Coma scale MCCs

Does anyone know why the usual MCCs of R402213 coma scale no verbal response and R402343 coma scale flexion withdrawal are not MCCs in a diabetic DRG such as 639/638? May also be same reason secondary diagnosis G92 Toxic encephalopathy is not an MCC for diabetic DRG 639/638? I just don't know the reason. I am going to submit the question to 3M Nosology but thought I would ask here as well. Thanks
Mimi Jones, BSN, RN, CCDS
Vibra Healthcare

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