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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.
 

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The National (Nationwide) Inpatient Sample (NIS)

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.
 
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). July 2014. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/nis/nisdbdocumentation.jsp.
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Last modified 7/18/14