T20.40XS — Corrosion of unspecified degree of head, face, and neck, unspecified site, sequela
Is T20.40XS billable?
Yes, but T20.40XS is an unspecified code. T20.40XS is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T20.40XS 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 T20.40XS — the more specific alternatives are listed below.
More specific alternatives
- T20.10XSBurn of first degree of head, face, and neck, unspecified site, sequela
- T20.20XSBurn of second degree of head, face, and neck, unspecified site, sequela
- T20.30XSBurn of third degree of head, face, and neck, unspecified site, sequela
- T20.50XSCorrosion of first degree of head, face, and neck, unspecified site, sequela
- T20.60XSCorrosion of second degree of head, face, and neck, unspecified site, sequela
- T20.70XSCorrosion of third degree of head, face, and neck, unspecified site, sequela
T20.40XS at a glance
| Code | T20.40XS |
|---|---|
| Description | Corrosion of unspecified degree of head, face, and neck, 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 T20.40XS?
In T20.40XS, the 7th character S means sequela. The 7th character is required for T20.40XS to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T20.40XS group to?
T20.40XS 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 T20.40XS listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T20.40, the nearest indexed parent of T20.40XS. Use them to find the family, then select the specific code.
- Corrosion › head (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T20.4
The underlying condition below must be sequenced before T20.40XS. T20.40XS 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 T20.40XS to fully describe the condition. T20.40XS 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 T20.40XS to fully describe the condition. T20.40XS is sequenced first.
Use additional code — inherited from T20.4
Report an additional code alongside T20.40XS to fully describe the condition. T20.40XS 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 T20.40XS, but a patient may have both at the same time. When documentation supports it, T20.40XS and the excluded code may both be reported.
Excludes2 — not included here — inherited from T20
The conditions below are not part of T20.40XS, but a patient may have both at the same time. When documentation supports it, T20.40XS and the excluded code may both be reported.
How long has T20.40XS existed?
T20.40XS 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.