T25.4 — Corrosion of unspecified degree of ankle and foot
Is T25.4 billable?
No — T25.4 is a non-billable header code. T25.4 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 36 billable codes beneath T25.4.
Billable codes under this header
- T25.411ACorrosion of unspecified degree of right ankle, initial encounter
- T25.411DCorrosion of unspecified degree of right ankle, subsequent encounter
- T25.411SCorrosion of unspecified degree of right ankle, sequela
- T25.412ACorrosion of unspecified degree of left ankle, initial encounter
- T25.412DCorrosion of unspecified degree of left ankle, subsequent encounter
- T25.412SCorrosion of unspecified degree of left ankle, sequela
- T25.419ACorrosion of unspecified degree of unspecified ankle, initial encounter
- T25.419DCorrosion of unspecified degree of unspecified ankle, subsequent encounter
- T25.419SCorrosion of unspecified degree of unspecified ankle, sequela
- T25.421ACorrosion of unspecified degree of right foot, initial encounter
- T25.421DCorrosion of unspecified degree of right foot, subsequent encounter
- T25.421SCorrosion of unspecified degree of right foot, sequela
- T25.422ACorrosion of unspecified degree of left foot, initial encounter
- T25.422DCorrosion of unspecified degree of left foot, subsequent encounter
- T25.422SCorrosion of unspecified degree of left foot, sequela
- T25.429ACorrosion of unspecified degree of unspecified foot, initial encounter
- T25.429DCorrosion of unspecified degree of unspecified foot, subsequent encounter
- T25.429SCorrosion of unspecified degree of unspecified foot, sequela
- T25.431ACorrosion of unspecified degree of right toe(s) (nail), initial encounter
- T25.431DCorrosion of unspecified degree of right toe(s) (nail), subsequent encounter
- T25.431SCorrosion of unspecified degree of right toe(s) (nail), sequela
- T25.432ACorrosion of unspecified degree of left toe(s) (nail), initial encounter
- T25.432DCorrosion of unspecified degree of left toe(s) (nail), subsequent encounter
- T25.432SCorrosion of unspecified degree of left toe(s) (nail), sequela
- T25.439ACorrosion of unspecified degree of unspecified toe(s) (nail), initial encounter
- T25.439DCorrosion of unspecified degree of unspecified toe(s) (nail), subsequent encounter
- T25.439SCorrosion of unspecified degree of unspecified toe(s) (nail), sequela
- T25.491ACorrosion of unspecified degree of multiple sites of right ankle and foot, initial encounter
- T25.491DCorrosion of unspecified degree of multiple sites of right ankle and foot, subsequent encounter
- T25.491SCorrosion of unspecified degree of multiple sites of right ankle and foot, sequela
- T25.492ACorrosion of unspecified degree of multiple sites of left ankle and foot, initial encounter
- T25.492DCorrosion of unspecified degree of multiple sites of left ankle and foot, subsequent encounter
- T25.492SCorrosion of unspecified degree of multiple sites of left ankle and foot, sequela
- T25.499ACorrosion of unspecified degree of multiple sites of unspecified ankle and foot, initial encounter
- T25.499DCorrosion of unspecified degree of multiple sites of unspecified ankle and foot, subsequent encounter
- T25.499SCorrosion of unspecified degree of multiple sites of unspecified ankle and foot, sequela
T25.4 at a glance
| Code | T25.4 |
|---|---|
| Description | Corrosion of unspecified degree of ankle and foot |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Code first
The underlying condition below must be sequenced before T25.4. T25.4 describes a manifestation and cannot be the principal or first-listed diagnosis.
- (T51-T65) to identify chemical and intent
Use additional code
Report an additional code alongside T25.4 to fully describe the condition. T25.4 is sequenced first.
- external cause code to identify place (Y92)
Use additional code — inherited from Chapter 19
Report an additional code alongside T25.4 to fully describe the condition. T25.4 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 T25.4 to fully describe the condition. T25.4 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T25.4, but a patient may have both at the same time. When documentation supports it, T25.4 and the excluded code may both be reported.
What codes fall under T25.4? (4)
How long has T25.4 existed?
T25.4 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.
What other codes are in the T25 family? (7)
- T25.0Burn of unspecified degree of ankle and footnot billable
- T25.1Burn of first degree of ankle and footnot billable
- T25.2Burn of second degree of ankle and footnot billable
- T25.3Burn of third degree of ankle and footnot billable
- T25.5Corrosion of first degree of ankle and footnot billable
- T25.6Corrosion of second degree of ankle and footnot billable
- T25.7Corrosion of third degree of ankle and footnot billable