T23.44 — Corrosion of unspecified degree of multiple fingers (nail), including thumb
Is T23.44 billable?
No — T23.44 is a non-billable header code. T23.44 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 T23.44.
Billable codes under this header
- T23.441ACorrosion of unspecified degree of multiple right fingers (nail), including thumb, initial encounter
- T23.441DCorrosion of unspecified degree of multiple right fingers (nail), including thumb, subsequent encounter
- T23.441SCorrosion of unspecified degree of multiple right fingers (nail), including thumb, sequela
- 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
- T23.449ACorrosion of unspecified degree of unspecified multiple fingers (nail), including thumb, initial encounter
- T23.449DCorrosion of unspecified degree of unspecified multiple fingers (nail), including thumb, subsequent encounter
- T23.449SCorrosion of unspecified degree of unspecified multiple fingers (nail), including thumb, sequela
T23.44 at a glance
| Code | T23.44 |
|---|---|
| Description | Corrosion of unspecified degree of multiple fingers (nail), including thumb |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Code first — inherited from T23.4
The underlying condition below must be sequenced before T23.44. T23.44 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 T23.44 to fully describe the condition. T23.44 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 T23.44 to fully describe the condition. T23.44 is sequenced first.
Use additional code — inherited from T23.4
Report an additional code alongside T23.44 to fully describe the condition. T23.44 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 T23.44, but a patient may have both at the same time. When documentation supports it, T23.44 and the excluded code may both be reported.
What codes fall under T23.44? (3)
- T23.441Corrosion of unspecified degree of multiple right fingers (nail), including thumbnot billable
- T23.442Corrosion of unspecified degree of multiple left fingers (nail), including thumbnot billable
- T23.449Corrosion of unspecified degree of unspecified multiple fingers (nail), including thumbnot billable
How long has T23.44 existed?
T23.44 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 T23.4 family? (8)
- T23.40Corrosion of unspecified degree of hand, unspecified sitenot billable
- T23.41Corrosion of unspecified degree of thumb (nail)not billable
- T23.42Corrosion of unspecified degree of single finger (nail) except thumbnot billable
- T23.43Corrosion of unspecified degree of multiple fingers (nail), not including thumbnot billable
- T23.45Corrosion of unspecified degree of palmnot billable
- T23.46Corrosion of unspecified degree of back of handnot billable
- T23.47Corrosion of unspecified degree of wristnot billable
- T23.49Corrosion of unspecified degree of multiple sites of wrist and handnot billable