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hcup-us.ahrq.gov/reports/statbriefs/sb159.jsp
July 01, 2013 - HCUP Supplemental Files 
 NIS-Trend Weights Files 
 NIS Hospital Ownership Files 
 NIS 1993-2002 Discharge-Level … in hospital discharge databases. … discharge data to identify access to and quality of care for "ambulatory care-sensitive conditions." … Unit of analysis 
The unit of analysis is the hospital discharge (i.e., the hospital stay), not a person … When more than one payer is listed for a hospital discharge, the first-listed payer is used.
                                     
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hcup-us.ahrq.gov/reports/ataglance/HCUPMalnutritionHospReport_083018.pdf
August 01, 2018 - Supplemental data sources 
included population denominator data derived from demographic data provided … Bureau of Census data. … The HCUP NIS is the largest all-payer 
inpatient care database in the United States, containing data … billion (data not shown). … Discharge status reflects the disposition of the patient at discharge from the hospital and includes
                                     
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hcup-us.ahrq.gov/news/exhibit_booth/HCUPFactSheet.pdf
March 23, 2022 - The National (Nationwide) Inpatient Sample (NIS) is the largest publicly available all-payer 
inpatient … The inpatient data contained in the NIS represent more than 97 percent of inpatient 
discharges from … The Kids' Inpatient Database (KID) is the only all-payer inpatient care database for children in 
the … The State Inpatient Databases (SID) contain a powerful collection of hospital inpatient discharge 
information … The State Emergency Department Databases (SEDD) contain discharge information on all ED 
visits that
                                     
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hcup-us.ahrq.gov/db/nation/nis/reports/NIS_1999_Design_Report.pdf
January 01, 1999 - Discharge outcomes of 
interest include trends in inpatient treatments with respect to: 
 
• frequency … Two sources for all-payer discharge data were state agencies and 
private data organizations, primarily … If an AHA community 
hospital could not be matched to the discharge data provided by the data source, … discharge data that agreed to provide such data to the 
project. … Calculating Variances Using Data from the HCUP 
Nationwide Inpatient Sample.
                                     
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hcup-us.ahrq.gov/reports/factsandfigures/2007/intro2.jsp
January 01, 2007 - Reports & Publications 
 
 
 Data Visualizations 
 
 
 Data Query Tools 
 
 
 Home 
 
 
 About … Reports Archive 
 
 
 
 
 
 
 
 DATA VISUALIZATIONS 
 
 
 
 
 
 DATA QUERY TOOLS … As a result, HCUP has become the largest all-payer resource of multi-year hospital discharge data from … The Nationwide Inpatient Sample (NIS), the most popular of the six HCUP databases and the data source … for  HCUP Facts and Figures , is the largest all-payer database in the U.S., containing all discharge
                                     
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hcup-us.ahrq.gov/reports/trendtables/HCUPSummaryTrendTables_ChangeLog.xlsx
December 01, 2022 - The table below provides information on the availability of data by State, Year, and Discharge Quarter … The table below provides information on the availability of data by State, Year, and Discharge Quarter … The table below provides information on the availability of data by State, Year, and Discharge Quarter … The table below provides information on the availability of data by State, Year, and Discharge Quarter … The table below provides information on the availability of data by State, Year, and Discharge Quarter
                                     
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hcup-us.ahrq.gov/db/state/siddist/siddist_filecompia.jsp
August 01, 2006 - SID File Composition - Iowa 
 
   
 
 SID Notes 
 Source Files 
 
		The HCUP Iowa inpatient files … Prior to July 1, 2016, IHA was prohibited from releasing these two types of discharge records. … data and some uniform bills for acute inpatient discharges from member hospitals. … Records with a discharge disposition of "still a patient" and "admitted as an inpatient to this hospital … " were excluded from the HCUP Iowa inpatient data.
                                     
