T79.A29D — Traumatic compartment syndrome of unspecified lower extremity, subsequent encounter
Is T79.A29D billable?
Yes, but T79.A29D is an unspecified code. T79.A29D is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T79.A29D is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting T79.A29D — the more specific alternatives are listed below.
T79.A29D at a glance
| Code | T79.A29D |
|---|---|
| Description | Traumatic compartment syndrome of unspecified lower extremity, subsequent encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "D" | subsequent encounter |
What does the 7th character "D" mean in T79.A29D?
In T79.A29D, the 7th character D means subsequent encounter. The 7th character is required for T79.A29D to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T79.A29D group to?
T79.A29D sits in MDC 23 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.
- 949Aftercare with CC/MCCmedical
- 950Aftercare without CC/MCCmedical
How is T79.A29D listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T79.A2, the nearest indexed parent of T79.A29D. 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.A29D 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.A29D to fully describe the condition. T79.A29D 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.A29D, but a patient may have both at the same time. When documentation supports it, T79.A29D and the excluded code may both be reported.
Excludes2 — not included here — inherited from T79
The conditions below are not part of T79.A29D, but a patient may have both at the same time. When documentation supports it, T79.A29D and the excluded code may both be reported.
Excludes2 — not included here — inherited from T79.A
The conditions below are not part of T79.A29D, but a patient may have both at the same time. When documentation supports it, T79.A29D and the excluded code may both be reported.
- traumatic ischemic infarction of muscle (T79.6)
How long has T79.A29D existed?
T79.A29D 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.