T63.33
Toxic effect of venom of brown recluse spider
T63.33 is a non-billable ICD-10-CM code header for toxic effect of venom of brown recluse spider. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are T63.331 Toxic effect of venom of brown recluse spider, accidental (unintentional); T63.332 Toxic effect of venom of brown recluse spider, intentional self-harm; T63.333 Toxic effect of venom of brown recluse spider, assault and T63.334 Toxic effect of venom of brown recluse spider, undetermined. Its coding notes include a Use additional code instruction, 1 Excludes1 entry and 3 Excludes2 entries.
7th characters
Every code below needs one of these (defined at T63).
The appropriate 7th character is to be added to each code from category T63
- Ainitial encounter
- Dsubsequent encounter
- Ssequela
Guidelines tips
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
The 7th character depends on whether the patient is in active treatment, not on who sees the patient. An aftercare Z code is not used for injury aftercare.
T36-T65 codes already include the substance and the intent, so no additional external cause code is required. Do not code directly from the Table of Drugs and Chemicals.
Use additional code
Add the listed code as a secondary code, if known.
Also from chapter/block level (5 notes)
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (2 notes)
- birth trauma (P10-P15)
- obstetric trauma (O70-O71)
Includes
Further defines or gives examples of the content of the category.
- bite or touch of venomous animal
- pricked or stuck by thorn or leaf
Notes
Also from chapter/block level (3 notes)
- When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
More specific codes under T63.33 4
- T63.331Toxic effect of venom of brown recluse spider, accidental (unintentional)7th char needed
- T63.332Toxic effect of venom of brown recluse spider, intentional self-harm7th char needed
- T63.333Toxic effect of venom of brown recluse spider, assault7th char needed
- T63.334Toxic effect of venom of brown recluse spider, undetermined7th char needed