T23.599D — Corrosion of first degree of multiple sites of unspecified wrist and hand, subsequent encounter
Is T23.599D billable?
Yes, but T23.599D is an unspecified code. T23.599D is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T23.599D 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 T23.599D — the more specific alternatives are listed below.
T23.599D at a glance
| Code | T23.599D |
|---|---|
| Description | Corrosion of first degree of multiple sites of unspecified wrist and hand, subsequent encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "D" | subsequent encounter |
What does the 7th character "D" mean in T23.599D?
In T23.599D, the 7th character D means subsequent encounter. The 7th character is required for T23.599D to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T23.599D group to?
T23.599D sits in MDC 23 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.
- 949Aftercare with CC/MCCmedical
- 950Aftercare without CC/MCCmedical
How is T23.599D listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T23.599, the nearest indexed parent of T23.599D. Use them to find the family, then select the specific code.
- Corrosion › hand › multiple sites with wrist › first degree (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Corrosion › wrist › multiple sites with hand › first degree (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T23.5
The underlying condition below must be sequenced before T23.599D. T23.599D 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 T23.599D to fully describe the condition. T23.599D 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 T23.599D to fully describe the condition. T23.599D is sequenced first.
Use additional code — inherited from T23.5
Report an additional code alongside T23.599D to fully describe the condition. T23.599D 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 T23.599D, but a patient may have both at the same time. When documentation supports it, T23.599D and the excluded code may both be reported.
How long has T23.599D existed?
T23.599D 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.