T23.642 — Corrosion of second degree of multiple left fingers (nail), including thumb
Is T23.642 billable?
No — T23.642 is a non-billable header code. T23.642 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 T23.642.
Billable codes under this header
T23.642 at a glance
| Code | T23.642 |
|---|---|
| Description | Corrosion of second 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 T23.642 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to T23.642. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Corrosion › thumb › multiple sites with fingers › left › second degree (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Corrosion › finger › multiple sites › with thumb › left › second degree (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T23.6
The underlying condition below must be sequenced before T23.642. T23.642 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 T23.642 to fully describe the condition. T23.642 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 T23.642 to fully describe the condition. T23.642 is sequenced first.
Use additional code — inherited from T23.6
Report an additional code alongside T23.642 to fully describe the condition. T23.642 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 T23.642, but a patient may have both at the same time. When documentation supports it, T23.642 and the excluded code may both be reported.
What codes fall under T23.642? (3)
How long has T23.642 existed?
T23.642 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.