T28.99XD — Corrosions of other internal organs, subsequent encounter
Is T28.99XD billable?
Yes — T28.99XD is billable for FY2027. T28.99XD is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T28.99XD may be submitted for encounters from October 1, 2026 through September 30, 2027.
T28.99XD at a glance
| Code | T28.99XD |
|---|---|
| Description | Corrosions of other internal organs, 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 T28.99XD?
In T28.99XD, the 7th character D means subsequent encounter. The 7th character is required for T28.99XD to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T28.99XD group to?
T28.99XD 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 T28.99XD listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T28.99, the nearest indexed parent of T28.99XD. Use them to find the family, then select the specific code.
- Corrosion › internal organ › specified organ NEC (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T28.9
The underlying condition below must be sequenced before T28.99XD. T28.99XD 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 T28.99XD to fully describe the condition. T28.99XD is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T28
Report an additional code alongside T28.99XD to fully describe the condition. T28.99XD is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T28.99XD, but a patient may have both at the same time. When documentation supports it, T28.99XD and the excluded code may both be reported.
How long has T28.99XD existed?
T28.99XD 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.