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Nationwide Readmissions Database

Alternate Titles(s): NRD, HCUP Nationwide Readmissions Database

UID: 167

The Nationwide Readmissions Database is part of the Healthcare Cost and Utilization Project (HCUP) family of databases. The NRD is derived from the HCUP State Inpatient Databases (SID), and aims to provide nationally represenative data to support hospital readmission analyses. The NRD includes all-payer inpatient discharges from HCUP partner community hospitals in the SID which have verifiable patient linkage numbers. These synthetic linkage numbers allow analysts to track patients across hospital stays, while maintaining patient privacy. The NRD contains over 14 million discharge records per data year from about 85% of SID discharges from participating states. The 122 data elements in the NRD include diagnostic and procedure codes, and hospital characteristics. The data cannot be used to track readmissions across states or across data years or used for state-, facility-, or physician-level analyses.
2010 - Present
Geographic Coverage
United States
Local Experts
Subject of Study
Subject Domain
Population Age
Adult (19 years to 64 years)
Child (2 years to 12 years)
Senior (65 years to 79 years)
Adolescent (13 years to 18 years)
Elderly (80 years and over)
Infant (1 to 23 months of age)
Infant, Newborn (first 28 days after birth)
Subject Gender
Access via HCUP Central Distributor

zipped csv files, supplemental files, and documentation

Access Restrictions
Fee required
Registration required
Access Instructions
Dataset must be purchased through the Online HCUP Central Distributor: Purchasers and users must complete the Data Use Agreement Training and sign the DUA.
Data Type
Dataset Format(s)
Dataset Size
2GB zipped, 20GB unzipped per data year
PubMed Search
View articles which use this dataset
Other Resources
NRD Database Documentation

More information about the NRD including overview, restrictions, file specifications, SPSS, SAS, and STATA load programs, data element descriptions, and summary statistics.

NRD Description of Data Elements

Full descriptions of variables available in the NRD

HCUP Online Tutorial Series

On-line tutorials for working with HCUP data

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