DXCCSR_VERSION indicates the version number (yyyy.n) of the Clinical Classifications Software Refined (CCSR) for ICD-10-CM diagnoses where yyyy indicates the fiscal year for ICD-10-CM diagnosis codes and n indicates the release number within the fiscal year. The CCSR is valid for ICD-10-CM diagnosis codes from October 1, 2015 (the start of ICD-10-CM) through September of the designated fiscal year. Information on the CCSR for ICD-10-CM diagnoses, including a log of changes between versions, is available on the HCUP User Support web site under Tools and Software.