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, 383 KB; HTML)
  • 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 Obtaining HCUP Data

Internet Citation: NEDS Database Documentation. Healthcare Cost and Utilization Project (HCUP). November 2020. Agency for Healthcare Research and Quality, Rockville, MD.
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Last modified 11/12/20