NIS Related Reports

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

Note: The NIS underwent a redesign for the 2012 data year. For more details, refer to the NIS Redesign Report. To do trends analysis using earlier data years, use NIS Trend Weights

NIS Related Reports

The following reports describe the design of the NIS, how the NIS compares to similar databases, and other information on how to use the NIS.

Use the Checklist for Working With the NIS to understand the role each of these reports may have in conducting effective, accurate research with the NIS.

Design of the NIS:

2012 NIS Redesign Report (PDF file, 2.0 MB; HTML)
Beginning in 2006, information on the NIS design is included in the Introduction to the NIS
2005 (PDF file, 256 KB; HTML)
2004 (PDF file, 273 KB; HTML)
2003 (PDF file, 273 KB; HTML)
2002 (PDF file, 313 KB; HTML)
2001 (PDF file, 473 KB; HTML)
2000 (PDF file, 712 KB; HTML)
1999 (PDF file, 233 KB; HTML)
1998 (PDF file, 670 KB; HTML)
1997 (PDF file, 65 KB; HTML)
1996 (PDF file, 1,024 KB; HTML)
1995 (PDF file, 1,001 KB; HTML)
1994 (PDF file, 961 KB; HTML)
1993 (PDF file, 940 KB; HTML)
1988-1992 (PDF file, 1,173 KB; HTML)

Changes in the NIS Sampling and Weighting Strategy for 1998 (PDF file, 1,275 KB)
Updated NIS Variance Report:

Calculating National Inpatient Sample (NIS) Variances for Data Years 2012 and Later (PDF file, 565 KB; HTML)
Calculating Nationwide Inpatient Sample (NIS) Variances for Data Years 2011 and Earlier (PDF file, 642 KB; HTML)
Correction to 1988-2000 Instruction on How to Calculate Variances (Standard Errors) (PDF file, 76 KB)

NIS Trends Report
- Using the HCUP Nationwide Inpatient Sample to Estimate Trends (PDF file, 518 KB)
- 1993-2011 NIS Trend Weights Files
- 1993-2002 NIS Supplemental Discharge-Level Files
Missing Data Methods Report
- Missing Data Methods for the NIS and the SID (PDF file, 542 KB)

NIS Comparison Report:

2012 (PDF file, 1.1 MB; HTML)
2007 (PDF file, 524 KB; HTML)
2005 (PDF file, 389 KB; HTML)
2004 (PDF file, 441 KB; HTML)
2003 (PDF file, 547 KB; HTML)
2002 (PDF file, 644 KB; HTML)
2001 (PDF file, 1,076 KB; HTML)
2000 (PDF file, 991 KB)
1999 (PDF file, 1,117 KB)
1997 (PDF file, 340 KB)
1995 (PDF file, 284 KB)
1993 (PDF file, 301 KB)
1988-1992 (PDF file, 436 KB)

HCUP Data Quality Reports:

2018 (PDF file, 111 KB)
2017 (PDF file, 112 KB)
2016 (PDF file, 115 KB)
2015 (PDF file, 115 KB)
2014 (PDF file, 115 KB)
2013 (PDF file, 115 KB)
2012 (PDF file, 114 KB)
2011 (PDF file, 115 KB)
2010 (PDF file, 115 KB)
2009 (PDF file, 116 KB)
2008 (PDF file, 116 KB)
2007 (PDF file, 116 KB)
2006 (PDF file, 12 KB)
2005 (PDF file, 12 KB)
2004 (PDF file, 11 KB)
2003 (PDF file, 6 KB)
2002 (PDF file, 10 KB)
2001 (PDF file, 10 KB)
2000 (PDF file, 10 KB)
1999 Version 1 (PDF file, 10 KB)
1999 Version 2 (PDF file, 10 KB)
1998 Version 1 (PDF file, 9 KB)
1998 Version 2 (PDF file, 10 KB)
1988-1997 (PDF file, 874 KB)

HCUP E Code Evaluation Report
- HCUP External Cause of Injury (E Code) Evaluation Report - Updated with 2013 HCUP Data
- Prior versions of the HCUP E Code Evaluation Report are available under HCUP Methods Series Reports

Internet Citation: NIS Related Reports. Healthcare Cost and Utilization Project (HCUP). November 2020. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/nis/nisrelatedreports.jsp.

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Last modified 11/4/20