ICD-10-CM > M00-M99 > M70-M79 > M79 > M79.A > M79.A2 M79.A2 Nontraumatic compartment syndrome of lower extremity Non-Billable/Non-Specific Applicable To Nontraumatic compartment syndrome of hip, buttock, thigh, leg, foot, and toes Codes M79.A21Nontraumatic compartment syndrome of right lower extremityM79.A22Nontraumatic compartment syndrome of left lower extremityM79.A29Nontraumatic compartment syndrome of unspecified lower extremity