T30.4 — Corrosion of unspecified body region, unspecified degree
Is T30.4 billable?
Yes, but T30.4 is an unspecified code. T30.4 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T30.4 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 T30.4 — the more specific alternatives are listed below.
More specific alternatives
T30.4 at a glance
| Code | T30.4 |
|---|---|
| Description | Corrosion of unspecified body region, unspecified degree |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does T30.4 group to?
T30.4 sits in MDC 22 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 935Non-Extensive Burnsmedical
How is T30.4 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to T30.4. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Inclusion terms
Alternative wording in documentation that is classified to T30.4.
- This code is not for inpatient use. Code to specified site and degree of corrosion
- Corrosion NOS
- Multiple corrosion NOS
Use additional code — inherited from Chapter 19
Report an additional code alongside T30.4 to fully describe the condition. T30.4 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T30.4, but a patient may have both at the same time. When documentation supports it, T30.4 and the excluded code may both be reported.
How long has T30.4 existed?
T30.4 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.