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hcup-us.ahrq.gov/reports/statbriefs/sb161.pdf
June 12, 2013 - If more than one discharge occurred during this time frame, only one readmission was counted. … Discharge status 
Discharge status reflects the disposition of the patient at discharge from the hospital … organizations—such as State data 
organizations, hospital associations, private data organizations, … Databases (SID) are hospital inpatient databases from data organizations 
participating in HCUP. … The SID contain the universe of the inpatient discharge abstracts in the 
participating HCUP States,
                                     
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hcup-us.ahrq.gov/db/ccr/ip-ccr/CCR-NRD_UserGuide_2010-2018.pdf
January 01, 2018 - The files are designed to supplement the 
data elements in the HCUP inpatient databases which contain … The CCR for NRD files can be linked to discharge records in the NRD using the HCUP 
hospital identification … The cost of inpatient care for a discharge is estimated by multiplying TOTCHG (from the 
discharge record … dividing the inpatient 
costs by the inpatient charges. … not all of the HCUP Partner 
organizations request that hospitals report detailed charges for every discharge
                                     
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hcup-us.ahrq.gov/reports/statbriefs/sb141.jsp
September 01, 2012 - Data are from the 2009 State Inpatient Databases (SIDs) from the Healthcare Cost and Utilization Project … : discharge to nursing home (skilled nursing facility [SNF], intermediate care facility [ICF]) and discharge … Databases (SID) are hospital inpatient databases from data organizations participating in HCUP. … The SID contain the universe of the inpatient discharge abstracts in the participating HCUP States, translated … of Growth in Inpatient Hospital Costs, 1997-2009 .
                                     
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hcup-us.ahrq.gov/db/state/sedddist/sedddist_filecompri.jsp
August 01, 2012 - HCUP Supplemental Files 
 NIS-Trend Weights Files 
 NIS Hospital Ownership Files 
 NIS 1993-2002 Discharge-Level … The overall 
				number of discharge records is similar to previous years as well as the emergency department … Each record contains an inpatient segment, an observation 
				stay (OS) segment, a summary segment, … Exclusion of Records During HCUP Data Processing 
 
				Beginning with 2016 data, records with a discharge … Beginning in 2010, 
				records with a designation of "admitted as an inpatient" are retained in the
                                     
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hcup-us.ahrq.gov/db/nation/nis/reports/NIS_1997_Design_Report.pdf
January 01, 1997 - Discharge
outcomes of interest include trends in inpatient treatments with respect to:
� frequency, … If an AHA
community hospital could not be matched to the discharge data provided by the data source, … discharge data that agreed to provide
such data to the project. … specific analyses (see the Technical Supplement: Comparative
Analysis of HCUP and NHDS Inpatient Discharge … Calculating Variances Using Data from the
HCUP Nationwide Inpatient Sample.
                                     
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hcup-us.ahrq.gov/db/vars/discwt/nedsnote.jsp
May 01, 2015 - Reports & Publications 
 
 
 Data Visualizations 
 
 
 Data Query Tools 
 
 
 Home 
 
 
 About … Reports Archive 
 
 
 
 
 
 
 
 DATA VISUALIZATIONS 
 
 
 
 
 
 DATA QUERY TOOLS … weight on the HCUP nationwide databases - Nationwide Inpatient Sample (NIS), Nationwide Emergency Department … NEDS), Nationwide Readmissions Database (NRD), Nationwide Ambulatory Surgery Sample (NASS), and Kids' Inpatient … Prior to 1998, the discharge weight was named DISCWT_U.
                                     
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hcup-us.ahrq.gov/db/vars/discwt/nrdnote.jsp
August 01, 2015 - Reports & Publications 
 
 
 Data Visualizations 
 
 
 Data Query Tools 
 
 
 Home 
 
 
 About … Reports Archive 
 
 
 
 
 
 
 
 DATA VISUALIZATIONS 
 
 
 
 
 
 DATA QUERY TOOLS … weight on the HCUP nationwide databases - Nationwide Inpatient Sample (NIS), Nationwide Emergency Department … NEDS), Nationwide Readmissions Database (NRD), Nationwide Ambulatory Surgery Sample (NASS), and Kids' Inpatient … Prior to 1998, the discharge weight was named DISCWT_U.
                                     
