005 0.01849 154.071
Female 0.00638 684.723 0.00366 563.173 0.00851 598.747 0.00424 588.725 0.01632 159.005 0.01849 154.071
AGE                        
Under 15 Years 0.00417 359.202 0.00516 338.199 0.00451 385.025 0.00580 346.482 0.02270 151.749 0.01975 154.088
15-44 years 0.00368 493.767 0.00402 544.278 0.00404 526.481 0.00432 602.045 0.01567 151.412 0.01975 154.088
45-64 years 0.00342 549.183 0.00445 502.229 0.00398 586.678 0.00501 577.548 0.01567 151.412 0.01757 153.988
65 years and over 0.00410 452.924 0.00458 439.690 0.00512 468.762 0.00559 464.666 0.05699 77.782 0.06462 94.912
REGION                        
Northeast 0.01370 397.969 0.01245 523.405 0.01479 402.828 0.02186 606.764 0.04601 220.357 0.05544 115.495
Midwest 0.00100 1,055.211 0.01851 787.293 0.00199 1,044.057 0.01421 458.817 0.04788 178.682 0.05544 115.495
South 0.01985 507.941 0.01201 384.235 0.01479 402.828 0.01325 391.794 0.04597 149.763 0.03901 78.268
West 0.01267 405.414 0.01601 378.322 0.01479 402.828 0.02117 396.008 0.04601 220.357 0.05176 127.581
EXP SOURCE OF PYMT                      
WC 0.00866 348.044 0.01342 433.164 0.01494 468.010 0.01606 496.465 0.02812 178.616 0.03380 132.951
Medicare 0.00497 417.136 0.00548 400.935 0.00607 436.564 0.00660 424.813 0.02371 129.197 0.02350 141.168
Medicaid 0.00866 348.044 0.00951 309.740 0.00741 341.659 0.01053 314.720 0.02812 178.616 0.03380 132.951
Othr Govt 0.00866 348.044 0.01342 433.164 0.01494 468.010 0.01606 496.465 0.02812 178.616 0.03380 132.951
Private Insurance 0.00277 850.458 0.00481 567.757 0.00430 619.704 0.00548 617.649 0.03018 202.646 0.01885 160.261
Self-Pay 0.00866 348.044 0.01342 433.164 0.01494 468.010 0.01606 496.465 0.02812 178.616 0.03380 132.951
NC/Other 0.00866 348.044 0.01342 433.164 0.01494 468.010 0.01606 496.465 0.02812 178.616 0.03380 132.951
Not Stated 0.09954 389.357 0.08124 279.306 0.01494 468.010 0.09493 244.499 0.02812 178.616 0.20987 424.040


Presentation of Estimates. Publication of estimates for the NSAS 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 NSAS, the following guidelines are used for presenting the NSAS 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.

How to Use the Data Tape. The NSAS 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 visits, the weights for the desired records must be summed.

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

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. McLemore T and Lawrence L. Plan and Operation of the National Survey of Ambulatory Surgery. Vital and Health
    Statistics, Series 1, No. 37. Hyattsville, MD: National Center for Health Statistics. 1997.

2. New surgical technologies reshape hospital strategies. Hospitals 66(9):30-36, 38, 40-42. 1992.

3. Leader S and Moon M. Medicare trends in ambulatory surgery. Health Affairs Spring: 158-170. 1989.

4. Durant G. Ambulatory surgery centers: surviving, thriving into the 1990's. Medical Group Management Journal 36(2):
    16-18, 20. 1989.

5. SMG Marketing Group, Inc. Outpatient surgery centers exceed 3 million cases. SMG Market Letter 8(5). 1996.

6. Graves EJ and Gillum BS. 1996 summary: National Hospital Discharge Survey. Advance data from Vital and Health
    Statistics; no 278. Hyattsville, Maryland: National Center for Health Statistics. 1996.

7. SMG Marketing Group, Inc. Hospital Market Database. Chicago: Healthcare Information Specialists. April 1993.

8. SMG Marketing Group, Inc. Freestanding Outpatient Surgery Centers Database. Chicago: Healthcare Information
    Specialists. 1993.

9. Health Care Financing Administration. Provider of Services Public Use File. Baltimore: 1993.

10. Public Health Service and Health Care Financing Administration. International Classification of Diseases, 9th Revision,
      Clinical Modification.
Washington: Public Health Service. 4th ed. 1991.

11. Shah BV, Barnwell BG, Bieler GS. SUDAAN User's Manual: Software for Analysis of Correlated Data, Release 6.40.
      Research Triangle Park, NC: Research Triangle Institute. 1996.


