- 
                                        
hcup-us.ahrq.gov/db/nation/nis/nis_2003_stspecific_restr.jsp
January 01, 2003 - Reports & Publications 
 
 
 Data Visualizations 
 
 
 Data Query Tools 
 
 
 Home 
 
 
 About … HCUP Supplemental Files 
 NIS-Trend Weights Files 
 NIS Hospital Ownership Files 
 NIS 1993-2002 Discharge-Level … Care Cost Containment Council requested that no more than 40% of Illinois discharges appear in any discharge … Missing Discharges 
			 
 
 
 
 
 
   
 
 The Nebraska Hospital Association prohibits the release of discharge … Virginia Health Information  
 
 Confidentiality of Hospitals  
 
 
 
 
 
 
   
 
 
				The Nationwide Inpatient
                                     
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hcup-us.ahrq.gov/db/nation/nis/APS-DRGsWeightsV25Public.pdf
June 01, 2009 - Weights User’s Guide 7
CHAPTER 2: Methods
AP
DATA
Data from the 2002 National Inpatient Sample (NIS … The 2002 NIS contains information on all inpatient stays from 995 hospitals, a total of 
7,853,982 records … Few records (n=32) were assigned to APS-DRG 4690, 
Principal Diagnosis Invalid as Discharge Diagnosis … Even when performed 
as an inpatient, few patients have Major CCs associated with them. … To calculate an expected charge (expected LOS, or expected mortality) for a given 
discharge record,
                                     
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hcup-us.ahrq.gov/reports/natstats/commdx/table1a.htm
February 11, 2011 - The top 100 
principal procedures and their associated principal diagnoses:  HCUP 
Nationwide Inpatient … You may need to scroll your browser to the right to see all the data.) 
  P1. … You may need to scroll your browser to the right to see all the data.) 
  P2. … You may need to scroll your browser to the right to see all the data.) 
  P3. … You may need to scroll your browser to the right to see all the data.) 
  P4.
                                     
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hcup-us.ahrq.gov/db/vars/dxn/nedsnote.jsp
May 01, 2015 - In the HCUP inpatient databases, the first listed diagnosis is the principal diagnosis defined as the … Diagnoses are compared to a list of ICD-9-CM codes valid for the discharge date. … Connecticut (SEDD) 
 Connecticut supplied 30 diagnoses to HCUP although any given discharge reports fewer … Kansas (SEDD) 
 Kansas supplied 30 diagnoses to HCUP although any given discharge reports only 25 diagnoses … Nebraska (SID and SEDD) 
 The Nebraska Hospital Association prohibits the release of discharge records
                                     
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hcup-us.ahrq.gov/reports/natstats/commdx/table2a.htm
February 11, 2011 - The top 100 principal 
diagnoses and their associated principal procedures:  HCUP Nationwide 
Inpatient … You may need to scroll your browser to the right to see all the data.)
  D1. … You may need to scroll your browser to the right to see all the data.)
  D3. … You may need to scroll your browser to the right to see all the data.)
  D4. … You may need to scroll your browser to the right to see all the data.)
  D5.
                                     
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hcup-us.ahrq.gov/db/nation/nis/NIS_Sources_and_Restrictions_2002.pdf
January 01, 2002 - HCUP NIS (6/09/04) 1 Sources of NIS Data and  
  State-Specific Restrictions  
Sources of NIS Data … Care Cost Containment Council requested that no more 
than 40% of Illinois discharges appear in any discharge … quarter of NIS 
data … Missing Discharges 
 
The Nebraska Hospital Association prohibits the release of discharge 
records … VA  Virginia Health Information  
 
 Confidentiality of Hospitals  
 
The Nationwide Inpatient Sample
                                     
                                                                    - 
                                        
hcup-us.ahrq.gov/news/exhibit_booth/nass_brochure.jsp
March 01, 2020 - Reports & Publications 
 
 
 Data Visualizations 
 
 
 Data Query Tools 
 
 
 Home 
 
 
 About … HCUP Supplemental Files 
 NIS-Trend Weights Files 
 NIS Hospital Ownership Files 
 NIS 1993-2002 Discharge-Level … Reports Archive 
 
 
 
 
 
 
 
 DATA VISUALIZATIONS 
 
 
 
 
 
 DATA QUERY TOOLS … Learn more about NASS data. … (inpatient, ambulatory surgery, and emergency department) in the United States, beginning in 1988.
                                     
