T28.7XXA — Corrosion of other parts of alimentary tract, initial encounter
Is T28.7XXA billable?
Yes — T28.7XXA is billable for FY2027. T28.7XXA is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T28.7XXA may be submitted for encounters from October 1, 2026 through September 30, 2027.
T28.7XXA at a glance
| Code | T28.7XXA |
|---|---|
| Description | Corrosion of other parts of alimentary tract, 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 T28.7XXA?
In T28.7XXA, the 7th character A means initial encounter. The 7th character is required for T28.7XXA to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T28.7XXA group to?
T28.7XXA sits in MDC 06 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 393Other Digestive System Diagnoses with MCCmedical
- 394Other Digestive System Diagnoses with CCmedical
- 395Other Digestive System Diagnoses without CC/MCCmedical
As a secondary diagnosis, T28.7XXA is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG. It also carries Hospital-Acquired Condition category 05.
How is T28.7XXA listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T28.7, the nearest indexed parent of T28.7XXA. Use them to find the family, then select the specific code.
- Corrosion › alimentary tract NEC (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Corrosion › colon (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Corrosion › gastrointestinal tract NEC (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Corrosion › intestine (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Corrosion › rectum (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Corrosion › stomach (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
- Burn › gastrointestinal tract NEC › from swallowing caustic or corrosive substance (electricity) (flame) (hot gas, liquid or hot object) (radiation) (steam) (thermal)
- Corrosion › internal organ › alimentary tract (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first
The underlying condition below must be sequenced before T28.7XXA. T28.7XXA describes a manifestation and cannot be the principal or first-listed diagnosis.
- (T51-T65) to identify chemical and intent
Code first — inherited from T28.7
The underlying condition below must be sequenced before T28.7XXA. T28.7XXA 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 T28.7XXA to fully describe the condition. T28.7XXA is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T28
Report an additional code alongside T28.7XXA to fully describe the condition. T28.7XXA is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T28.7XXA, but a patient may have both at the same time. When documentation supports it, T28.7XXA and the excluded code may both be reported.
How long has T28.7XXA existed?
T28.7XXA 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.