II. TECHNICAL DESCRIPTION OF TAPE

Data Set Name------------------------------------------------------BG00.NSAS96.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------------------------------------------------------------------------97
Block Size------------------------------------------------------------------------32,689
Number of Records-------------------------------------------------------------125,433


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 in the record. Data elements are arranged sequentially according to their physical location on the tape record. Data are derived from the abstract form; the SMG Hospital Market Tape is an alternative source of data; some items are computer generated.

Item Number Tape

Location

Number of Positions Item Description and Codes
1 1-2 2 Survey Year: 96
2 3 1 Facility Type:

1=Hospital

2=Free-Standing Ambulatory Surgery Center

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 Age Flag:

1 = Value for Age was Imputed

2 = Value for Age was Not Imputed

6 8 1 Sex:

1 = Male

2 = Female

7 9 1 Sex Flag:

1 = Value for Sex was Imputed

2 = Value for Sex was Not Imputed

8 10 1 Race:

1 = White

2 = Black

3 = American Indian/Eskimo

4 = Asian/Pacific Islander

5 = Other

9 = Race Not Stated

9 11 1 Discharge Status:

1 = Routine discharge to customary residence

2 = Discharge to observation status

3 = Discharge to recovery care center

4 = Admitted to hospital as inpatient

5 = Surgery cancelled or terminated

6 = Other, specified

9 = Discharge Status Not Stated

10 12-13 2 Month of Surgery:

01 = January to

12 = December

11 14 1 Geographic Region

1 = Northeast

2 = Midwest

3 = South

4 = West

12 15-16 2 Principal Expected Source of Payment

00 = No Charge

01 = Worker's Compensation

02 = Medicare

03 = Medicaid

04 = CHAMPUS

05 = Other Government Payments

06 = Blue Cross/Blue Shield

07 = HMO/PPO

08 = Other private or commercial insurance

09 = Self Pay

10 = Other, specified

99 = No expected source of payment

13 17-18 2 Other Additional Source of Payment #1:

Same coding as Principal ESOP

14 19-20 2 Other Additional Source of Payment #2:

Same coding as Principal ESOP

15 21-25 5 Analysis Weight: Use to Obtain Weighted Estimates
16-25 26-35 10 Type of Anesthesia: 10 types/options

1 = Option Checked

0 = Not Checked/Blank

16 26 1 Type of Anesthesia: Topical/Local
17 27 1 Type of Anesthesia: IV Sedation
18 28 1 Type of Anesthesia: Monitored Anesthesia Care
19 29 1 Type of Anesthesia: Regional, Epidural
20 30 1 Type of Anesthesia: Regional, Spinal
21 31 1 Type of Anesthesia Regional, Retrobulbar block
22 32 1 Type of Anesthesia: Regional, Peribulbar block
23 33 1 Type of Anesthesia: Regional, Block
24 34 1 Type of Anesthesia: General
25 35 1 Type of Anesthesia: Other, specified
26-28 36-38 3 Anesthesia Administrator: 3 givers/options

1 = Option Checked

0 = Not checked/Blank

26 36 1 Anesthesia Administrator:

Anesthesiologist

27 37 1 Anesthesia Administrator:

Certified Registered Nurse Anesthetist

28 38 1 Anesthesia Administrator:

Other Surgeon/Physician

29 39-43 5 Diagnosis ICD9-CM ** Code #1
30 44-48 5 Diagnosis ICD9-CM ** Code #2
31 49-53 5 Diagnosis ICD9-CM ** Code #3
32 54-58 5 Diagnosis ICD9-CM ** Code #4
33 59-63 5 Diagnosis ICD9-CM ** Code #5
34 64-68 5 Diagnosis ICD9-CM ** Code #6
35 69-73 5 Diagnosis ICD9-CM ** Code #7
36 74-77 4 Procedure ICD9-CM ** Code #1
37 78-81 4 Procedure ICD9-CM ** Code #2
38 82-85 4 Procedure ICD9-CM ** Code #3
39 86-89 4 Procedure ICD9-CM ** Code #4
40 90-93 4 Procedure ICD9-CM ** Code #5
41 94-97 4 Procedure ICD9-CM ** Code #6

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

* Ages 100 and over were recoded to 99.

** 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 V-Codes and E-codes, the implied decimal is between positions 4 and 5. 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

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.

