T28.90XA — Corrosions of unspecified internal organs, initial encounter
Is T28.90XA billable?
Yes, but T28.90XA is an unspecified code. T28.90XA is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T28.90XA 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 T28.90XA — the more specific alternatives are listed below.
More specific alternatives
- T28.0XXABurn of mouth and pharynx, initial encounter
- T28.1XXABurn of esophagus, initial encounter
- T28.2XXABurn of other parts of alimentary tract, initial encounter
- T28.3XXABurn of internal genitourinary organs, initial encounter
- T28.5XXACorrosion of mouth and pharynx, initial encounter
- T28.6XXACorrosion of esophagus, initial encounter
- T28.7XXACorrosion of other parts of alimentary tract, initial encounter
- T28.8XXACorrosion of internal genitourinary organs, initial encounter
T28.90XA at a glance
| Code | T28.90XA |
|---|---|
| Description | Corrosions of unspecified internal organs, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in T28.90XA?
In T28.90XA, the 7th character A means initial encounter. The 7th character is required for T28.90XA to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T28.90XA group to?
T28.90XA 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 T28.90XA listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T28.90, the nearest indexed parent of T28.90XA. Use them to find the family, then select the specific code.
- Corrosion › internal organ (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T28.9
The underlying condition below must be sequenced before T28.90XA. T28.90XA 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 T28.90XA to fully describe the condition. T28.90XA is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T28
Report an additional code alongside T28.90XA to fully describe the condition. T28.90XA is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T28.90XA, but a patient may have both at the same time. When documentation supports it, T28.90XA and the excluded code may both be reported.
How long has T28.90XA existed?
T28.90XA 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.