T65.94XD — Toxic effect of unspecified substance, undetermined, subsequent encounter
Is T65.94XD billable?
Yes, but T65.94XD is an unspecified code. T65.94XD is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T65.94XD 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 T65.94XD.
T65.94XD at a glance
| Code | T65.94XD |
|---|---|
| Description | Toxic effect of unspecified substance, undetermined, 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 T65.94XD?
In T65.94XD, the 7th character D means subsequent encounter. The 7th character is required for T65.94XD to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T65.94XD group to?
T65.94XD 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
Excludes1 — never code together — inherited from T51-T65
The conditions below can never be reported together with T65.94XD on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- contact with and (suspected) exposure to toxic substances (Z77.-)
Use additional code — inherited from Chapter 19
Report an additional code alongside T65.94XD to fully describe the condition. T65.94XD is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T51-T65
Report an additional code alongside T65.94XD to fully describe the condition. T65.94XD is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T65.94XD, but a patient may have both at the same time. When documentation supports it, T65.94XD and the excluded code may both be reported.
How long has T65.94XD existed?
T65.94XD 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.