ICD-10-CM > M00-M99 > M70-M79 > M79 > M79.A > M79.A1 M79.A1 Nontraumatic compartment syndrome of upper extremity Non-Billable/Non-Specific Applicable To Nontraumatic compartment syndrome of shoulder, arm, forearm, wrist, hand, and fingers Codes M79.A11Nontraumatic compartment syndrome of right upper extremityM79.A12Nontraumatic compartment syndrome of left upper extremityM79.A19Nontraumatic compartment syndrome of unspecified upper extremity