M79.A12 – Nontraumatic compartment syndrome of left upper extremity

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

Billable code

ICD-10-CM code M79.A12

Code: M79.A12 (claims format: M79A12)
Description: Nontraumatic compartment syndrome of left upper extremity
Billable: Yes – valid for HIPAA-covered transactions
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 › M79.A1

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

M79.A1 – Nontraumatic compartment syndrome of upper extremity

Applicable to:

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

Related codes in M79.A1

Frequently asked questions

What is ICD-10 code M79.A12?

M79.A12 is the ICD-10-CM code for nontraumatic compartment syndrome of left upper extremity, in the block M70-M79 (Other soft tissue disorders).

Is M79.A12 a billable code?

Yes. M79.A12 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M79.A12 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.