M79.A9 Nontraumatic compartment syndrome of other sites

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from M79 Other and unspecified soft tissue disorders, not elsewhere classified

Excludes1 (never code together)

• psychogenic rheumatism (F45.8)
• soft tissue pain, psychogenic (F45.41)

Applies from M79.A Nontraumatic compartment syndrome

Excludes1 (never code together)

• compartment syndrome NOS (T79.A-)
• fibromyalgia (M79.7)
• nontraumatic ischemic infarction of muscle (M62.2-)
• traumatic compartment syndrome (T79.A-)

Code first

• , if applicable, associated postprocedural complication

MS-DRG index

Defines the logic of DRG(s) 557-558 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 729.79 Nontraumatic compartment syndrome of other sites

Code annotations containing back-references to M79.A9

Back-references to M79.A

• Type 1 Excludes: M62.2 Nontraumatic ischemic infarction of muscle ("nontraumatic compartment syndrome (M79.A-)")
• Type 1 Excludes: T79.A Traumatic compartment syndrome ("nontraumatic compartment syndrome (M79.A-)")

Diagnosis Index entries for M79.A9

• Compartment syndrome (deep) (posterior) (traumatic) › nontraumatic › specified site NEC
• Syndrome › compartment (deep) (posterior) (traumatic) › nontraumatic › specified site NEC

Nearby codes

• M79.A2 Nontraumatic compartment syndrome of lower extremity
• M79.A21 Nontraumatic compartment syndrome of right lower extremity
• M79.A22 Nontraumatic compartment syndrome of left lower extremity
• M79.A29 Nontraumatic compartment syndrome of unspecified lower extremity
• M79.A3 Nontraumatic compartment syndrome of abdomen
• M79.A9 Nontraumatic compartment syndrome of other sites (this code)
• M79.8 Other specified soft tissue disorders
• M79.81 Nontraumatic hematoma of soft tissue
• M79.89 Other specified soft tissue disorders
• M79.9 Soft tissue disorder, unspecified