HCUP National (Nationwide) Inpatient Sample (NIS) - Restricted Access File

Metadata Updated: April 25, 2021

The NIS is the largest publicly available all-payer inpatient care database in the United States. It contains data from approximately 8 million hospital stays each year. Restricted access data files are available with a data use agreement and brief online security training. The 2012 NIS was redesigned. The new NIS is a sample of discharges from all hospitals participating in HCUP. For prior years, the NIS was a sample of hospitals. The NIS allows for weighted national estimates to identify, track, and analyze national trends in health care utilization, access, charges, quality, and outcomes. The NIS is drawn from States participating in HCUP. NIS data are available since 1988, allowing analysis of trends over time. The NIS includes charge information for all patients, regardless of payer, including persons covered by Medicare, Medicaid, private insurance, and the uninsured. The NIS's large sample size enables analyses of rare conditions, such as congenital anomalies; uncommon treatments, such as organ transplantation; and special patient populations, such as the uninsured. The NIS contains clinical and resource use information included in a typical discharge abstract, with safeguards to protect the privacy of individual patients, physicians, and hospitals (as required by data sources). The NIS excludes data elements that could directly or indirectly identify individuals.

Access & Use Information

Restricted: This dataset can only be accessed or used under certain conditions. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Created Date November 10, 2020
Metadata Updated Date April 25, 2021

Metadata Source

Harvested from Healthdata.gov

Additional Metadata

Resource Type Dataset
Metadata Created Date November 10, 2020
Metadata Updated Date April 25, 2021
Publisher Agency for Healthcare Research and Quality, Department of Health & Human Services
Unique Identifier Unknown
Identifier bae01dec-8c8a-48c0-8d22-e0f85f2edd8e
Data First Published 2017-11-27
Data Last Modified 2021-03-12
Rights N/A
Category Health, Hospital, Inpatient
Public Access Level restricted public
Bureau Code 009:33
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://healthdata.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Data Quality True
Data Dictionary http://www.hcup-us.ahrq.gov/db/nation/nis/nisdde.jsp
Harvest Object Id 5b581c87-fd1f-4b95-8a75-81b920803302
Harvest Source Id 651e43b2-321c-4e4c-b86a-835cfc342cb0
Harvest Source Title Healthdata.gov
Homepage URL https://www.hcup-us.ahrq.gov/db/nation/nis/nisdbdocumentation.jsp
Program Code 009:072
Source Datajson Identifier True
Source Hash f367895c34532102bf9f6da16d06fd309be9c78f
Source Schema Version 1.1
Temporal 1988-01-01T00:00:00-05:00/2015-12-31T05:00:00-05:00

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