T27.4XXD — Corrosion of larynx and trachea, subsequent encounter
Is T27.4XXD billable?
Yes — T27.4XXD is billable for FY2027. T27.4XXD is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T27.4XXD may be submitted for encounters from October 1, 2026 through September 30, 2027.
T27.4XXD at a glance
| Code | T27.4XXD |
|---|---|
| Description | Corrosion of larynx and trachea, 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 T27.4XXD?
In T27.4XXD, the 7th character D means subsequent encounter. The 7th character is required for T27.4XXD to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T27.4XXD group to?
T27.4XXD 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 T27.4XXD listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T27.4, the nearest indexed parent of T27.4XXD. Use them to find the family, then select the specific code.
- Corrosion › epiglottis (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Corrosion › larynx (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Corrosion › trachea (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first
The underlying condition below must be sequenced before T27.4XXD. T27.4XXD describes a manifestation and cannot be the principal or first-listed diagnosis.
- (T51-T65) to identify chemical and intent
Code first — inherited from T27.4
The underlying condition below must be sequenced before T27.4XXD. T27.4XXD 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 T27.4XXD to fully describe the condition. T27.4XXD is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T27
Report an additional code alongside T27.4XXD to fully describe the condition. T27.4XXD is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T27.4XXD, but a patient may have both at the same time. When documentation supports it, T27.4XXD and the excluded code may both be reported.
How long has T27.4XXD existed?
T27.4XXD 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.