T79.A0XA — Compartment syndrome, unspecified, initial encounter
Is T79.A0XA billable?
Yes, but T79.A0XA is an unspecified code. T79.A0XA is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T79.A0XA 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.A0XA — the more specific alternatives are listed below.
More specific alternatives
- T79.A11ATraumatic compartment syndrome of right upper extremity, initial encounter
- T79.A21ATraumatic compartment syndrome of right lower extremity, initial encounter
- T79.A3XATraumatic compartment syndrome of abdomen, initial encounter
- T79.A9XATraumatic compartment syndrome of other sites, initial encounter
T79.A0XA at a glance
| Code | T79.A0XA |
|---|---|
| Description | Compartment syndrome, unspecified, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in T79.A0XA?
In T79.A0XA, the 7th character A means initial encounter. The 7th character is required for T79.A0XA to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T79.A0XA group to?
T79.A0XA sits in MDC 21 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.
- 922Other Injury, Poisoning and Toxic Effect Diagnoses with MCCmedical
- 923Other Injury, Poisoning and Toxic Effect Diagnoses without MCCmedical
As a secondary diagnosis, T79.A0XA is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is T79.A0XA listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T79.A0, the nearest indexed parent of T79.A0XA. Use them to find the family, then select the specific code.
- Compartment syndrome (deep) (posterior) (traumatic)
- Syndrome › compartment
Inclusion terms
Alternative wording in documentation that is classified to T79.A0XA.
- Compartment syndrome NOS
Excludes1 — never code together — inherited from T79.A
The conditions below can never be reported together with T79.A0XA 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.A0XA to fully describe the condition. T79.A0XA 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.A0XA, but a patient may have both at the same time. When documentation supports it, T79.A0XA and the excluded code may both be reported.
Excludes2 — not included here — inherited from T79
The conditions below are not part of T79.A0XA, but a patient may have both at the same time. When documentation supports it, T79.A0XA and the excluded code may both be reported.
Excludes2 — not included here — inherited from T79.A
The conditions below are not part of T79.A0XA, but a patient may have both at the same time. When documentation supports it, T79.A0XA and the excluded code may both be reported.
- traumatic ischemic infarction of muscle (T79.6)
How long has T79.A0XA existed?
T79.A0XA 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.