Principal Investigator(s): United States Department of Health and Human Services. National Center for Health Statistics
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 1994 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. For the 1994 survey, data were collected from 260 OPDs and 418 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
These data are freely available.
U.S. Dept. of Health and Human Services, National Center for Health Statistics. NATIONAL HOSPITAL AMBULATORY MEDICAL CARE SURVEY, 1994. 2nd ICPSR release. Hyattsville, MD: U.S. Dept. of Health and Human Services, National Center for Health Statistics [producer], 1996. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1997. http://doi.org/10.3886/ICPSR06824.v2
Persistent URL: http://doi.org/10.3886/ICPSR06824.v2
Scope of Study
Subject Terms: ambulatory care, health care services, hospitalization, hospitals, emergency services, injuries, medical care, medical evaluation, medical procedures, medical records, patient care, patients, payment methods, surgery, treatment
Geographic Coverage: United States
Date of Collection:
Universe: Visits to the emergency and outpatient departments of noninstitutional general and short-stay 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. Excluded were federal hospitals, hospital units within institutions, and hospitals with less than six beds staffed for patient use.
Data Types: administrative records data
Data Collection Notes:
Per agreement with NCHS, ICPSR distributes the data file(s) and technical documentation in this collection in their original form as prepared by NCHS.
Sample: The NHAMCS used a four-stage probability design with samples of PSUs, hospitals within PSUs, clinics within hospitals, and patient visits within clinics.
patient visit records from hospital emergency departments and outpatient departments
Original ICPSR Release: 1996-12-19
- 2006-01-12 All files were removed from dataset 3 and flagged as study-level files, so that they will accompany all downloads.
- 1997-05-16 Corrections were made to the data for Part 2, Outpatient Department Data, so that the "year of visit" variable accurately reflects the year.
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