Free-Standing Ambulatory Surgery Centers-Facilities listed in the 1993 Freestanding Outpatient Surgery Center Database and Medicare-certified facilities included in the HCFA Provider-of-Services (POS) file. Facilities specializing in dentistry, podiatry, abortion, family planning, or birthing are excluded.

Ambulatory Surgery-Scheduled outpatient surgery performed in any of the following locations: general or main operating room, satelitte operating room, cystoscopy room, endoscopy room, cardiac catherterization lab, laser procedures room.

First-listed diagnosis-The coded diagnosis which is listed first on the face sheet of the medical record. The number of first-listed diagnoses is equivalent to the number of ambulatory surgery visits.

Procedures-Surgical or nonsurgical operations, procedures, or special treatments listed by the physician on the medical record. In the NSAS, 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 six procedures is coded.

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

Age-The age of the patient on the birthday prior to the date of surgery.

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

Geographic region-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 1996.

As described earlier in this document, all data collected for the 1996 NSAS were coded using the third edition of the ICD-9-CM, which includes the addenda for 1986 through 1995. Although the October 1996 Addendum was available, it was decided not to implement those coding changes, since the other nine months of data were coded to the 1995 Addendum. This was done in order to prevent NSAS data users from mistaking partial year estimates for annual estimates.

In order to assist users in data retrieval and analysis, a conversion table is provided that shows the date of introduction of each new code and the previously assigned code equivalent. The latter 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
041.81-041.89 1992 041.8
     
041.86 1995 041.84
     
042 1994 042.0-042.2,042.9,043.0-043.3,
    043.9,044.0,044.9
     
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
     
070.41-070.49 1991 070.4
     
070.44 1994 070.41
     
070.51-070.59 1991 070.5
     
070.54 1994 070.51
     
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
     
079.81 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
     
305.1 1994 305.10,305.11,305.12,
    305.13 (delete code)
     
312.81-312.82,381.89 1994 312.8
     
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
     
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 440.20
     
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
     
482.30-482.39 1992 482.3
482.81-482.89 1992 482.8
     
483.0 1992 483
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
     
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 assignments.
     
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
     
753.10-753.17,753.19 1990 753.1
     
759.81-759.89 1989 759.8
     
759.83 1994 759.89
     
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
     
780.01-780.09 1992 780.0
     
780.03 1993 780.01
     
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 (delete code)
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
     
925.1-925.2 1993 925
     
989.81-989.84 1995 989.8
989.89 1995 989.8
     
995.60-995.69 1993 995.0
     
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
996.80-996.89 1987 996.8
     
996.85 1990 999.8
     
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
     
998.81-998.82, 998.89 1994 998.8
     
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 (delete code)
     
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
     
V15.82 1994 305.13 (delete code)
     
V15.84-V15.86 1995 V15.89
     
V25.43 1992 V25.49
V25.5 1992 V25.8
     
V29.0-V29.8 1992 V71.8
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
     
V65.40-V65.45, V65.49 1994 V65.4
     
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
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 (delete)
     
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 (Before October 1986 contents of

current code 36.05 would have been assigned to 36.0), 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)
     
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
     
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
     
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
51.22 1991 51.21 (Code Deleted),51.22
51.23 1991 51.22
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
52.93 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
     
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
     
59.72 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
     
66.01 1992 66.0
66.02 1992 66.73
     
68.15 1987 68.14
68.16 1987 68.13
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 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
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
81.75 1989 81.87
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
     
99.71-99.79 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."



APPENDIX C



Civilian Population* by Sex, Age, Geographic Region and Race

United States, July 1, 1996



[Population estimates consistent with Series P-25,

Current Population Reports, U.S. Bureau of the Census]



