T23.509S — Corrosion of first degree of unspecified hand, unspecified site, sequela
Is T23.509S billable?
Yes, but T23.509S is an unspecified code. T23.509S is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T23.509S 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 T23.509S — the more specific alternatives are listed below.
More specific alternatives
- T23.511SCorrosion of first degree of right thumb (nail), sequela
- T23.521SCorrosion of first degree of single right finger (nail) except thumb, sequela
- T23.531SCorrosion of first degree of multiple right fingers (nail), not including thumb, sequela
- T23.541SCorrosion of first degree of multiple right fingers (nail), including thumb, sequela
- T23.551SCorrosion of first degree of right palm, sequela
- T23.561SCorrosion of first degree of back of right hand, sequela
- T23.571SCorrosion of first degree of right wrist, sequela
- T23.591SCorrosion of first degree of multiple sites of right wrist and hand, sequela
T23.509S at a glance
| Code | T23.509S |
|---|---|
| Description | Corrosion of first degree of unspecified hand, unspecified site, sequela |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "S" | sequela |
What does the 7th character "S" mean in T23.509S?
In T23.509S, the 7th character S means sequela. The 7th character is required for T23.509S to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T23.509S group to?
T23.509S sits in MDC 09 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.
- 604Trauma to the Skin, Subcutaneous Tissue and Breast with MCCmedical
- 605Trauma to the Skin, Subcutaneous Tissue and Breast without MCCmedical
How is T23.509S listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T23.509, the nearest indexed parent of T23.509S. Use them to find the family, then select the specific code.
- Corrosion › hand › first degree (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T23.5
The underlying condition below must be sequenced before T23.509S. T23.509S 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 T23.509S to fully describe the condition. T23.509S 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 T23.509S to fully describe the condition. T23.509S is sequenced first.
Use additional code — inherited from T23.5
Report an additional code alongside T23.509S to fully describe the condition. T23.509S 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 T23.509S, but a patient may have both at the same time. When documentation supports it, T23.509S and the excluded code may both be reported.
How long has T23.509S existed?
T23.509S 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.