The 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.
The following links provide data elements descriptions for the Nationwide Readmissions Database (NRD).
Data element descriptions explain how the data element is coded in the HCUP databases, and what are the uniform values. The descriptions are cumulative across all years of the NRD. Please note the following:
Not all data elements in the NRD are uniformly coded across States.
Not all data elements are available each year.
For certain data elements such as, but not limited to, total charges (TOTCHG), more than one percent of NRD records have missing values. Users are advised to review frequencies for all data elements planned for use in their analysis and to consider analytic methods for dealing with missing data. The HCUP Methods Series Report #2015-01 provides guidance on alternative approaches to handling missing data.
The NRD are calendar year files based on discharge date for all data years except 2015. Because of the transition to ICD-10-CM/PCS on October 1, 2015, data elements related to diagnoses and procedures are included in files that are split into two parts. Nine months of the 2015 data with ICD-9-CM codes (discharges from January 1, 2015 - September 30, 2015) are in one set of files labeled Q1Q3. Three months of 2015 data with ICD-10-CM/PCS codes (discharges from October 1, 2015 - December 31, 2015) are in a separate set of files labeled Q4. All NRD data elements are listed in alphabetical order below, showing the NRD file location for years other than 2015 and for 2015. More information about the changes to the HCUP databases for ICD-10-CM/PCS and use of data across the two-coding systems may be found on the HCUP-US Web site under ICD-10-CM/PCS Resources.
The file structure of the 2016 NRD is similar to the file structure of the NRD prior to 2015 with one exception, data elements derived from AHRQ software tools are not available in the 2016 NRD because the ICD-10-CM/PCS versions are still under development. For users interested in applying the AHRQ software tools to the ICD-10-CM/PCS data in the 2016 NRD, beta versions of the AHRQ software tools are available for download on the HCUP Tools & Software section of the HCUP-US Web site. A tutorial is available to users interested in applying the AHRQ software tools to the 2016 NRD at www.hcup-us.ahrq.gov/tech_assist/tutorials.jsp.
For a description of how HCUP data elements are coded, and uniform values, check the corresponding boxes below and then click the "View Description of Data Elements".
Internet Citation: NRD Description of Data Elements.
Healthcare Cost and Utilization Project (HCUP). August 2018.
Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/nrd/nrddde.jsp.