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).

National Hospital Discharge Survey, 2006 (ICPSR 22745)

Principal Investigator(s):


The 2006 National Hospital Discharge Survey (NHDS) collects medical and demographic information annually from a sample of hospital discharge records. Variables include patients' demographic characteristics (sex, age, race, marital status), dates of admission and discharge, source and type of admission, status at discharge, final diagnoses, surgical and nonsurgical procedures, dates of surgeries, and sources of payment. Information on hospital characteristics such as bedsize, ownership, and region of the country is also included. The medical information is coded using the INTERNATIONAL CLASSIFICATION OF DISEASES, 9TH REVISION, CLINICAL MODIFICATION (ICD-9-CM).

Series: National Hospital Discharge Survey Series

Access Notes

  • These data are freely available.


WARNING: This study is over 150MB in size and may take several minutes to download on a typical internet connection.

NATIONAL HOSPITAL DISCHARGE SURVEY 2006 - Download All Files (318 MB) large dataset

Study Description


United States Department of Health and Human Services. National Center for Health Statistics. National Hospital Discharge Survey, 2006 [Computer File]. ICPSR22745-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2008-10-23.

Persistent URL:

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Scope of Study

Subject Terms:   health care facilities, hospitalization, hospitals, illness, medical care, medical evaluation, medical procedures, medical records, patients

Geographic Coverage:   United States

Time Period:  

  • 2006

Date of Collection:  

  • 2006

Universe:   Patient discharges from nonfederal short-stay hospitals located in the 50 states and the District of Columbia.

Data Types:   administrative records data, survey data

Data Collection Notes:

Detailed information regarding ICD-9 codes can be found in the documentation.


Sample:   In 2006, the sample consisted of 501 hospitals. Of the 501 hospitals, 23 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 478 in-scope (eligible) hospitals, 438 hospitals responded to the survey.

Weight:   These data contain one weight variable, weight. Users should refer to the technical documentation for further information regarding the weight and its derivation. Additionally, users may need to weigh the data prior to analysis.

Data Source:

hospital records

Extent of Processing:  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:

  • Performed consistency checks.
  • Standardized missing values.


Original ICPSR Release:  

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