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NIS Database Documentation
The National (Nationwide) Inpatient Sample (NIS) is the largest publically available all-payer inpatient care database in the United States, containing data on more than seven million hospital stays each year.
 
 
NIS Database Documentation

The National (Nationwide) Inpatient Sample (NIS) is the largest all-payer inpatient care database in the United States, containing data on more than seven million hospital stays. Its large sample size is ideal for developing national and regional estimates and enables analyses of rare conditions, uncommon treatments, and special populations.

The following links provide detailed documentation for the NIS, from a high-level Overview to all the detailed specifications, restrictions, and resources necessary for researchers working and publishing with the NIS.
 
Description of NIS Database Restrictions on Use File Specifications and Load Programs Data Elements Additional Resources for Data Elements   Information on the Redesign of the NIS in 2012 Known Data Issues NIS Supplemental Files HCUP Tools: Labels and Formats Obtaining HCUP Data

Internet Citation: HCUP NIS Database Documentation. Healthcare Cost and Utilization Project (HCUP). July 2016. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/nis/nisdbdocumentation.jsp.
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Last modified 7/14/16