Changes in version 0.1-7 (2025-11-27) Minor changes - Removed unnecessary C++11 specification from SystemRequirements in DESCRIPTION. Changes in version 0.1-6 (2022-07-08) Minor changes - Fixed ORCID comment and update redirected URLs. Changes in version 0.1-5 (2019-11-17) Minor changes - Added indication for converting ICD codes with positive combination flags. Changes in version 0.1-4 (2018-10-14) New features - Added fast implementation of the mapping tools developed by AHRQ for translating ICD-9 (resp. ICD-10) codes to ICD-10 (resp. ICD-9) codes based on the General Equivalence Mappings (GEM) from the Centers for Medicare and Medicaid Services (CMS). Changes in version 0.1-3 (2016-12-17) New features - The first version of package that provides functions for mapping ICD-9 codes to the AHRQ comorbidity measures.