National Hospital Ambulatory Medical Care Survey, 1992 (ICPSR 6585)

Published: Jan 18, 2006

Principal Investigator(s):
United States Department of Health and Human Services. National Center for Health Statistics


Version V1

The National Hospital Ambulatory Medical Care Survey (NHAMCS) was inaugurated in 1992 to fill a gap in data about ambulatory medical care in the United States. Although the National Ambulatory Medical Care Survey (NAMCS) collects annual data on patient visits to physician offices, it excludes the hospital emergency room and outpatient department visits that make up a large part of the total ambulatory care received each year. The 1992 NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. Between December 2, 1991, and December 27, 1992, data were collected from 314 OPDs and 437 EDs. Among the variables included are age, race, and sex of the patient, along with the reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.

United States Department of Health and Human Services. National Center for Health Statistics. National Hospital Ambulatory Medical Care Survey, 1992. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2006-01-18.

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1991-12-02 -- 1992-12-27


Per agreement with NCHS, ICPSR distributes the data file(s) and technical documentation in this collection in their original form as prepared by NCHS.

The NHAMCS used a four-stage probability design with samples of primary sampling units (PSUs), hospitals within PSUs, clinics within hospitals, and patient visits within clinics.

The 1992 NHAMCS included a national probability sample of visits to the emergency and outpatient departments of noninstitutional general and short-stay hospitals. Hospitals within the 50 states and the District of Columbia that had an average length of stay of less than 30 days, or hospitals whose specialty was general (medical or surgical) or children's general were eligible for the NHAMCS. Excluded were federal hospitals, hospital units within institutions, and hospitals with less than six beds staffed for patient use.

patient visit records from hospital emergency departments and outpatient departments

administrative records data



2006-01-18 File CB6585.ALL.PDF was removed from any previous datasets and flagged as a study-level file, so that it will accompany all downloads.


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This study is maintained and distributed by the National Archive of Computerized Data on Aging (NACDA), the aging program within ICPSR. NACDA is sponsored by the National Institute on Aging (NIA) at the National Institutes of Heath (NIH).