T25.591A — Corrosion of first degree of multiple sites of right ankle and foot, initial encounter
Is T25.591A billable?
Yes — T25.591A is billable for FY2027. T25.591A is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T25.591A may be submitted for encounters from October 1, 2026 through September 30, 2027.
T25.591A at a glance
| Code | T25.591A |
|---|---|
| Description | Corrosion of first degree of multiple sites of right ankle and foot, 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 T25.591A?
In T25.591A, the 7th character A means initial encounter. The 7th character is required for T25.591A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T25.591A group to?
T25.591A sits in MDC 22 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 935Non-Extensive Burnsmedical
How is T25.591A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T25.591, the nearest indexed parent of T25.591A. Use them to find the family, then select the specific code.
- Corrosion › lower › limb › multiple sites, except ankle and foot › ankle and foot › right › first degree (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T25.5
The underlying condition below must be sequenced before T25.591A. T25.591A 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 T25.591A to fully describe the condition. T25.591A 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 T25.591A to fully describe the condition. T25.591A is sequenced first.
Use additional code — inherited from T25.5
Report an additional code alongside T25.591A to fully describe the condition. T25.591A 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 T25.591A, but a patient may have both at the same time. When documentation supports it, T25.591A and the excluded code may both be reported.
How long has T25.591A existed?
T25.591A 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.