Age, geographic
region and race Both sexes Male Female
Population in thousands
All ages 263,998 128,691 135,306
Northeast 51,520 24,867 26,653
Midwest 61,983 30,212 31,771
South 92,373 44,718 47,655
West 58,122 28,895 29,228
White 218,755 107,170 111,586
Black 33,257 15,707 17,550
All other 11,985 5,815 6,171
Under 15 years 57,708 29,549 28,159
Under 1 year 3,769 1,928 1,841
1-4 years 15,516 7,940 7,577
5-14 years 38,422 19,681 18,741
Northeast 10,606 5,433 5,173
Midwest 13,445 6,888 6,557
South 20,097 10,280 9,817
West 13,561 6,949 6,612
White 45,727 23,461 22,266
Black 8,946 4,539 4,408
All other 3,035 1,549 1,486
15-44 years 118,734 59,292 59,442
15-24 years 35,739 18,206 17,533
25-34 years 39,868 19,754 20,114
35-44 years 43,127 21,332 21,795
Northeast 22,835 11,362 11,473
Midwest 27,798 13,901 13,898
South 41,417 20,460 20,957
West 26,684 13,570 13,114
White 96,782 48,770 48,012
Black 15,981 7,613 8,368
All other 5,971 2,909 3,061
45-64 years 53,694 25,969 27,725
45-54 years 32,334 15,804 16,530
55-64 years 21,360 10,165 11,195
Northeast 10,763 5,150 5,613
Midwest 12,612 6,125 6,488
South 19,036 9,140 9,896
West 11,283 5,554 5,729
White 45,979 22,484 23,495
Black 5,564 2,479 3,085
All other 2,151 1,006 1,145
65 years & over 33,861 13,881 19,980
65-74 years 18,669 8,325 10,345
75-84 years 11,430 4,486 6,944
85 years and over 3,762 1,070 2,692
Northeast 7,316 2,922 4,394
Midwest 8,128 3,299 4,829
South 11,824 4,838 6,985
West 6,594 2,822 3,772
White 30,266 12,454 17,813
Black 2,766 1,077 1,689
All other 829 350 478





*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 1996 rates using the civilian resident population.



Civilian Population of the United States, July 1, 1996. Estimates by Age, Sex, and Region.

Data are consistent with the estimates announced in Census Advisory CB94-43. Methodology is described in

Current Population Report Series P25-1106. Release date 3/15/94




United States Northeast Midwest South West

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




Civilian Population in Thousands

ALL 263,998 128,691 135,306 51,520 24,867 26,653 61,983 30,212 31,771 92,373 44,718 47,655 58,122 28,895 29,228
                               
0-4 19,286 9,868 9,418 3,514 1,799 1,715 4,344 2,222 2,121 6,716 3,434 3,282 4,712 2,412 2,300
5-9 19,441 9,954 9,487 3,649 1,871 1,778 4,499 2,305 2,194 6,728 3,440 3,289 4,564 2,339 2,226
10-14 18,981 9,727 9,254 3,443 1,763 1,680 4,602 2,360 2,242 6,653 3,406 3,246 4,284 2,198 2,086
15-19 18,573 9,545 9,028 3,299 1,690 1,609 4,555 2,340 2,215 6,602 3,378 3,224 4,116 2,137 1,979
20-24 17,167 8,662 8,505 3,122 1,574 1,548 4,048 2,041 2,007 6,160 3,056 3,104 3,836 1,989 1,846
25-29 18,733 9,302 9,432 3,691 1,831 1,860 4,266 2,112 2,154 6,510 3,187 3,323 4,267 2,171 2,095
30-34 21,135 10,453 10,682 4,215 2,082 2,133 4,800 2,374 2,426 7,299 3,567 3,732 4,820 2,429 2,392
35-39 22,395 11,096 11,299 4,447 2,200 2,248 5,245 2,612 2,633 7,689 3,763 3,926 5,014 2,521 2,493
40-44 20,732 10,235 10,497 4,061 1,985 2,075 4,883 2,420 2,463 7,157 3,508 3,648 4,632 2,322 2,310
45-49 18,406 9,033 9,373 3,655 1,770 1,885 4,307 2,117 2,190 6,418 3,137 3,280 4,027 2,009 2,017
50-54 13,928 6,771 7,157 2,812 1,351 1,461 3,236 1,576 1,660 4,923 2,379 2,545 2,956 1,465 1,491
55-59 11,361 5,454 5,907 2,276 1,083 1,192 2,695 1,299 1,396 4,063 1,933 2,130 2,328 1,139 1,189
60-64 9,999 4,711 5,288 2,019 945 1,074 2,375 1,133 1,242 3,632 1,691 1,941 1,973 941 1,032
65-69 9,892 4,507 5,384 2,091 939 1,152 2,317 1,061 1,256 3,544 1,605 1,938 1,939 901 1,038
70-74 8,778 3,818 4,960 1,875 799 1,076 2,067 903 1,163 3,094 1,338 1,756 1,742 776 965
75-79 6,873 2,821 4,052 1,508 602 906 1,641 662 980 2,376 973 1,402 1,347 583 763
80-84 4,557 1,666 2,892 1,002 355 647 1,132 406 725 1,553 562 990 872 343 529
85+ 3,762 1,070 2,692 839 227 613 970 266 704 1,257 359 898 695 218 477
                               
