Is M79.A22 a billable ICD-10-CM code?

Yes. M79.A22 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does M79.A22 sit in the tabular list?

Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Other soft tissue disorders (M70-M79).

What cannot be coded together with M79.A22?

M79.A22 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M79.A22 (M79.A, M79) and apply to it just the same.

M79.A22

M79.A22 — Nontraumatic compartment syndrome of left lower extremity

Billable / specific codeICD-10-CMleft

M79.A22 is a billable, specific ICD-10-CM code for nontraumatic compartment syndrome of left lower extremity. It is valid for submission on a claim.

Excludes1 inherited from the categories above M79.A22

These are not written on M79.A22, but they bind it: a note on a category applies to every code beneath it. Billing M79.A22 with anything listed here is a denial.

Written on M79.A — Nontraumatic compartment syndrome

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

Written on M79 — Other and unspecified soft tissue disorders, not elsewhere classified

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

Risk adjustment

M79.A22 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

M79.A22 is named in 10 Medicare coverage policies — 3 listing it as supporting medical necessity, and 7 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A58865Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
A58883Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
A58893Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered
A59374Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Woundnot covered

Code history

M79.A22 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share M79.A2. If M79.A22 is not quite right, the correct code is usually one of these.

Questions about M79.A22

Is M79.A22 a billable ICD-10-CM code?: Yes. M79.A22 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does M79.A22 sit in the tabular list?: Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Other soft tissue disorders (M70-M79).
What cannot be coded together with M79.A22?: M79.A22 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M79.A22 (M79.A, M79) and apply to it just the same.