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From https://www.hcup-us.ahrq.gov/toolssoftware/ccsr/ccs_refined.jsp

The Clinical Classifications Software Refined (CCSR) for ICD-10-CM diagnoses aggregates over 70,000 ICD-10-CM diagnosis codes into a manageable number of clinically meaningful categories. The CCSR is based on the International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM). The categories are organized across 21 body systems, which generally follow the structure of the ICD-10-CM diagnosis chapters. This initial release of the CCSR replaces the beta version of the CCS for ICD-10-CM diagnoses and applies to all ICD-10-CM diagnosis codes through fiscal year 2019.

User guide with detailed information
https://www.hcup-us.ahrq.gov/toolssoftware/ccsr/DXCCSR-User-Guide.pdf

The CCSR DX categories only include mappings to ICD-10. We will need to map ICD-9 using ICD-9-ICD-10 mappings.