NRD Database Documentation

The Nationwide Readmissions Database (NRD) is a unique and powerful database designed to support various types of analyses of national readmission rates for all patients regardless of the expected payer for the hospital stay. The NRD includes discharges for patients with and without repeat hospital visits in a year and those who have died in the hospital. Repeat stays may or may not be related. The criteria to determine the relationship between hospital admissions is left to the analyst using the NRD. This database addresses a large gap in healthcare data - the lack of nationally representative information on hospital readmissions for all ages.

The links below provide detailed documentation for the NRD, from a high-level Overview to all the detailed specifications, restrictions, and resources necessary for researchers working and publishing with the NRD.
Description of NRD Files 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 NRD Starting With 2015 Known Data Issues HCUP Tools: Labels and Formats Obtaining HCUP Data

Internet Citation: NRD Database Documentation. Healthcare Cost and Utilization Project (HCUP). December 2020. Agency for Healthcare Research and Quality, Rockville, MD.
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Last modified 12/1/20