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NIS Database Documentation
The NIS is a set of longitudinal hospital inpatient databases included in the HCUP family. These databases are created by AHRQ through a Federal-State-Industry partnership.
The Nationwide Inpatient Sample (NIS)

The Nationwide Inpatient Sample (NIS) is the largest all-payer inpatient care database in the United States, containing data on more than eight million hospital stays from over 1,000 hospitals. 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.
Description of NIS Files Restrictions on the Use of the NIS Load Programs NIS Data Elements Additional Resources for NIS Data Elements   Known Data Issues HCUP Tools: Labels and Formats NIS Related Reports and Supplemental Files

Internet Citation: HCUP NIS Database Documentation. Healthcare Cost and Utilization Project (HCUP). December 2013. Agency for Healthcare Research and Quality, Rockville, MD.
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Last modified 12/11/13