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National Hospital Ambulatory Medical Care Survey, 2001

Resource Type
Dataset : administrative records data
  • United States Department of Health and Human Services. National Center for Health Statistics
Other Title
  • Archival Version (Subtitle)
Collective Title
  • National Hospital Ambulatory Medical Care Survey Series
Publication Date
Free Keywords
ambulatory care; emergency services; health care services; hospitalization; hospitals; injuries; medical care; medical evaluation; medical procedures; medical records; patient care; patients; payment methods; surgery; treatment
  • Abstract

    The 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 2001 survey, data were collected from 224 OPDs and 364 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.
  • Methods

    ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection: Created online analysis version with question text..
  • Table of Contents


    • DS0: Study-Level Files
    • DS1: Emergency Department Data
    • DS2: Outpatient Department Data
Temporal Coverage
  • 2001-01-01 / 2001-12-27
    Time period: 2001-01-01--2001-12-27
  • Collection date: 2001
Geographic Coverage
  • United States
Sampled 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.
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.
Collection Mode
  • (1) Per agreement with NCHS, ICPSR distributes the data files and text of the technical documentation for this collection as prepared by NCHS. (2) The codebook is provided by the principal investigator as a Portable Document Format (PDF) file. The PDF file format was developed by Adobe Systems Incorporated and can be accessed using PDF reader software, such as the Adobe Acrobat Reader. Information on how to obtain a copy of the Acrobat Reader is provided on the ICPSR Web site.

