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NIS Summary Statistics

The following links provide summary statistics for the National (Nationwide) Inpatient Sample (NIS). Summary Statistics include means on all numeric variables, frequency distributions, and univariates on continuous variables. Summary statistics are provided by year.

Contents:

2021 NIS

SumStats NIS 2021 Core File, unweighted (PDF file, 297 KB)
SumStats NIS 2021 Core Weighted (PDF file, 277 KB)
SumStats NIS 2021 Hospital Weights File (PDF file, 170 KB)
SumStats NIS 2021 Severity File (PDF file, 156 KB)
SumStats NIS 2021 Diagnosis and Procedure Groups File (PDF file, 150 KB)

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2020 NIS

SumStats NIS 2020 Core V2 File, unweighted (PDF file, 292 KB)
SumStats NIS 2020 Core V2 Weighted (PDF file, 277 KB)
SumStats NIS 2020 Hospital Weights V2 File (PDF file, 167 KB)
SumStats NIS 2020 Severity V2 File (PDF file, 153 KB)
SumStats NIS 2020 Diagnosis and Procedure Groups V2 File (PDF file, 148 KB)

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2019 NIS

SumStats NIS 2019 Core V2 File, unweighted (PDF file, 290 KB)
SumStats NIS 2019 Core V2 Weighted (PDF file, 270 KB)
SumStats NIS 2019 Hospital Weights V2 File (PDF file, 167 KB)
SumStats NIS 2019 Severity V2 File (PDF file, 153 KB)
SumStats NIS 2019 Diagnosis and Procedure Groups V2 File (PDF file, 148 KB)

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2018 NIS

SumStats NIS 2018 Core File, unweighted (PDF file, 279 KB)
SumStats NIS 2018 Core Weighted (PDF file, 261 KB)
SumStats NIS 2018 Hospital Weights File (PDF file, 168 KB)
SumStats NIS 2018 Severity File (PDF file, 154 KB)
SumStats NIS 2018 Diagnosis and Procedure Groups File (PDF file, 235 KB)

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2017 NIS

SumStats NIS 2017 Core File, unweighted (PDF file, 307 KB)
SumStats NIS 2017 Core Weighted (PDF file, 283 KB)
SumStats NIS 2017 Hospital Weights File (PDF file, 180 KB)
SumStats NIS 2017 Severity File (PDF file, 158 KB)

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2016 NIS

SumStats NIS 2016 Core File, unweighted (PDF file, 309 KB)
SumStats NIS 2016 Core Weighted (PDF file, 284 KB)
SumStats NIS 2016 Hospital Weights File (PDF file, 180 KB)
SumStats NIS 2016 Severity File (PDF file, 158 KB)

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2015 NIS

SumStats NIS 2015 Core File, unweighted (PDF file, 207 KB)
SumStats NIS 2015 Core Weighted (PDF file, 178 KB)
SumStats NIS 2015 Q1Q3 DX_PR_Group File (PDF file, 324 KB)
SumStats NIS 2015 Q4 DX_PR_Group File (PDF file, 221 KB)
SumStats NIS 2015 Hospital Weights File (PDF file, 180 KB)
SumStats NIS 2015 Q1Q3 Severity File (PDF file, 222 KB)
SumStats NIS 2015 Q4 Severity File (PDF file, 158 KB)

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2014 NIS

SumStats NIS 2014 Core File, unweighted (PDF file, 397 KB)
SumStats NIS 2014 Core Weighted (PDF file, 360 KB)
SumStats NIS 2014 DX_PR_Group File (PDF file, 140 KB)
SumStats NIS 2014 Hospital Weights File (PDF file, 180 KB)
SumStats NIS 2014 Severity File (PDF file, 224 KB)

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2013 NIS

SumStats NIS 2013 Core File, unweighted (PDF file, 391 KB)
SumStats NIS 2013 Core Weighted (PDF file, 355 KB)
SumStats NIS 2013 DX_PR_Group File (PDF file, 139 KB)
SumStats NIS 2013 Hospital Weights File (PDF file, 180 KB)
SumStats NIS 2013 Severity File (PDF file, 224 KB)

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2012 NIS

SumStats NIS 2012 Core File, unweighted (PDF file, 376 KB)
SumStats NIS 2012 Core Weighted (PDF file, 343 KB)
SumStats NIS 2012 DX_PR_Group File (PDF file, 138 KB)
SumStats NIS 2012 Hospital Weights File (PDF file, 179 KB)
SumStats NIS 2012 Severity File (PDF file, 226 KB)

