T23.442 — Corrosion of unspecified degree of multiple left fingers (nail), including thumb
Is T23.442 billable?
No — T23.442 is a non-billable header code. T23.442 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 T23.442.
Billable codes under this header
- T23.442ACorrosion of unspecified degree of multiple left fingers (nail), including thumb, initial encounter
- T23.442DCorrosion of unspecified degree of multiple left fingers (nail), including thumb, subsequent encounter
- T23.442SCorrosion of unspecified degree of multiple left fingers (nail), including thumb, sequela
T23.442 at a glance
| Code | T23.442 |
|---|---|
| Description | Corrosion of unspecified degree of multiple left fingers (nail), including thumb |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is T23.442 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to T23.442. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Corrosion › thumb › multiple sites with fingers › left (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Corrosion › finger › multiple sites › with thumb › left (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T23.4
The underlying condition below must be sequenced before T23.442. T23.442 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 T23.442 to fully describe the condition. T23.442 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 T23.442 to fully describe the condition. T23.442 is sequenced first.
Use additional code — inherited from T23.4
Report an additional code alongside T23.442 to fully describe the condition. T23.442 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 T23.442, but a patient may have both at the same time. When documentation supports it, T23.442 and the excluded code may both be reported.
What codes fall under T23.442? (3)
- T23.442ACorrosion of unspecified degree of multiple left fingers (nail), including thumb, initial encounter
- T23.442DCorrosion of unspecified degree of multiple left fingers (nail), including thumb, subsequent encounter
- T23.442SCorrosion of unspecified degree of multiple left fingers (nail), including thumb, sequela
How long has T23.442 existed?
T23.442 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.