2006-01-18 File CB3813.ALL.PDF was removed from any previous datasets and flagged as a study-level file, so that it will accompany all downloads.
This version of the study is no longer available on the web. If you need to acquire this version of the data, you have to contact ICPSR User Support (
Alternative Identifiers
  • 3813 (Type: ICPSR Study Number)
  • Is previous version of
    DOI: 10.3886/ICPSR03813.v1
  • Cohen, Donna, Coco, Andrew. Do physicians address other medical problems during preventive gynecologic visits?. Journal of the American Board of Family Medicine.27, (1), 13-18.2014.
    • ID: 10.3122/jabfm.2014.01.130045 (DOI)
  • Chirdkiatgumchai, Vilawan, Xiao, Hong, Fredstrom, Bridget K., Adams, Ryan E., Epstein, Jeff N., Shah, Samir S., Brinkman, William B., Kahn, Robert S., Froehlich, Tanya E.. National trends in psychotropic medication use in young children: 1994-2009. Pediatrics.132, (4), 615-623.2013.
    • ID: 10.1542/peds.2013-1546 (DOI)
  • Ewigman, Nate L., Gylys, Julius A., Harman, Jeffrey S.. The diagnosis of anger as a presenting complaint in outpatient medical settings. Psychiatric Services.64, (9), 921-924.2013.
    • ID: 10.1176/ (DOI)
  • Goyal, Monika, Hersh, Adam, Luan, Xianqun, Localio, Russell, Trent, Maria, Zaoutis, Theoklis. Are emergency departments appropriately treating adolescent pelvic inflammatory disease?. JAMA Pediatrics.167, (7), 672-673.2013.
    • ID: 10.1001/jamapediatrics.2013.1042 (DOI)
  • Gupta, M.A., Gupta, A.K., Fink, N.H.. Polypharmacy in dermatology: Analysis of a nationally representative sample of 46,273 dermatology patient visits in the United States from 1995-2009. Skinmed.11, (5), 273-280.2013.
  • Haggins, Adrianne, Patrick, Stephen, Demonner, Sonya, Davis, Matthew M.. When coverage expands: Children's Health Insurance Program as a natural experiment in use of health care services. Academic Emergency Medicine.20, (10), 1026-1032.2013.
    • ID: 10.1111/acem.12236 (DOI)
  • Koelblinger, P. Dabade, T.S., Gustafson, C.J., Davis, S.A., Yentzer, B.A., Kiracofe, E.A., Feldman, S.R.. Skin manifestations of outpatient adverse drug events in the United States: A national analysis. Journal of Cutaneous Medicine and Surgery.17, (4), 269-275.2013.
  • Ladapo, Joseph A.. Physician decision-making and trends in use of cardiac stress testing to diagnose coronary heart disease in the United States. 35th Annual Meeting of the Society for Medical Decision Making.Baltimore, MD. 2013.
  • Lin, Kirk K., Sewell, Justin L.. The effects of race and socioeconomic status on immunomodulator and anti-tumor necrosis factor use among ambulatory patients with inflammatory bowel disease in the United States. American Journal of Gastroenterology.108, 1824-1830.2013.
    • ID: 10.1038/ajg.2013.192 (DOI)
  • Mafi, Johh N., McCarthy, Ellen P., Davis, Roger B., Landon, Bruce E.. Worsening trends in the management and treatment of back pain. JAMA Internal Medicine.173, (17), 1573-1581.2013.
    • ID: 10.1001/jamainternmed.2013.8992 (DOI)
  • Manseau, Marc, Case, Brady G.. Racial-ethnic disparities in outpatient mental health visits to US physicians, 1993-2008. Psychiatric Services.2013.
    • ID: 10.1176/ (DOI)
  • Meddles-Torres, Cheryl, Hu, Shuang, Jurgens, Corrine. Changes in prescriptive practices in skin and soft tissue infections associated with the increased occurrence of community acquired methicillin resistant Staphylococcus aureus. Journal of Infection and Public Health.6, (6), 423-430.2013.
    • ID: 10.1016/j.jiph.2013.04.010 (DOI)
  • Simon, A.E., Marsteller, J.A., Lin, S.X.. Physician-patient race concordance from the physician perspective. Journal of the National Medical Association.105, (2), 150-156.2013.
  • Akinbami, Lara J., Bailey, Cathy M., Johnson, Carol A., King, Michael E., Liu, Xiang, Moorman, Jeanne E., Zahran, Hatice S.. National Surveillance of Asthma: United States, 2001-2010. Vital and Health Statistics.35, Hyattsville, Maryland: United States Department of Health and Human Services, Center for Disease Control and Prevention, National Center for Health Statistics. 2012.
    • ID: (URL)
  • Barnett, Michael L., Song, Zirui, Landon, Bruce E.. Trends in physician referrals in the united states, 1999-2009. Archives of Internal Medicine.172, (2), 163-170.2012.
    • ID: 10.1001/archinternmed.2011.722 (DOI)
  • Fairlie, Taryn, Shapiro, Daniel J., Hersh, Adam L., Hicks, Lauri A.. National trends in visit rates and antibiotic prescribing for adults with acute sinusitis. Archives of Internal Medicine.172, (19), 1513-1514.2012.
    • ID: 10.1001/archinternmed.2012.4089 (DOI)
  • Frank, Joseph W., Ayanian, John Z., Linder, Jeffrey, A.. Management of substance use disorders in ambulatory care in the United States, 2001-2009. Archives of Internal Medicine.172, (22), 1759-1760.2012.
    • ID: 10.1001/archinternmed.2012.4504 (DOI)
  • Shapiro, Daniel J., Hersh, Adam L., Cabana, Michael D., Sutherland, Scott M., Patel, Anisha I.. Hypertension screening during ambulatory pediatric visits in the United States, 2000-2009. Pediatrics.130, (4), 604-610.2012.
    • ID: 10.1542/peds.2011-3888 (DOI)
  • Wisniewski, Angela M., Purdy, Christopher H., Blondell, Richard D.. The epidemiologic association between opioid prescribing, non-medical use, and emergency department visits. Journal of Addictive Diseases.27, (1), 1-11.2008.
    • ID: 10.1300/J069v27n01_01 (DOI)
  • Cohen, Jacqueline. Alternative Data Sources for the Study of Assault. Part 2 of Final Report to National Institute of Justice.. 2004.
    • ID: (URL)
  • Cunningham, Peter, May, Jessica. Insured Americans Drive Surge in Emergency Department Visits. Issue Brief: Findings from HSC.70, Washington, DC: Center for Studying Health System Change. 2003.
    • ID: (URL)
  • McCaig, L.F., McLemore, T.. Plan and Operation of the National Hospital Ambulatory Medical Care Survey. Vital and Health Statistics, Series 1: Programs and Collection Procedures.34, Hyattsville, MD: United States Department of Health and Human Services, National Center for Health Statistics. 1994.

Update Metadata: 2015-08-05 | Issue Number: 6 | Registration Date: 2015-06-15

United States Department of Health and Human Services. National Center for Health Statistics (2003): National Hospital Ambulatory Medical Care Survey, 2001. Archival Version. National Hospital Ambulatory Medical Care Survey Series. Version: v0. ICPSR - Interuniversity Consortium for Political and Social Research. Dataset.