T23.51 — Corrosion of first degree of thumb (nail)
Is T23.51 billable?
No — T23.51 is a non-billable header code. T23.51 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 9 billable codes beneath T23.51.
Billable codes under this header
- T23.511ACorrosion of first degree of right thumb (nail), initial encounter
- T23.511DCorrosion of first degree of right thumb (nail), subsequent encounter
- T23.511SCorrosion of first degree of right thumb (nail), sequela
- T23.512ACorrosion of first degree of left thumb (nail), initial encounter
- T23.512DCorrosion of first degree of left thumb (nail), subsequent encounter
- T23.512SCorrosion of first degree of left thumb (nail), sequela
- T23.519ACorrosion of first degree of unspecified thumb (nail), initial encounter
- T23.519DCorrosion of first degree of unspecified thumb (nail), subsequent encounter
- T23.519SCorrosion of first degree of unspecified thumb (nail), sequela
T23.51 at a glance
| Code | T23.51 |
|---|---|
| Description | Corrosion of first degree of thumb (nail) |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Code first — inherited from T23.5
The underlying condition below must be sequenced before T23.51. T23.51 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 T23.51 to fully describe the condition. T23.51 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 T23.51 to fully describe the condition. T23.51 is sequenced first.
Use additional code — inherited from T23.5
Report an additional code alongside T23.51 to fully describe the condition. T23.51 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 T23.51, but a patient may have both at the same time. When documentation supports it, T23.51 and the excluded code may both be reported.
What codes fall under T23.51? (3)
How long has T23.51 existed?
T23.51 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 T23.5 family? (8)
- T23.50Corrosion of first degree of hand, unspecified sitenot billable
- T23.52Corrosion of first degree of single finger (nail) except thumbnot billable
- T23.53Corrosion of first degree of multiple fingers (nail), not including thumbnot billable
- T23.54Corrosion of first degree of multiple fingers (nail), including thumbnot billable
- T23.55Corrosion of first degree of palmnot billable
- T23.56Corrosion of first degree of back of handnot billable
- T23.57Corrosion of first degree of wristnot billable
- T23.59Corrosion of first degree of multiple sites of wrist and handnot billable