Question: What methodology is being used in the Medicare Severity Diagnosis Related Groups (MS-DRG) International Classification of Diseases, 10th Edition (ICD-10) conversion?
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Answer : The goal of MS-DRG ICD-10 conversion is to replicate the current MS-DRG logic. A record coded in ICD-10-Clinical Modification/Procedure Coding System (CM/PCS) and processed according to the converted ICD-10-based MS-DRGs will be assigned to the same MS-DRG as the same record coded in ICD-9-CM and processed according to the current MS-DRG logic.


We are accomplishing this goal by translating the lists of ICD-9-CM codes that comprise the MS-DRGs (approximately 500 code lists) to comparable lists of ICD-10-CM/PCS codes without changing the underlying MS-DRG logic. This method of replacing lists of ICD-9-CM codes with lists of ICD-10 codes is partially automated using the General Equivalence Mappings.