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2011 NIS

SumStats NIS 2011 Core File, unweighted (PDF file, 291 KB)
SumStats NIS 2011 Core Weighted (PDF file, 268 KB)
SumStats NIS 2011 DX_PR_Group File (PDF file, 50 KB)
SumStats NIS 2011 Hospital Weights File (PDF file, 105 KB)
SumStats NIS 2011 Severity File (PDF file, 122 KB)

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2010 NIS

SumStats NIS 2010 Core File, unweighted (PDF file, 258 KB)
SumStats NIS 2010 Core Weighted (PDF file, 240 KB)
SumStats NIS 2010 DX_PR_Group File (PDF file, 49 KB)
SumStats NIS 2010 Hospital Weights File (PDF file, 93 KB)
SumStats NIS 2010 Severity File (PDF file, 161 KB)

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2009 NIS

SumStats NIS 2009 Core File, unweighted (PDF file, 265 KB)
SumStats NIS 2009 Core Weighted (PDF file, 240 KB)
SumStats NIS 2009 DX_PR_Group File (PDF file, 48 KB)
SumStats NIS 2009 Hospital Weights File (PDF file, 96 KB)
SumStats NIS 2009 Severity File (PDF file, 263 KB)

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2008 NIS

SumStats NIS 2008 Core File, unweighted (PDF file, 251 KB)
SumStats NIS 2008 Core Weighted (PDF file, 232 KB)
SumStats NIS 2008 DX_PR_Group File (PDF file, 45 KB)
SumStats NIS 2008 Hospital Weights File (PDF file, 92 KB)
SumStats NIS 2008 Severity File (PDF file, 255 KB)

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2007 NIS

SumStats NIS 2007 Core File, unweighted (PDF file, 258 KB)
SumStats NIS 2007 Core Weighted (PDF file, 217 KB)
SumStats NIS 2007 DX_PR_Group File (PDF file, 45 KB)
SumStats NIS 2007 Hospital Weights File (PDF file, 95 KB)
SumStats NIS 2007 Severity File (PDF file, 323 KB)

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2006 NIS

SumStats NIS 2006 Core File, unweighted (PDF file, 256 KB)
SumStats NIS 2006 Core Weighted (PDF file, 212 KB)
SumStats NIS 2006 DX_PR_Group File (PDF file, 32 KB)
SumStats NIS 2006 Hospital Weights File (PDF file, 69 KB)
SumStats NIS 2006 Severity File (PDF file, 276 KB)

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2005 NIS

SumStats NIS 2005 Core File, unweighted (PDF file, 236 KB)
SumStats NIS 2005 Core Weighted (PDF file, 192 KB)
SumStats NIS 2005 DX_PR_Group File (PDF file, 30 KB)
SumStats NIS 2005 Hospital Weights File (PDF file, 70 KB)
SumStats NIS 2005 Severity File (PDF file, 254 KB)

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2004 NIS

SumStats NIS 2004 Core File, unweighted (PDF file, 247 KB)
SumStats NIS 2004 10% Sample File #1 (PDF file, 239 KB)
SumStats NIS 2004 10% Sample File #2 (PDF file, 239 KB)
SumStats NIS 2004 Hospital Weights File (PDF file, 72 KB)
SumStats NIS 2004 Severity File (PDF file, 256 KB)
SumStats NIS 2004 Severity 10% Sample File #1 (PDF file, 252 KB)
SumStats NIS 2004 Severity 10% Sample File #2 (PDF file, 252 KB)

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2003 NIS

SumStats NIS 2003 Core File, unweighted (PDF file, 246 KB)
SumStats NIS 2003 10% Sample File #1 (PDF file, 224 KB)
SumStats NIS 2003 10% Sample File #2 (PDF file, 224 KB)
SumStats NIS 2003 Hospital Weights File (PDF file, 66 KB)
SumStats NIS 2003 Severity File (PDF file, 247 KB)
SumStats NIS 2003 Severity 10% Sample File #1 (PDF file, 187 KB)
SumStats NIS 2003 Severity 10% Sample File #2 (PDF file, 246 KB)

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2002 NIS

SumStats NIS 2002 Core File, unweighted (PDF file, 256 KB)
SumStats NIS 2002 10% Sample File #1 (PDF file, 251 KB)
SumStats NIS 2002 10% Sample File #2 (PDF file, 251 KB)
SumStats NIS 2002 Hospital Weights File (PDF file, 66 KB)
SumStats NIS 2002 Severity File (PDF file, 247 KB)
SumStats NIS 2002 Severity 10% Sample File #1 (PDF file, 241 KB)
SumStats NIS 2002 Severity 10% Sample File #2 (PDF file, 244 KB)

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2001 NIS

SumStats NIS 2001 Core File (PDF file, 255 KB)
SumStats NIS 2001 10% Sample File #1 (PDF file, 249 KB)
SumStats NIS 2001 10% Sample File #2 (PDF file, 248 KB)
SumStats NIS 2001 Hospital Weights File (PDF file, 65 KB)

