Description of NIS Files
- Introduction to the NIS
- 2020 (PDF file, 1.1 MB; HTML)
- 2019 (PDF file, 1.1 MB; HTML)
- 2018 (PDF file, 1.1 MB; HTML)
- 2017 (PDF file, 927 KB; HTML)
- 2016 (PDF file, 658 KB; HTML)
- 2015 (PDF file, 1.2 MB; HTML)
- 2014 (PDF file, 1.1 MB; HTML)
- 2013 (PDF file, 1.2 MB; HTML)
- 2012 (PDF file, 1.1 MB; HTML)
- 2011 (PDF file, 2.1 MB; HTML)
- 2010 (PDF file, 2.0 MB; HTML)
- 2009 (PDF file, 2.3 MB; HTML)
- 2008 (PDF file, 1.1 MB; HTML)
- 2007 (PDF file, 1.1 MB; HTML)
- 2006 (PDF file, 938 KB; HTML)
- 2005 (PDF file, 658 KB; HTML)
- 2004 (PDF file, 647 KB; HTML)
- 2003 (PDF file, 657 KB; HTML)
- 2002 (PDF file, 723 KB; HTML)
- 2001 (PDF file, 501 KB; HTML)
- 2000 (PDF file, 496 KB; HTML)
- 1999 (PDF file, 531 KB; HTML)
- 1998 (PDF file, 454 KB; HTML)
- 1997 (PDF file, 507 KB)
- 1996 (PDF file, 449 KB)
- 1995 (PDF file, 394 KB)
- 1994 (PDF file, 393 KB)
- 1993 (PDF file, 395 KB)
- 1988-1992 (PDF file, 443 KB)
- Sources of NIS Data and State-Specific Restrictions
- 2005 (PDF file, 116 KB; HTML)
- 2004 (PDF file, 115 KB; HTML)
- 2003 (PDF file, 167 KB; HTML)
- 2002 (PDF file, 160 KB)
- 2001 (PDF file, 279 KB)
- 2000 (PDF file, 260 KB)
- 1999 (PDF file, 34 KB)
- 1998 (PDF file, 32 KB)
- 1988-1997 (PDF file, 1,034 KB)
Description of Data Elements in the NIS
- NIS Severity Measures
- APS-DRGs Definition Manual Version 27 (PDF file, 615 KB)
- APS-DRGs Definition Manual Version 26 (PDF file, 586 KB)
- APS-DRGs Definition Manual Version 25 (PDF file, 459 KB)
- APS-DRGs Definition Manual Version 24 (PDF file, 289 KB)
- APS-DRGs Definition Manual Version 23 (PDF file, 476 KB)
- APS-DRGs Definition Manual Version 22 (PDF file, 239 KB)
- APS-DRGs Definition Manual Version 21 (PDF file, 175 KB)
- APS-DRGs Definition Manual Version 20 (PDF file, 160 KB)
- APS-DRGs Weights Manual Version 27 (PDF file, 285 KB)
- APS-DRGs Weights Manual Version 26 (PDF file, 292 KB)
- APS-DRGs Weights Manual Version 25 (PDF file, 293 KB)
- APS-DRGs Weights Manual Version 24 (PDF file, 257 KB)
- APS-DRGs Weights Manual - Version 23 (PDF file, 342 KB)
- APS-DRGs Weights Manual - Version 22 (PDF file, 251 KB)
- APS-DRGs Weights Manual - Version 21 (PDF file, 140 KB)
- APS-DRGs Weights Manual Version 20 (PDF file, 228 KB)
- APS-DRGs Weights Manual Version 31 (PDF file, 341 KB)
- APR-DRGs Methodology Overview Version 26 (PDF file, 481 KB)
- APR-DRGs Methodology Overview Version 25 (PDF file, 418 KB)
- APR-DRGs Methodology Overview - Version 24 (PDF file, 423 KB)
- APR-DRGs Methodology Overview - Version 20 (PDF file, 455 KB)
- Disease Staging V5.26 Reference Guide (PDF file, 526 KB)
- Disease Staging V5.25 Reference Guide (PDF file, 523 KB)
- Disease Staging V5.24 Reference Guide (PDF file, 523 KB)
- Disease Staging V5.27 Diagnostic Categories (PDF file, 4,072 KB)
- Disease Staging V5.26 Diagnostic Categories (PDF file, 6,561 KB)
- Disease Staging V5.25 Diagnostic Categories (PDF file, 7,696 KB)
- Disease Staging V5.24 Diagnostic Categories (PDF file, 9,230 KB)
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Description of Data Elements
Descriptions can be viewed as a single document (approximately 200+ pages long for the Core Data Elements and 60+ pages long for the Hospital File Data Elements).
The PDF versions of the data element descriptions were created when the databases were developed. Any updates to the data element descriptions are contained in the data element-specific notes.
Select to access a printable version of all data elements.
- NIS Core Data Elements
- 2004 NIS, Volume 1, letters A-M (PDF file, 2,521 KB)
- 2004 NIS, Volume 2, letters N-Z (PDF file, 2,278 KB)
- 2003 NIS, Volume 1, letters A-L (PDF file, 2,878 KB)
- 2003 NIS, Volume 2, letters M-Z (PDF file, 2,261 KB)
- 2002 NIS, Volume 1, letters A-L (PDF file, 1,736 KB)
- 2002 NIS, Volume 2, letters M-Z (PDF file, 2,252 KB)
- 2001 NIS (PDF file, 1,503 KB)
- 2000 NIS (PDF file, 1,634 KB), this file also applies to the 1998 and 1999 NIS, Version 2
- 1999 NIS, Version 1 (PDF file, 1,246 KB)
- 1998 NIS, Version 1 (PDF file, 1,289 KB)
- NIS Hospital Data Elements
- 2004 NIS (PDF file, 460 KB)
- 2003 NIS (PDF file, 565 KB)
- 2002 NIS (PDF file, 552 KB)
- 2001 NIS (PDF file, 469 KB)
- 2000 NIS (PDF file, 152 KB), this file also applies to the 1998 and 1999 NIS, Version 2
- 1999 NIS, Version 1 (PDF file, 80 KB)
- 1998 NIS, Version 1 (PDF file, 74 KB)
- NIS Severity Data Elements
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