T63.304A — Toxic effect of unspecified spider venom, undetermined, initial encounter
Is T63.304A billable?
Yes, but T63.304A is an unspecified code. T63.304A is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, T63.304A 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 T63.304A — the more specific alternatives are listed below.
More specific alternatives
- T63.311AToxic effect of venom of black widow spider, accidental (unintentional), initial encounter
- T63.321AToxic effect of venom of tarantula, accidental (unintentional), initial encounter
- T63.331AToxic effect of venom of brown recluse spider, accidental (unintentional), initial encounter
- T63.391AToxic effect of venom of other spider, accidental (unintentional), initial encounter
T63.304A at a glance
| Code | T63.304A |
|---|---|
| Description | Toxic effect of unspecified spider venom, undetermined, 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 T63.304A?
In T63.304A, the 7th character A means initial encounter. The 7th character is required for T63.304A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T63.304A group to?
T63.304A sits in MDC 21 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.
- 917Poisoning and Toxic Effects of Drugs with MCCmedical
- 918Poisoning and Toxic Effects of Drugs without MCCmedical
Excludes1 — never code together — inherited from T51-T65
The conditions below can never be reported together with T63.304A 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 T63.304A to fully describe the condition. T63.304A 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 T63.304A to fully describe the condition. T63.304A is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T63.304A, but a patient may have both at the same time. When documentation supports it, T63.304A and the excluded code may both be reported.
Excludes2 — not included here — inherited from T63
The conditions below are not part of T63.304A, but a patient may have both at the same time. When documentation supports it, T63.304A and the excluded code may both be reported.
How long has T63.304A existed?
T63.304A 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.