T22.549 — Corrosion of first degree of unspecified axilla
Is T22.549 billable?
No — T22.549 is a non-billable header code. T22.549 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 T22.549.
T22.549 at a glance
| Code | T22.549 |
|---|---|
| Description | Corrosion of first degree of unspecified axilla |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is T22.549 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to T22.549. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Corrosion › axilla › first degree (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T22.5
The underlying condition below must be sequenced before T22.549. T22.549 describes a manifestation and cannot be the principal or first-listed diagnosis.
- (T51-T65) to identify chemical and intent
Use additional code — inherited from Chapter 19
Report an additional code alongside T22.549 to fully describe the condition. T22.549 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T20-T25
Report an additional code alongside T22.549 to fully describe the condition. T22.549 is sequenced first.
Use additional code — inherited from T22.5
Report an additional code alongside T22.549 to fully describe the condition. T22.549 is sequenced first.
- external cause code to identify place (Y92)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T22.549, but a patient may have both at the same time. When documentation supports it, T22.549 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T22
The conditions below are not part of T22.549, but a patient may have both at the same time. When documentation supports it, T22.549 and the excluded code may both be reported.
What codes fall under T22.549? (3)
How long has T22.549 existed?
T22.549 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.