M79.A9 — Nontraumatic compartment syndrome of other sites
Is M79.A9 billable?
Yes — M79.A9 is billable for FY2027. M79.A9 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. M79.A9 may be submitted for encounters from October 1, 2026 through September 30, 2027.
M79.A9 at a glance
| Code | M79.A9 |
|---|---|
| Description | Nontraumatic compartment syndrome of other sites |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does M79.A9 group to?
M79.A9 sits in MDC 08 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 557Tendonitis, Myositis and Bursitis with MCCmedical
- 558Tendonitis, Myositis and Bursitis without MCCmedical
As a secondary diagnosis, M79.A9 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is M79.A9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to M79.A9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Compartment syndrome › nontraumatic › specified site NEC (deep) (posterior) (traumatic)
- Syndrome › compartment › nontraumatic › specified site NEC
Excludes1 — never code together — inherited from M79
The conditions below can never be reported together with M79.A9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes1 — never code together — inherited from M79.A
The conditions below can never be reported together with M79.A9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Code first — inherited from M79.A
The underlying condition below must be sequenced before M79.A9. M79.A9 describes a manifestation and cannot be the principal or first-listed diagnosis.
- , if applicable, associated postprocedural complication
Excludes2 — not included here — inherited from Chapter 13
The conditions below are not part of M79.A9, but a patient may have both at the same time. When documentation supports it, M79.A9 and the excluded code may both be reported.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
How long has M79.A9 existed?
M79.A9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.