The Healthcare Cost and Utilization Project (HCUP) announces release of the 2015 National Inpatient Sample (NIS). The NIS can be used by researchers and policymakers to identify, track, and analyze national trends in health care utilization, access, charges, quality, and outcomes. The vast size of the NIS enables analyses of infrequent conditions, uncommon treatments, and special patient populations.
Following the transition to ICD-10-CM/PCS on October 1, 2015, the file structure of the 2015 NIS has changed. Users are encouraged to review the ICD-10-CM/PCS Resources Page prior to analyzing outcomes affected by this change in the ICD coding scheme. To signify the change in the data, the file structure of the 2015 NIS differs from the annual files for other data years. In the 2015 NIS, the first three quarters of data (with ICD-9-CM codes) are stored separately from the fourth quarter of data (with ICD-10-CM/PCS codes). In addition, the names of diagnosis- and procedure-related data elements under ICD-10-CM/PCS have been changed to identify the coding scheme. Data elements based on the HCUP Tools that are derived from ICD-10-CM/PCS codes are not included in the fourth quarter data, but beta version of the programs to assign the HCUP Tools are available for download on the HCUP Tools & Software section of the HCUP-US Web site.
The 2015 NIS can be purchased through the HCUP Central Distributor. Additional information is located on the NIS Overview Page.