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NEDS Database Documentation

Nationwide Emergency Department Sample (NEDS) Database Documentation

The Nationwide Emergency Department Sample (NEDS) produces national estimates about emergency department (ED) visits across the country. The NEDS describes ED visits, regardless of whether they result in admission. One of the most distinctive features of the NEDS is its large sample size, which allows for analysis across hospital types and the study of relatively uncommon disorders and procedures.

The links below provide detailed documentation for the NEDS, from a high-level Overview to all the detailed specifications, restrictions, and resources necessary for researchers working and publishing with the NEDS.
Description of NEDS Database Restrictions on Use File Specifications and Load Programs
Data Elements
Additional Resources for Data Elements
  • HCUP Quality Control Procedures (PDF file, 1.1 MB)
  • HCUP Coding Practices (PDF file, 138 KB; HTML)
  • HCUP Hospital Identifiers (PDF file, 162 KB; HTML)
  ICD-10-CM/PCS Data Included in the NEDS Starting With 2015 Known Data Issues
HCUP Tools: Labels and Formats
  • Format Programs
    • DRG Formats Program (TXT file, 1.6 MB) Creates SAS formats to label the values of each DRG and MDC category
    • HCUP Formats Program (TXT file, 108 KB) Creates SAS formats to label the values of selected categorical data elements in HCUP files
    • HCUP Diagnosis and Procedure Groups Formats Program (TXT file, 61 KB) Creates SAS formats to label the values of HCUP Diagnosis and Procedure Groups data elements, including Clinical Classifications Software Refined (CCSR) data elements
    • ICD-9-CM Formats Program (TXT file, 910 KB) Creates SAS formats to label the values of ICD-9-CM Diagnoses and Procedures
    • ICD-10-CM Formats Program (TXT file, 12.3 MB) Creates SAS formats to label the values of ICD-10-CM Diagnoses and Procedures
Obtaining HCUP Data

Internet Citation: NEDS Database Documentation. Healthcare Cost and Utilization Project (HCUP). March 2024. Agency for Healthcare Research and Quality, Rockville, MD.
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Last modified 03/21/24