0-14 57,708 29,549 28,159 10,606 5,433 5,173 13,445 6,888 6,557 20,097 10,280 9,817 13,561 6,949 6,612
15-44 118,734 59,292 59,442 22,835 11,362 11,473 27,798 13,901 13,898 41,417 20,460 20,957 26,684 13,570 13,114
45-64 53,694 25,969 27,725 10,763 5,150 5,613 12,612 6,125 6,488 19,036 9,140 9,896 11,283 5,554 5,729
                               
15+ 206,290 99,142 107,147 40,914 19,434 21,479 48,538 23,324 25,214 72,277 34,438 37,839 44,561 21,946 22,615
45+ 87,555 39,850 47,705 18,078 8,072 10,006 20,740 9,424 11,316 30,860 13,978 16,882 17,877 8,376 9,501
65+ 33,861 13,881 19,980 7,316 2,922 4,394 8,128 3,299 4,829 11,824 4,838 6,985 6,594 2,822 3,772
75+ 15,192 5,556 9,635 3,349 1,183 2,166 3,743 1,334 2,409 5,185 1,894 3,291 2,913 1,144 1,769

Civilian Population of the United States, July 1, 1996.

Source: U.S. Bureau of the Census. Population Division Release PPL#57.


All races White Black Other races

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




Civilian population in thousands

All 263,998 128,691 135,306 218,755 107,170 111,586 33,257 15,707 17,550 11,985 5,815 6,171
                         
0-4 19,286 9,868 9,418 15,289 7,839 7,450 2,948 1,494 1,454 1,048 534 514
0 3,769 1,928 1,841 3,015 1,546 1,469 546 277 270 208 106 102
1 3,785 1,934 1,850 3,013 1,544 1,469 566 286 280 206 105 101
2 3,828 1,961 1,868 3,028 1,554 1,474 591 300 291 209 107 103
3 3,885 1,990 1,894 3,065 1,574 1,491 609 309 300 210 107 103
4 4,019 2,054 1,964 3,168 1,622 1,546 636 322 314 215 110 105
                         
5-9 19,441 9,954 9,487 15,361 7,879 7,482 3,093 1,569 1,524 988 507 481
5 4,046 2,072 1,974 3,193 1,638 1,555 638 324 315 215 110 105
6 4,020 2,058 1,962 3,186 1,634 1,552 633 322 312 201 103 98
7 3,876 1,984 1,892 3,052 1,565 1,487 630 319 311 194 100 94
8 3,645 1,865 1,780 2,881 1,476 1,404 578 293 285 186 95 91
9 3,853 1,975 1,878 3,050 1,565 1,484 612 311 301 191 98 93
                         
10-14 18,981 9,727 9,254 15,077 7,744 7,334 2,905 1,475 1,430 998 508 490
10 3,862 1,982 1,880 3,070 1,579 1,492 595 302 292 196 101 96
11 3,798 1,946 1,853 3,027 1,554 1,474 578 293 285 193 99 95
12 3,688 1,887 1,800 2,922 1,499 1,423 567 288 280 199 101 98
13 3,803 1,947 1,856 3,020 1,550 1,471 575 292 283 208 105 102
14 3,830 1,965 1,865 3,038 1,562 1,475 591 300 290 202 103 99
                         
15-19 18,573 9,545 9,028 14,768 7,617 7,150 2,888 1,463 1,425 917 465 452
15 3,789 1,948 1,841 3,000 1,546 1,453 588 299 288 202 102 99
16 3,822 1,973 1,849 3,032 1,569 1,463 600 307 293 190 97 93
17 3,727 1,930 1,797 2,959 1,537 1,422 583 298 285 185 94 90
18 3,546 1,819 1,728 2,835 1,461 1,374 546 275 272 165 83 82
19 3,688 1,875 1,813 2,942 1,504 1,438 570 283 287 176 88 88
                         
19-24 17,167 8,662 8,505 13,700 6,961 6,739 2,523 1,227 1,296 944 473 471
20 3,492 1,773 1,719 2,793 1,426 1,367 523 258 265 176 89 87
21 3,458 1,752 1,706 2,761 1,406 1,355 512 252 260 184 93 91
22 3,287 1,659 1,628 2,624 1,333 1,290 479 233 246 184 92 92
23 3,329 1,674 1,655 2,646 1,342 1,305 491 237 255 191 96 96
24 3,601 1,805 1,796 2,876 1,454 1,422 517 247 270 208 103 105
                         
