T25.439D — Corrosion of unspecified degree of unspecified toe(s) (nail), subsequent encounter
Is T25.439D billable?
Yes, but T25.439D is an unspecified code. T25.439D is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T25.439D 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 T25.439D — the more specific alternatives are listed below.
More specific alternatives
- T25.111DBurn of first degree of right ankle, subsequent encounter
- T25.211DBurn of second degree of right ankle, subsequent encounter
- T25.311DBurn of third degree of right ankle, subsequent encounter
- T25.511DCorrosion of first degree of right ankle, subsequent encounter
- T25.611DCorrosion of second degree of right ankle, subsequent encounter
- T25.711DCorrosion of third degree of right ankle, subsequent encounter
T25.439D at a glance
| Code | T25.439D |
|---|---|
| Description | Corrosion of unspecified degree of unspecified toe(s) (nail), 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 T25.439D?
In T25.439D, the 7th character D means subsequent encounter. The 7th character is required for T25.439D to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T25.439D group to?
T25.439D 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 T25.439D listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T25.439, the nearest indexed parent of T25.439D. Use them to find the family, then select the specific code.
- Corrosion › toe (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T25.4
The underlying condition below must be sequenced before T25.439D. T25.439D 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 T25.439D to fully describe the condition. T25.439D 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 T25.439D to fully describe the condition. T25.439D is sequenced first.
Use additional code — inherited from T25.4
Report an additional code alongside T25.439D to fully describe the condition. T25.439D 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 T25.439D, but a patient may have both at the same time. When documentation supports it, T25.439D and the excluded code may both be reported.
How long has T25.439D existed?
T25.439D 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.