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Skip Navigation U.S. Department of Health and Human Services
Agency for Healthcare Research Quality


AHRQ's HCUP 2006 Nationwide Inpatient Sample (NIS) now available

AHRQ's Healthcare Cost and Utilization Project (HCUP) Nationwide Inpatient Sample (NIS) featuring 2006 data was released in May. This inpatient care database includes all patients, regardless of payer—including people covered by Medicare, Medicaid, private insurance, and the uninsured. The data can be weighted to produce national estimates, allowing researchers and policymakers to use the NIS to identify, track, and analyze national trends in health care utilization, access, charges, quality, and outcomes.

As part of the HCUP database family, health services researchers consider the NIS one of the most reliable and affordable databases for studying important health care topics. Please go to for additional information about the NIS including how to purchase the data.

Data from the 2006 NIS can also be also accessed via HCUPnet (, the free online data query system.

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