                                                                    - 
                                        
hcup-us.ahrq.gov/db/nation/kid/KID_2003_CORE_Volume2_M-Z.pdf
January 01, 2003 - Description of Data Elements 
 
Kids' Inpatient Database (KID) 
 
Core File 
 
2003 
 
Volume … the discharge 
record. … PRn - Procedure 
General Notes 
In the HCUP inpatient databases, the first listed procedure … Beginning with 1995, total charges of 
$1.00 in the Kansas inpatient data were set to missing (.). … Beginning with 1995, total charges of 
$1.00 in the Kansas inpatient data were set to missing (.).
                                     
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hcup-us.ahrq.gov/db/nation/nis/APS-DRGs%20V23%20Weights%20Manual.pdf
August 01, 2006 - Weights User’s Guide 4
Chapter 2: Methods Data
A
DATA
Data from the 2002 National Inpatient Sample … The 2002 NIS contains information on all inpatient stays from 995 hospitals, a total of 
7,853,982 records … Few records (n=32) were assigned to APS-DRG 4690, 
Principal Diagnosis Invalid as Discharge Diagnosis … Even when performed 
as an inpatient, few patients have Major CCs associated with them. … To calculate an expected charge (expected LOS, or expected mortality) for a given 
discharge record,
                                     
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hcup-us.ahrq.gov/reports/factsandfigures/2009/exhibit5_1.jsp
January 01, 2009 - Database Information 
 
 
 
 Research Tools 
 
 
 Request Data … Reports & Publications 
 
 
 Data Visualizations 
 
 
 Data Query Tools 
 
 
 Home 
 
 
 About … HCUP Supplemental Files 
 NIS-Trend Weights Files 
 NIS Hospital Ownership Files 
 NIS 1993-2002 Discharge-Level … Reports Archive 
 
 
 
 
 
 
 
 DATA VISUALIZATIONS 
 
 
 
 
 
 DATA QUERY TOOLS … Center for Delivery, Organization, and Markets, Healthcare Cost and Utilization Project, Nationwide Inpatient
                                     
                                                                    - 
                                        
hcup-us.ahrq.gov/toolssoftware/chronic_icd10/CCIR-User-Guide-v2025-1.pdf
November 01, 2024 - available in  
Appendix A. 
  
 
1 Please note that with the publication of the Final Rule for the inpatient … Starting on October 1, 2015, 
diagnoses for hospital inpatient stays and outpatient encounters in the … The reason for the cardiac surgery should be reported on the discharge 
record. … when conducting an analysis that counts the number of chronic 
conditions on a discharge record. … The reason for 
the cardiac surgery should be reported on the discharge record.
                                     
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hcup-us.ahrq.gov/datainnovations/ICD-10_PCS_Trends_11022017.pdf
November 02, 2017 - claims data 
• ICD-10-PCS: procedure coding on inpatient billing and claims data. … discharge-level data on inpatient stays from most, 
if not all, hospitals in the State. … analysis consisted of calculating trends based on the number of stays involving various 
procedures in discharge … Table 11 presents counts of inpatient stays by discharge quarter for the individual ICD-9-CM 
and ICD … Table 12 presents counts of inpatient stay by discharge quarter for the individual ICD-9-CM and 
ICD
                                     
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hcup-us.ahrq.gov/reports/methods/2015-04.pdf
January 01, 2015 - with MedPAR data. … 2012 with Fiscal Year 2012 
Medicare Provider Analysis and Review (MedPAR) inpatient data from the … sources for such a significant subset 
of the inpatient population. … with MedPAR data. … Sources of 2007 HCUP Inpatient Data for the NHQR and the NHDR 
	Table 3.
                                     
