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161. INTRODUCTION TO THE HCUP NATIONAL INPATIENT SAMPLE (NIS), 2014
     hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2014.jsp
     January 01, 2014 - Changes to the NIS may impact some types of analyses. … Analyses of time trends using the HCUP NIS are recommended from 1993 forward because earlier samples … Thus the redesigned NIS cannot support longitudinal analyses of specific hospitals. … In all data years except 2000, this weight is used to create national estimates for all analyses. … In all data years except 2000, this weight is used to create national estimates for all analyses.

162. HEALTHCARE COST AND UTILIZATION PROJECT — HCUP (pdf file)
     hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2020.pdf
     January 01, 2020 - The NRD is designed to be flexible to various types of analyses of readmissions. … The NRD is designed to be flexible to various types of readmission analyses. … The NRD is not designed to support hospital-specific analyses. … The NRD is designed to be flexible to various types of analyses of national readmissions. … The definitions of the readmission rate were specific to the purpose of the analyses.

163. Change log for Surgery Flags Software for Services and Procedures, v2024.1 (xls file)
     hcup-us.ahrq.gov/toolssoftware/surgeryflags_svcproc/SurgeryFlags_Services_Procedures_v2024-1/SF-SvcProc-ChgLg-v20231-v20241.xlsx
     July 01, 2024 - Category II (F) code Not assigned a surgery flag value in v2023.1 565 New code in 2024 Laboratory analyses

164. Cost-to-Charge Ratios for Emergency Department Files
     hcup-us.ahrq.gov/db/ccr/ed-ccr/ed-ccr.jsp
     June 01, 2025 - Cost-to-Charge Ratio (CCR) Files Hospital Market Structure (HMS) Files Supplemental Variables for Revisit Analyses … For some analyses, users may be interested in estimating how hospital charges translate

165. HCUP-US SEDD Overview
     hcup-us.ahrq.gov/seddoverview.jsp
     September 01, 2025 - Cost-to-Charge Ratio (CCR) Files Hospital Market Structure (HMS) Files Supplemental Variables for Revisit Analyses … in participating States, translated into a uniform format to facilitate multi-State comparisons and analyses

166. INTRODUCTION TO THE HCUP NATIONAL INPATIENT SAMPLE (NIS), 2021
     hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2021.jsp
     January 01, 2021 - Changes to the NIS may impact some types of analyses. … Analyses that do not rely on diagnosis and procedure coding should not be affected. … Longitudinal Hospital Analyses Beginning with the 2012 data, the NIS includes a sample of … Thus, the redesigned NIS cannot support longitudinal analyses of specific hospitals. … Analyses that do not rely on diagnosis and procedure coding should not be affected.

167. INTRODUCTION TO THE HCUP NATIONAL INPATIENT SAMPLE (NIS), 2020
     hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2020.jsp
     January 01, 2020 - Changes to the NIS may impact some types of analyses. … Analyses of time trends using the HCUP NIS are recommended from 1993 forward because earlier samples … Analyses that do not rely on diagnosis and procedure coding should not be affected. … Thus, the redesigned NIS cannot support longitudinal analyses of specific hospitals. … Analyses that do not rely on diagnosis and procedure coding should not be affected.

168. Title: (pdf file)
     hcup-us.ahrq.gov/datainnovations/MNAbstractFinal.pdf
     September 29, 2013 - dataset will support better measurement of risk-adjusted clinical outcomes and comparative effectiveness analyses

169. MAINTAIN AND EXPAND (pdf file)
     hcup-us.ahrq.gov/db/nation/nis/reports/Changes_in_NIS_Design_1998.pdf
     January 01, 1998 - Including the same hospitals across years improved the precision of trend analyses, although it may … Weight Calculations All analyses are based on the new stratification scheme described earlier. … Several statistical programming packages allow weighted analyses. … Types of estimands and statistical analyses that can be accommodated. … Types of estimands and statistical analyses that can be accommodated.

170. THE HCUP NATIONWIDE READMISSIONS DATABASE (NRD), 2019
     hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2019.jsp
     January 01, 2019 - The NRD is designed to be flexible to various types of analyses of readmissions. … The NRD is designed to be flexible to various types of readmission analyses. … The NRD is not designed to support hospital-specific analyses. … The NRD is designed to be flexible to various types of analyses of national readmissions. … The definitions of the readmission rate were specific to the purpose of the analyses.