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hcup-us.ahrq.gov/db/vars/discwt/nisnote.jsp
September 01, 2008 - Reports & Publications 
 
 
 Data Visualizations 
 
 
 Data Query Tools 
 
 
 Home 
 
 
 About … Reports Archive 
 
 
 
 
 
 
 
 DATA VISUALIZATIONS 
 
 
 
 
 
 DATA QUERY TOOLS … weight on the HCUP nationwide databases - Nationwide Inpatient Sample (NIS), Nationwide Emergency Department … NEDS), Nationwide Readmissions Database (NRD), Nationwide Ambulatory Surgery Sample (NASS), and Kids' Inpatient … Prior to 1998, the discharge weight was named DISCWT_U.
                                     
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hcup-us.ahrq.gov/db/vars/discwt/kidnote.jsp
September 01, 2008 - Reports & Publications 
 
 
 Data Visualizations 
 
 
 Data Query Tools 
 
 
 Home 
 
 
 About … Reports Archive 
 
 
 
 
 
 
 
 DATA VISUALIZATIONS 
 
 
 
 
 
 DATA QUERY TOOLS … weight on the HCUP nationwide databases - Nationwide Inpatient Sample (NIS), Nationwide Emergency Department … NEDS), Nationwide Readmissions Database (NRD), Nationwide Ambulatory Surgery Sample (NASS), and Kids' Inpatient … Prior to 1998, the discharge weight was named DISCWT_U.
                                     
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hcup-us.ahrq.gov/db/nation/nis/reports/NIS_2000_Design_Report.pdf
January 01, 2000 - Discharge outcomes of 
interest include trends in inpatient treatments with respect to: 
• frequency … Two sources for all-payer discharge data were state agencies and 
private data organizations, primarily … sources that 
maintain statewide, all-payer discharge data files to include their data in the HCUP databases … If an AHA community 
hospital could not be matched to the discharge data provided by the data source, … discharge data that agreed to provide such data to the 
project.
                                     
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hcup-us.ahrq.gov/db/quality.pdf
January 31, 2025 - Admission Date, Discharge Date, and Length of Stay5 
 
ELOS01 
 
ADMISSION DATE (FOR INPATIENT 
DATA … ELOS02 
 
DISCHARGE DATE (FOR INPATIENT 
DATA) OR END OF SERVICE DATE 
(FOR OUTPATIENT DATA) IS MISSING … EDXPR03 
 
DISCHARGE RECORD IS 
UNGROUPABLE (Inpatient data only)  
Inpatient discharge is ungroupable … Admission Date, Discharge Date, and Length of Stay 
 
ELOS01 
 
ADMISSION DATE (FOR INPATIENT 
DATA) … ELOS02 
 
DISCHARGE DATE (FOR INPATIENT 
DATA) OR END OF SERVICE DATE 
(FOR OUTPATIENT DATA) IS MISSING
                                     
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hcup-us.ahrq.gov/reports/methods/2016-01.pdf
January 01, 2016 - The PQIs were developed for use with hospital inpatient discharge data. … Area-Based QIs using Weighted Discharge Data in the Numerator and Nielsen 
Population Data in the Denominator … Provider-based QIs using Weighted Discharge Data in the Numerator and 
Denominator  
 
a. … Standard error estimates for inpatient rates per 1,000 discharges using discharge 
counts in both the … Discharge Data Set (UHDDS) format.
                                     
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hcup-us.ahrq.gov/db/nation/nis/NIS_1999_HOSPITAL.pdf
January 01, 1999 - http://172.16.18.243/db/nation/nis/nishospnotes.jsp
Description of Data Elements 
Nationwide Inpatient … years of HCUP data from 1988 to the current data year. … For detailed 
information about the development and use of discharge and hospital weights, see the year-specific … The data element AHAID retains the original 7-digit value. … In the 1988-1997 HCUP databases, YEAR is two-digits (e.g., if 
the discharge year is 1990, then YEAR