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Table 6 CMS Categorization of the Case Mix Groups (CMG) (M-Motor, C-Cognitive, A-Age)

From: Inpatient rehabilitation service utilization and outcomes under US ACA Medicaid expansion

Stroke Hip Fracture Joint Replacement
CMG101 Stroke M > 51.05 CMG701 Fracture of lower extremity M > 42.15 CMG801 Replacement of lower extremity joint M > 49.55
102 Stroke M > 44.45 and M < 51.05 and C > 18.5 702 Fracture of lower extremity M > 34.15 and M < 42.15 802 Replacement of lower extremity joint M > 37.05 and M < 49.55
103 Stroke M > 44.45 and M < 51.05 and C < 18.5 703 Fracture of lower extremity M > 28.15 and M < 34.15 803 Replacement of lower extremity joint M > 28.65 and M < 37.05 and A > 83.5
104 Stroke M > 38.85 and M < 44.45 704 Fracture of lower extremity M < 28.15 804 Replacement of lower extremity joint M > 28.65 and M < 37.05 and A < 83.5
105 Stroke M > 34.25 and M < 38.85 5001 Short-stay cases, length of stay is 3 days or fewer 805 Replacement of lower extremity joint M > 22.05 and M < 28.65
106 Stroke M > 30.05 and M < 34.25 5101 Expired, orthopedic, length of stay is 13 days or fewer 806 Replacement of lower extremity joint M < 22.05
107 Stroke M > 26.15 and M < 30.05    5001 Short-stay cases, length of stay is 3 days or fewer
108 Stroke M < 26.15 and A > 84.5    5101 Expired, orthopedic, length of stay is 13 days or fewer
109 Stroke M > 22.35 and M < 26.15 and A < 84.5     
110 Stroke M < 22.35 and A < 84.5     
5001 Short-stay cases, length of stay is 3 days or fewer