171. INTRODUCTION TO THE HCUP NATIONAL INPATIENT SAMPLE (NIS), 2012
     hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2012.jsp
     January 01, 2012 - Changes to the NIS may impact some types of analyses. … Analyses of time trends are recommended from 1993 forward. … Analyses of time trends are recommended from 1993 forward. … Thus longitudinal analyses of specific hospitals is not supported by the NIS. … In all data years except 2000, this weight is used to create national estimates for all analyses.

172. Healthcare Cost and Utilization Project (HCUP) NEDS Notes
     hcup-us.ahrq.gov/db/vars/hosp_trauma/nedsnote.jsp
     May 01, 2015 - Cost-to-Charge Ratio (CCR) Files Hospital Market Structure (HMS) Files Supplemental Variables for Revisit Analyses … The grouping of trauma hospitals limits analyses performed on trauma hospitals.

173. Healthcare Cost and Utilization Project (HCUP) NRD Notes
     hcup-us.ahrq.gov/db/vars/dxccsr_default_dx1/nrdnote.jsp
     August 01, 2015 - Cost-to-Charge Ratio (CCR) Files Hospital Market Structure (HMS) Files Supplemental Variables for Revisit Analyses … code, AHRQ has created a supplemental default categorization scheme for the CCSR that can be used in analyses

174. MHA/AHRQ Kick-Off Event
     hcup-us.ahrq.gov/datainnovations/clinicaldata/AppendixFMHAAHQRKick-Off.jsp
     July 01, 2016 - Cost-to-Charge Ratio (CCR) Files Hospital Market Structure (HMS) Files Supplemental Variables for Revisit Analyses … participating in the project will be enhanced comparative reporting for quality and patient safety performance analyses

175. Surgery Flag Software For Services and Procedures Change Log V2023.1 (xls file)
     hcup-us.ahrq.gov/toolssoftware/surgeryflags_svcproc/SF-SvcProc-ChgLg-v20221-v20231.xlsx
     March 01, 2024 - Category II (F) code Not assigned a surgery flag value in v2022.1 565 New code in 2023 Laboratory analyses

176. HEALTHCARE COST AND UTILIZATION PROJECT — HCUP (pdf file)
     hcup-us.ahrq.gov/db/nation/kid/Introduction_to_KID_2000.pdf
     January 01, 2000 - The KID was developed to enable analyses of hospital utilization by children across the United States … The KID's large sample size enables analyses of rare conditions, such as congenital anomalies and uncommon … Healthcare Cost and Utilization Project (HCUP) Kids’ Inpatient Database (KID) was developed to enable analyses … This weight is used to create national estimates for all analyses excluding those that involve total … KID PUBLICATIONS HCUP Research Notes and Fact Books report aggregate statistics and detailed analyses

177. HEALTHCARE COST AND UTILIZATION PROJECT — HCUP (pdf file)
     hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2010-2016.pdf
     January 01, 2016 - The NRD is designed to be flexible to various types of analyses of readmissions. … The NRD is designed to be flexible to various types of readmission analyses. … The NRD is not designed to support hospital-specific analyses. … The NRD is designed to be flexible to various types of analyses of national readmissions. … The definitions of the readmission rate were specific to the purpose of the analyses.

178. THE HCUP NATIONWIDE READMISSIONS DATABASE (NRD), 2015
     hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2010-2015.jsp
     January 01, 2015 - The NRD is designed to be flexible to various types of analyses of readmissions. … The NRD is designed to be flexible to various types of readmission analyses. … The NRD is not designed to support hospital-specific analyses. … The NRD is designed to be flexible to various types of analyses of national readmissions. … The definitions of the readmission rate were specific to the purpose of the analyses.

179. HEALTHCARE COST AND UTILIZATION PROJECT — HCUP (pdf file)
     hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2010-2014.pdf
     January 01, 2014 - The NRD is designed to be flexible to various types of analyses of readmissions. … The NRD is designed to be flexible to various types of readmission analyses. …  Data elements essential to readmission analyses:  Verified patient linkage number (HCUP data … The NRD is not designed to support hospital-specific analyses. … The NRD is designed to be flexible to various types of analyses of national readmissions.

180. Most Common Diagnoses and Procedures in U.S. Community Hospitals, 1996
     hcup-us.ahrq.gov/reports/natstats/commdx/commdx.htm
     October 01, 1999 - based on data from the latest year of the HCUP Nationwide Inpatient Sample (NIS), updates similar analyses … CCS, a "clinical grouper," makes ICD-9-CM data more amenable to clinically focused statistical analyses … CCS, a "clinical grouper," makes ICD-9-CM data more amenable to clinically focused statistical analyses … Analyses limited to principal diagnoses and procedures will produce an underestimate of diagnoses that … The estimated total number of discharges represented in these analyses is 34,874,404.