25-29 18,733 9,302 9,432 15,130 7,589 7,542 2,546 1,201 1,345 1,057 512 545
25 3,825 1,905 1,920 3,070 1,542 1,528 534 254 281 221 110 112
26 3,801 1,886 1,915 3,072 1,538 1,534 512 242 270 217 106 111
27 3,720 1,849 1,871 3,018 1,515 1,502 490 231 259 212 102 110
28 3,472 1,720 1,752 2,813 1,409 1,404 468 220 249 191 91 100
29 3,915 1,941 1,974 3,158 1,584 1,574 542 254 288 215 103 112
 
30-34 21,135 10,453 10,682 17,306 8,657 8,649 2,763 1,282 1,481 1,066 514 552
30 3,934 1,944 1,990 3,185 1,592 1,593 539 251 288 209 100 109
31 4,078 2,014 2,064 3,325 1,662 1,664 542 252 290 211 101 110
32 4,249 2,099 2,149 3,484 1,741 1,743 550 254 295 215 104 111
33 4,312 2,126 2,186 3,552 1,771 1,781 547 252 294 213 103 111
34 4,562 2,269 2,293 3,759 1,891 1,868 585 272 313 218 106 112
                         
35-39 22,395 11,096 11,299 18,559 9,297 9,262 2,796 1,299 1,497 1,040 500 540
35 4,542 2,251 2,292 3,755 1,881 1,874 568 263 304 220 106 113
36 4,478 2,218 2,260 3,711 1,859 1,852 560 259 301 208 100 108
37 4,464 2,208 2,256 3,695 1,848 1,846 562 260 302 208 100 108
38 4,220 2,086 2,135 3,515 1,756 1,759 514 238 276 191 91 100
39 4,690 2,334 2,355 3,883 1,953 1,930 593 278 315 213 103 110
                         
40-44 20,732 10,235 10,497 17,319 8,648 8,671 2,465 1,141 1,324 947 446 501
40 4,379 2,165 2,214 3,633 1,816 1,817 540 250 289 206 98 108
41 4,244 2,096 2,148 3,534 1,766 1,768 512 236 276 198 94 104
42 4,119 2,031 2,088 3,448 1,719 1,729 486 225 261 185 88 98
43 3,963 1,946 2,017 3,311 1,646 1,666 460 212 249 191 89 102
44 4,028 1,997 2,030 3,394 1,702 1,692 467 218 250 166 78 89
                         
45-49 18,406 9,033 9,373 15,618 7,753 7,865 1,993 909 1,084 795 371 424
45 3,770 1,856 1,914 3,161 1,575 1,585 438 201 237 171 80 91
46 3,634 1,786 1,848 3,060 1,523 1,537 412 188 224 162 75 87
47 3,594 1,757 1,836 3,022 1,496 1,526 407 185 222 165 77 88
48 3,408 1,665 1,743 2,920 1,443 1,478 345 156 189 142 66 76
49 4,001 1,969 2,032 3,455 1,717 1,738 391 179 212 155 73 82
                         
50-54 13,928 6,771 7,157 11,947 5,868 6,079 1,413 633 780 568 270 298
50 2,828 1,379 1,449 2,404 1,185 1,219 293 132 161 131 63 69
51 2,787 1,358 1,429 2,380 1,172 1,208 288 130 159 119 56 63
52 2,769 1,345 1,424 2,383 1,170 1,213 276 124 153 109 52 58
53 2,936 1,426 1,510 2,552 1,252 1,300 279 125 154 105 50 55
54 2,607 1,262 1,345 2,228 1,090 1,138 276 123 153 103 49 54
                         
55-59 11,361 5,454 5,907 9,762 4,738 5,025 1,163 510 653 436 207 229
55 2,407 1,159 1,248 2,052 998 1,054 256 114 142 98 47 51
56 2,346 1,127 1,218 2,012 979 1,033 244 106 138 89 42 47
57 2,327 1,116 1,210 1,998 969 1,029 241 106 135 88 42 46
58 2,135 1,022 1,112 1,849 895 954 208 91 117 77 36 41
59 2,148 1,029 1,119 1,850 896 954 214 94 121 83 39 44
                         
60-64 9,999 4,711 5,288 8,652 4,125 4,526 995 427 568 352 158 194
60 2,078 980 1,098 1,792 854 937 209 90 119 77 36 41
61 2,061 978 1,083 1,792 861 930 198 85 114 71 33 39
62 1,921 907 1,014 1,656 791 865 195 84 110 70 32 39
63 1,942 916 1,025 1,684 804 879 191 82 109 67 30 37
64 1,997 929 1,068 1,729 815 914 202 86 116 67 29 38
                         
