The Major Diagnostic Categories (MDC) are formed by dividing all possible principal diagnoses (from ICD - 9 - CM) into 25 mutually exclusive diagnosis areas. MDC codes, like diagnosis - related group (DRG) codes, are primarily a claims and administrative data element unique to the United States medical care reimbursement system. DRG codes also are mapped, or grouped, into MDC codes.
how many major diagnostic categories are there in the ms-drg system
25