T61.91XD — Toxic effect of unspecified seafood, accidental (unintentional), subsequent encounter
Is T61.91XD billable?
Yes, but T61.91XD is an unspecified code. T61.91XD is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T61.91XD 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 T61.91XD — the more specific alternatives are listed below.
More specific alternatives
- T61.01XDCiguatera fish poisoning, accidental (unintentional), subsequent encounter
- T61.11XDScombroid fish poisoning, accidental (unintentional), subsequent encounter
- T61.771DOther fish poisoning, accidental (unintentional), subsequent encounter
- T61.8X1DToxic effect of other seafood, accidental (unintentional), subsequent encounter
T61.91XD at a glance
| Code | T61.91XD |
|---|---|
| Description | Toxic effect of unspecified seafood, accidental (unintentional), 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 T61.91XD?
In T61.91XD, the 7th character D means subsequent encounter. The 7th character is required for T61.91XD to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T61.91XD group to?
T61.91XD 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 T61.91XD listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T61.9, the nearest indexed parent of T61.91XD. Use them to find the family, then select the specific code.
- Poisoning › fish (acute)
- Poisoning › seafood (acute)
Excludes1 — never code together — inherited from T51-T65
The conditions below can never be reported together with T61.91XD 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.-)
Excludes1 — never code together — inherited from T61
The conditions below can never be reported together with T61.91XD on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- allergic reaction to food, such as:
- anaphylactic reaction or shock due to adverse food reaction (T78.0-)
- bacterial foodborne intoxications (A05.-)
- dermatitis (L23.6, L25.4, L27.2)
- food protein-induced enterocolitis syndrome (K52.21)
- food protein-induced enteropathy (K52.22)
- gastroenteritis (noninfective) (K52.29)
- toxic effect of aflatoxin and other mycotoxins (T64)
- toxic effect of cyanides (T65.0-)
- toxic effect of harmful algae bloom (T65.82-)
- toxic effect of hydrogen cyanide (T57.3-)
- toxic effect of mercury (T56.1-)
- toxic effect of red tide (T65.82-)
Use additional code — inherited from Chapter 19
Report an additional code alongside T61.91XD to fully describe the condition. T61.91XD 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 T61.91XD to fully describe the condition. T61.91XD is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T61.91XD, but a patient may have both at the same time. When documentation supports it, T61.91XD and the excluded code may both be reported.
How long has T61.91XD existed?
T61.91XD 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.