65-69 9,892 4,507 5,384 8,667 3,985 4,683 929 398 532 295 125 170
65 2,044 944 1,100 1,771 828 944 207 88 119 66 28 37
66 2,017 933 1,084 1,761 822 940 194 85 109 61 26 35
67 1,978 905 1,073 1,732 801 931 188 79 108 58 24 34
68 1,944 879 1,066 1,715 781 934 173 74 99 56 23 32
69 1,909 847 1,062 1,687 753 934 167 71 96 54 23 32
                         
70-74 8,778 3,818 4,960 7,844 3,434 4,410 704 285 419 229 99 131
70 1,839 811 1,028 1,624 722 902 163 67 96 52 22 30
71 1,827 800 1,027 1,633 720 913 147 60 87 48 21 27
72 1,780 780 1,000 1,597 705 892 135 54 81 48 21 27
73 1,664 715 949 1,491 644 847 130 52 78 43 18 25
74 1,668 711 956 1,499 643 856 129 51 78 39 17 22
                         
75-79 6,873 2,821 4,052 6,198 2,556 3,642 526 202 324 149 62 86
75 1,603 679 924 1,442 615 827 124 49 75 37 15 21
76 1,442 603 839 1,300 546 754 110 44 66 32 13 19
77 1,347 552 795 1,215 501 715 102 39 63 29 12 17
78 1,282 512 770 1,161 467 694 96 35 61 26 11 15
79 1,198 474 724 1,079 428 652 94 35 59 25 11 14
                         
80-84 4,557 1,666 2,892 4,150 1,520 2,631 320 109 211 87 37 50
80 1,081 415 665 984 380 604 75 26 49 21 9 12
81 1,003 376 627 914 344 571 70 24 46 19 8 11
82 904 329 575 824 301 524 63 21 42 17 7 10
83 838 295 544 763 268 494 60 20 40 16 7 9
84 731 251 481 664 227 438 53 18 35 14 6 8
                         
85-89 2,394 739 1,655 2,182 669 1,513 170 52 118 42 17 25
85 617 202 415 563 184 379 43 14 29 11 5 7
86 544 173 371 495 156 339 39 12 27 10 4 6
87 475 146 329 434 132 302 33 10 23 8 3 5
88 413 121 292 376 109 267 30 9 21 7 3 4
89 346 97 248 314 88 226 26 7 18 6 2 4
                         
90-94 1,024 261 763 923 231 692 82 22 60 19 7 12
90 291 78 213 264 70 193 22 6 16 5 2 3
91 253 65 187 227 58 169 21 6 15 5 2 3
92 202 50 151 182 45 137 16 4 12 4 1 2
93 159 38 121 143 34 109 13 4 10 3 1 2
94 119 28 91 107 25 83 9 2 7 2 1 2
 
95-99 286 60 226 254 51 202 27 7 20 6 2 4
95 102 23 79 90 19 70 10 3 8 2 1 1
96 72 15 56 63 13 50 7 2 5 2 1 1
97 50 10 40 45 9 36 4 1 3 1 0 1
98 36 7 29 32 6 26 3 1 2 1 0 1
99 27 5 22 24 4 19 2 1 2 1 0 0
                         
100+ 57 10 47 47 8 40 8 2 6 2 1 1
                         
0-14 57,708 29,549 28,159 45,727 23,461 22,266 8,946 4,539 4,408 3,035 1,549 1,486
15-44 118,734 59,292 59,442 96,782 48,770 48,012 15,981 7,613 8,368 5,971 2,909 3,061
45-64 53,694 25,969 27,725 45,979 22,484 23,495 5,564 2,479 3,085 2,151 1,006 1,145
                         
15+ 206,290 99,142 107,147 173,028 83,708 89,320 24,311 11,168 13,143 8,951 4,266 4,685
45+ 87,555 39,850 47,705 76,246 34,938 41,308 8,330 3,556 4,774 2,980 1,357 1,623
65+ 33,861 13,881 19,980 30,266 12,454 17,813 2,766 1,077 1,689 829 350 478
75+ 15,192 5,556 9,635 13,755 5,035 8,720 1,132 394 738 305 127 178
85+ 3,762 1,070 2,692 3,406 959 2,447 286 83 203 69 27 42
 