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2000 NIS

SumStats NIS 2000 Core File (PDF file, 255 KB)
SumStats NIS 2000 10% Sample File #1 (PDF file, 249 KB)
SumStats NIS 2000 10% Sample File #2 (PDF file, 250 KB)
SumStats NIS 2000 Hospital Weights File (PDF file, 65 KB)

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1999 NIS - Version 2

SumStats NIS 1999 Core File V2 (PDF file, 293 KB)
SumStats NIS 1999 10% Sample File #1 V2 (PDF file, 285 KB)
SumStats NIS 1999 10% Sample File #2 V2 (PDF file, 285 KB)
SumStats NIS 1999 Hospital Weights File V2 (PDF file, 64 KB)

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1998 NIS - Version 2

SumStats NIS 1998 Core File V2 (PDF file, 290 KB)
SumStats NIS 1998 10% Sample File #1 V2 (PDF file, 283 KB)
SumStats NIS 1998 10% Sample File #2 V2 (PDF file, 284 KB)
SumStats NIS 1998 Hospital Weights File V2 (PDF file, 65 KB)

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1997 NIS

SumStats NIS 1997 Core File (PDF file, 265 KB)
SumStats NIS 1997 10% Sample File #1 (PDF file, 238 KB)
SumStats NIS 1997 10% Sample File #2 (PDF file, 239 KB)
SumStats NIS 1997 Hospital Weights File (PDF file, 79 KB)

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1996 NIS

SumStats NIS 1996 Core File (PDF file, 263 KB)
SumStats NIS 1996 10% Sample File #1 (PDF file, 238 KB)
SumStats NIS 1996 10% Sample File #2 (PDF file, 237 KB)
SumStats NIS 1996 Hospital Weights File (PDF file, 79 KB)

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1995 NIS

SumStats NIS 1995 Core File (PDF file, 262 KB)
SumStats NIS 1995 10% Sample File #1 (PDF file, 235 KB)
SumStats NIS 1995 10% Sample File #2 (PDF file, 237 KB)
SumStats NIS 1995 Hospital Weights File (PDF file, 79 KB)

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1994 NIS

SumStats NIS 1994 Core File (PDF file, 256 KB)
SumStats NIS 1994 10% Sample File #1 (PDF file, 234 KB)
SumStats NIS 1994 10% Sample File #2 (PDF file, 233 KB)
SumStats NIS 1994 Hospital Weights File (PDF file, 80 KB)

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1993 NIS

SumStats NIS 1993 Core File (PDF file, 252 KB)
SumStats NIS 1993 10% Sample File #1 (PDF file, 234 KB)
SumStats NIS 1993 10% Sample File #2 (PDF file, 233 KB)
SumStats NIS 1993 Hospital Weights File (PDF file, 80 KB)

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1992 NIS

SumStats NIS 1992 Core File (PDF file, 245 KB)
SumStats NIS 1992 10% Sample File #1 (PDF file, 234 KB)
SumStats NIS 1992 10% Sample File #2 (PDF file, 233 KB)
SumStats NIS 1992 Hospital Weights File (PDF file, 66 KB)

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1991 NIS

SumStats NIS 1991 Core File (PDF file, 245 KB)
SumStats NIS 1991 10% Sample File #1 (PDF file, 234 KB)
SumStats NIS 1991 10% Sample File #2 (PDF file, 236 KB)
SumStats NIS 1991 Hospital Weights File (PDF file, 65 KB)

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1990 NIS

SumStats NIS 1990 Core File (PDF file, 243 KB)
SumStats NIS 1990 10% Sample File #1 (PDF file, 237 KB)
SumStats NIS 1990 10% Sample File #2 (PDF file, 235 KB)
SumStats NIS 1990 Hospital Weights File (PDF file, 68 KB)

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1989 NIS

SumStats NIS 1989 Core File (PDF file, 242 KB)
SumStats NIS 1989 10% Sample File #1 (PDF file, 237 KB)
SumStats NIS 1989 10% Sample File #2 (PDF file, 237 KB)
SumStats NIS 1989 Hospital Weights File (PDF file, 68 KB)

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1988 NIS

SumStats NIS 1988 Core File (PDF file, 236 KB)
SumStats NIS 1988 10% Sample File #1 (PDF file, 229 KB)
SumStats NIS 1988 10% Sample File #2 (PDF file, 227 KB)
SumStats NIS 1988 Hospital Weights File (PDF file, 67 KB)

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Internet Citation: NIS Summary Statistics. Healthcare Cost and Utilization Project (HCUP). January 2024. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/nis/nissummstats.jsp.

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Last modified 01/31/24