ICD-10-CM > M00-M99 > M70-M79 > M79 > M79.A M79.A Nontraumatic compartment syndrome Non-Billable/Non-Specific Code First , if applicable, associated postprocedural complication Type 1 Excludes compartment syndrome NOS (T79.A-)fibromyalgia (M79.7)nontraumatic ischemic infarction of muscle (M62.2-)traumatic compartment syndrome (T79.A-) Codes M79.A1Nontraumatic compartment syndrome of upper extremityM79.A11Nontraumatic compartment syndrome of right upper extremityM79.A12Nontraumatic compartment syndrome of left upper extremityM79.A19Nontraumatic compartment syndrome of unspecified upper extremityM79.A2Nontraumatic compartment syndrome of lower extremityM79.A21Nontraumatic compartment syndrome of right lower extremityM79.A22Nontraumatic compartment syndrome of left lower extremityM79.A29Nontraumatic compartment syndrome of unspecified lower extremityM79.A3Nontraumatic compartment syndrome of abdomenM79.A9Nontraumatic compartment syndrome of other sites