APPENDIX D



UNWEIGHTED AND WEIGHTED ESTIMATES FOR SELECTED NSAS VARIABLES





UNWEIGHTED N WEIGHTED ESTIMATE



SURVEY YEAR    
96 125,433 21,236,913
FACILITY TYPE    
1 = HOSPITAL 76,950 17,916,916
2 = FREESTANDING 48,483 3,319,997
UNITS FOR AGE    
1 = YEARS 123,764 21,054,628
2 = MONTHS 1,616 171,456
3 = DAYS 53 10,829
AGE GROUPS    
UNDER 15 14,915 1,774,324
15-44 35,117 6,440,689
45-64 31,646 5,882,069
65 & OVER 43,755 7,139,831
AGE FLAG    
1 = IMPUTED VALUE 614 126,787
2 = NO IMPUTATION 124,819 21,110,126
SEX    
1 = MALE 54,389 9,304,189
2 = FEMALE 71,044 11,932,724
SEX FLAG    
1 = IMPUTED VALUE 933 121,327
2 = NO IMPUTATION 124,500 21,115,586
RACE    
1 = WHITE 63,688 13,003,559
2 = BLACK 6,501 1,223,369
3 = AMIND/ESK/ALT 272 44,435
4 = ASIAN/PACISL 1,632 192,794
5 = OTHER 1,136 210,091
9 = NOT STATED 52,204 6,562,665
STATUS AT DISPOSITION  
1 = ROUTINE 115,019 19,090,255
2 = OBSERVATION STATUS 3,108 757,730
3 = RECOVERY CARE CTR 1,340 185,491
4 = INPATIENT ADMISSION 1,595 399,277
5 = SURGERY CANC/TERM 144 32,551
6 = OTHER 562 145,839
9 = NOT STATED 3,665 625,770
MONTH OF SURGERY    
01 = JANUARY 10,212 1,730,415
02 = FEBRUARY 10,142 1,745,564
03 = MARCH 10,514 1,821,931
04 = APRIL 11,119 1,904,785
05 = MAY 11,200 1,923,352
06 = JUNE 10,266 1,758,782
07 = JULY 10,758 1,830,425
08 = AUGUST 10,647 1,750,547
09 = SEPTEMBER 9,941 1,680,831
10 = OCTOBER 11,017 1,816,678
11 = NOVEMBER 9,939 1,640,753
12 = DECEMBER 9,678 1,632,850
REGION    
1 = NORTHEAST 26,405 4,612,713
2 = MIDWEST 28,058 5,377,620
3 = SOUTH 45,844 7,021,243
4 = WEST 25,126 4,225,337
PRINCIPAL EXPECTED SOURCE OF PAYMENT  
00 = NO CHARGE 692 91,473
01 = WORKERS COMP 2,865 485,710
02 = MEDICARE 39,826 6,572,537
03 = MEDICAID 8,530 1,320,669
04 = CHAMPUS 528 95,207
05 = OTHER GOVT 1,029 183,961
06 = BLUE CROSS 14,095 2,554,866
07 = HMO/PPO 19,836 3,645,498
08 = OTHER PRIVATE 25,728 4,213,419
09 = SELF PAY 3,635 528,601
10 = OTHER 1,909 333,594
99 = NOT STATED 6,760 1,211,378
FIRST-LISTED DIAGNOSIS  
VCODES 8,398 1,456,986
CHAPTER 1 574 100,639
CHAPTER 2 10,462 1,929,480
CHAPTER 3 1,081 151,166
CHAPTER 4 496 119,526
CHAPTER 5 142 23,995
CHAPTER 6 32,602 4,052,289
CHAPTER 7 3,910 1,015,821
CHAPTER 8 5,086 917,383
CHAPTER 9 18,383 3,512,901
CHAPTER 10 13,133 2,306,248
CHAPTER 11 1,399 229,990
CHAPTER 12 2,870 465,430
CHAPTER 13 11,337 2,062,377
CHAPTER 14 1,691 189,815
CHAPTER 15 13 2,399
CHAPTER 16 6,947 1,379,229
CHAPTER 17 6,909 1,321,239
ALL-LISTED PROCEDURES   32,266,752
CHAPTER 1   1,249,575
CHAPTER 2   37,294
CHAPTER 3   5,319,085
CHAPTER 4   847,949
CHAPTER 5   2,127,174
CHAPTER 6   440,275
CHAPTER 7   1,059,585
CHAPTER 8   167,445
CHAPTER 9   7,033,405
CHAPTER 10   1,473,423
CHAPTER 11   555,110
CHAPTER 12   2,037,569
CHAPTER 13   16,677
CHAPTER 14   4,320,869
CHAPTER 15   2,416,204
CHAPTER 16   3,165,113



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