ICD-10-CM 2027 diagnosis code

M79.A2Nontraumatic compartment syndrome of lower extremity

Not billable — use a more specific code

M79.A2 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M79.A2

M79.A2 is the ICD-10-CM diagnosis code for nontraumatic compartment syndrome of lower extremity. It belongs to category M79 (other and unspecified soft tissue disorders, not elsewhere classified), block M70-M79 (other soft tissue disorders) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within M79.A (nontraumatic compartment syndrome), M79.A2 is specifically for nontraumatic compartment syndrome of lower extremity. Related codes cover of upper extremity (M79.A1), of abdomen (M79.A3) and of other sites (M79.A9).

To report this condition, pick the subcode that matches the documentation: M79.A21 (extremity), M79.A22 (extremity) and M79.A29 (extremity).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under M79.A2

Coding notes

Applicable toConditions and synonyms classified to this code

Nontraumatic compartment syndrome of hip, buttock, thigh, leg, foot, and toes

Notes that apply from higher levels

Instructions written at a parent level also apply to M79.A2.

› From M79.A Nontraumatic compartment syndrome

Excludes1

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

› From M79 Other and unspecified soft tissue disorders, not elsewhere classified

Excludes1

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

Broader instructions also apply from Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to M79.A2.

Code history

2016
2017
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2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about M79.A2

Is M79.A2 billable?: No. M79.A2 is a header code. Report one of its more specific subcodes instead.