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NRD Database Documentation
The HCUP Nationwide Readmissions Database (NRD) is a set of inpatient databases in the HCUP family designed for readmission analyses. These HCUP databases are created by AHRQ through a Federal-State-Industry partnership.
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 payers and the uninsured. 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 health care 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, 290 KB; HTML)
  • HCUP Coding Practices (PDF file, 16 KB; HTML)
  • HCUP Hospital Identifiers (PDF file, 82 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). September 2019. Agency for Healthcare Research and Quality, Rockville, MD.
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Last modified 9/18/19