T27.7XXS — Corrosion of respiratory tract, part unspecified, sequela
Is T27.7XXS billable?
Yes, but T27.7XXS is an unspecified code. T27.7XXS is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T27.7XXS 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 T27.7XXS — the more specific alternatives are listed below.
More specific alternatives
- T27.0XXSBurn of larynx and trachea, sequela
- T27.1XXSBurn involving larynx and trachea with lung, sequela
- T27.2XXSBurn of other parts of respiratory tract, sequela
- T27.4XXSCorrosion of larynx and trachea, sequela
- T27.5XXSCorrosion involving larynx and trachea with lung, sequela
- T27.6XXSCorrosion of other parts of respiratory tract, sequela
T27.7XXS at a glance
| Code | T27.7XXS |
|---|---|
| Description | Corrosion of respiratory tract, part unspecified, 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 T27.7XXS?
In T27.7XXS, the 7th character S means sequela. The 7th character is required for T27.7XXS to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T27.7XXS group to?
T27.7XXS 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 T27.7XXS listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T27.7, the nearest indexed parent of T27.7XXS. Use them to find the family, then select the specific code.
- Corrosion › respiratory tract (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first
The underlying condition below must be sequenced before T27.7XXS. T27.7XXS describes a manifestation and cannot be the principal or first-listed diagnosis.
- (T51-T65) to identify chemical and intent
Code first — inherited from T27.7
The underlying condition below must be sequenced before T27.7XXS. T27.7XXS 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 T27.7XXS to fully describe the condition. T27.7XXS is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T27
Report an additional code alongside T27.7XXS to fully describe the condition. T27.7XXS is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T27.7XXS, but a patient may have both at the same time. When documentation supports it, T27.7XXS and the excluded code may both be reported.
How long has T27.7XXS existed?
T27.7XXS 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.