M79.A1 – Nontraumatic compartment syndrome of upper extremity

ICD-10-CM 2027 diagnosis code · Other soft tissue disorders

Non-billable header

ICD-10-CM code M79.A1

Code: M79.A1 (claims format: M79A1)
Description: Nontraumatic compartment syndrome of upper extremity
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M70-M79 Other soft tissue disorders
Parent codes: M79 › M79.A

Billable codes under M79.A1

M79.A1 is a header code and cannot be used on claims. Choose the most specific code:

Notes for M79.A1

Applicable to:

Nontraumatic compartment syndrome of shoulder, arm, forearm, wrist, hand, and fingers

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

M79 – Other and unspecified soft tissue disorders, not elsewhere classified

Excludes1 (not coded here):

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

M79.A – Nontraumatic compartment syndrome

Excludes1 (not coded here):

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

Index terms for M79.A1

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in M79.A

Frequently asked questions

What is ICD-10 code M79.A1?

M79.A1 is the ICD-10-CM code for nontraumatic compartment syndrome of upper extremity, in the block M70-M79 (Other soft tissue disorders).

Is M79.A1 a billable code?

No. M79.A1 is a header code with more specific child codes; report one of the billable codes listed above.

What category does M79.A1 belong to?

It belongs to category M79 – Other and unspecified soft tissue disorders, not elsewhere classified.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.