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hcup-us.ahrq.gov/reports/ataglance/HCUPAnalysisCA2018Wildfires.pdf
November 07, 2019 - HCUP Databases 
ED utilization data was extracted from the Healthcare Cost and Utilization Project ( … HCUP databases bring together the data collection 
efforts of State data organizations, hospital associations … resource of encounter-level health care 
data. … The HCUP State Inpatient Databases (SID) contain the universe of the inpatient discharge abstracts from … race/ethnicity) 
• Principal (first-listed) and secondary diagnoses and procedures 
• Admission and discharge
                                     
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hcup-us.ahrq.gov/pdf/HCUP-State-Data-Application-Kit.pdf
May 31, 2025 - participating in the Healthcare Cost and Utilization Project (HCUP) have agreed to 
release their State Inpatient … sequential visits for a patient within a State and 
across facilities and settings (e.g., inpatient, … Actual dates (e.g., admission, discharge, or birth) are not needed. … var=key), which must be used to merge revisit
data with the discharge files. … state(s)
or data organization(s) that submitted data to HCUP, e.g., “state name(s), State Inpatient
                                     
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hcup-us.ahrq.gov/reports/statbriefs/sb266-Injuries-Causes-ED-Visits-2017.pdf
January 01, 2017 - Topics include hospital inpatient, 
ambulatory surgery, and emergency department use and costs, quality … Secondary diagnoses are 
conditions that coexist at the time of the ED visit or inpatient admission, … Data). … bItTFDXTd66iEpPXEANbDP7yfCHH-cfeRDFJ2CX5X-4&e=
12 
 
ED visits resulting in admission or transfer 
Disposition of the patient at discharge … analysis
	Expected payer
	ED visits resulting in admission or transfer
	Disposition of the patient at discharge
                                     
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hcup-us.ahrq.gov/reports/methods/2006_2.pdf
January 01, 2006 - Table 1: Availability of PNUM_R by State and Data Type, 2003 Data Year 
Inpatient 
(SID) 
Ambulatory … In SID databases, each observation should represent a 
distinct inpatient stay. … Approximate Number of 
Possible PNUM_R 
Values 
Approximate Number of 
Inpatient Observations 
( … For example, with inpatient data one would expect to 
see approximately 5,500 observations with recurring … Such causes include submission of test data, clerical errors resulting in multiple 
discharge abstracts
                                     
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hcup-us.ahrq.gov/reports/natstats/94drgb.htm
September 01, 1997 - HCUP-3 Nationwide Inpatient Sample for 1994: Diagnosis-Related Groups 
 
 
 
 
 Statistics from the … Nationwide Inpatient Sample 
for 1994 Hospital Inpatient Stays (continued) 
 
 
Diagnosis-related … diagnosis
469 Principal diagnosis          370         0.00        3.52        8,177 
    invalid as discharge … Questions & Comments to:  hcup@ahrq.gov 
 
 
 Return to Statistics and 
Research Notes Based on HCUP Data
                                     
                                                                    - 
                                        
hcup-us.ahrq.gov/reports/methods/2018-02-Supp1-2.pdf
January 01, 2018 - includes the two supplements with information on the expected payer coding in the 1998–2016 HCUP State Inpatient … In Table 1, effective dates for coding are 
specified by the HCUP database:  State Inpatient Databases … In Table 2, effective dates for coding are specified by the HCUP database:  State Inpatient Databases … Sources of 2007 HCUP Inpatient Data for the NHQR and the NHDR 
	Table 3. … Sources of 2007 HCUP Inpatient Data for the NHQR and the NHDR 
	Table 3.
                                     
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hcup-us.ahrq.gov/reports/race/50StateScan04_26forweb.pdf
December 01, 2010 - , Doctor's First Reports of 
Occupational Injury or Illness 
(DFR), Hospital Discharge Data, 
Worker's … Data, CHIME 
data (hospital discharge and ED 
data from Hospital Association), 
US Census Bureau (Census … , Census, MI Inpatient 
Database, MI Care Improvement 
Registry, HEDIS, MI Maternal 
Morbidity Database … Mortality 
Review, PRAMS, Program 
Databases, Program-Specific 
Surveys, Vital Statistics, Census, 
MI Inpatient … Data, 
National Hospital Discharge 
Survey (CDC),YBRFSS, Youth 
Tobacco Survey
Geographic 
(State)