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Tools for ICD-10-CM/PCS
Clinical Classifications Software Refined (CCSR)
Elixhauser Comorbidity Software Refined for ICD-10-CM
Chronic Condition Indicator Refined for ICD-10-CM
Procedure Classes Refined for ICD-10-PCS
Tools for CPT and HCPCS Level II
CCS for Services and Procedures
Surgery Flags for Services and Procedures
Tools for ICD-9-CM
Clinical Classifications Software (CCS) for ICD-9-CM
Chronic Condition Indicator (CCI) for ICD-9-CM
Elixhauser Comorbidity Software for ICD-9-CM
Utilization Flags for Revenue Center Codes and ICD-9-CM
Procedure Classes for ICD-9-CM
Surgery Flags for ICD-9-CM
HCUP Supplemental Files
NIS-Trend Weights Files
NIS Hospital Ownership Files
NIS 1993-2002 Discharge-Level Supplemental Files
KID-Trend File
Cost-to-Charge Ratio (CCR) Files
Hospital Market Structure (HMS) Files
Supplemental Variables for Revisit Analyses
American Hospital Association (AHA) Linkage Files
AHRQ Quality Indicators (QIs)
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NRD Related Reports
The links below provide additional information on the impact of the ICD-10-CM/PCS transition on readmission rates, readmission methodology, and variance calculations applicable to the Nationwide Readmissions Database (NRD).
Impact of the ICD-10-CM/PCS Transition on Readmission Rates, 2015-2017
(PDF file, 359 KB)
Supplemental Tables
(Excel file, 285 KB)
HCUP Method Series Reports
Calculating Nationwide Readmissions Database (NRD) Variances
(PDF file, 325 KB)
Methodological Issues When Studying Readmissions and Revisits Using Hospital Administrative Data
(PDF file, 301 KB)
Overview of Key Readmission Measures and Methods
(PDF file, 348 KB)
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