T79.A21 — Traumatic compartment syndrome of right lower extremity
Is T79.A21 billable?
No — T79.A21 is a non-billable header code. T79.A21 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 3 billable codes beneath T79.A21.
T79.A21 at a glance
| Code | T79.A21 |
|---|---|
| Description | Traumatic compartment syndrome of right lower extremity |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is T79.A21 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T79.A2, the nearest indexed parent of T79.A21. Use them to find the family, then select the specific code.
- Compartment syndrome › lower extremity (deep) (posterior) (traumatic)
- Syndrome › compartment › lower extremity
Excludes1 — never code together — inherited from T79.A
The conditions below can never be reported together with T79.A21 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 19
Report an additional code alongside T79.A21 to fully describe the condition. T79.A21 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T79.A21, but a patient may have both at the same time. When documentation supports it, T79.A21 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T79
The conditions below are not part of T79.A21, but a patient may have both at the same time. When documentation supports it, T79.A21 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T79.A
The conditions below are not part of T79.A21, but a patient may have both at the same time. When documentation supports it, T79.A21 and the excluded code may both be reported.
- traumatic ischemic infarction of muscle (T79.6)
What codes fall under T79.A21? (3)
How long has T79.A21 existed?
T79.A21 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.