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T63.331 vs T63.334

T63.331 (Toxic effect of venom of brown recluse spider, accidental (unintentional)) compared with T63.334 (Toxic effect of venom of brown recluse spider, undetermined), from the official CMS tabular data. T63.331 and T63.334 code the same substance (Brown) with a different intent.

Relationship

Informational

Drug table relationship

T63.331
Toxic effect of venom of brown recluse spider, accidental (unintentional)
↔
T63.334
Toxic effect of venom of brown recluse spider, undetermined

Same substance, different circumstance of exposure.

Same substance — undetermined intent (Brown)

Accidental poisoning, intentional self-harm, assault, undetermined intent, adverse effect and underdosing are mutually exclusive columns — exactly one applies to a given encounter.

Source: CMS Table of Drugs and Chemicals

Can these codes be reported together?

Same substance, different intent. T63.331 and T63.334 code the same substance (Brown) with a different circumstance of exposure.

From the CMS Table of Drugs and Chemicals: accidental poisoning, intentional self-harm, assault, undetermined intent, adverse effect and underdosing are mutually exclusive columns — only one of them applies to a given encounter.

Side by side

T63.331Toxic effect of venom of brown recluse spider, accidental (unintentional)T63.334Toxic effect of venom of brown recluse spider, undetermined
Billing statusNon-billable headerNon-billable header
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionToxic effect of venom of brown recluse spider, accidental (unintentional) is a non-billable ICD-10-CM category code (T63.331).Toxic effect of venom of brown recluse spider, undetermined is a non-billable ICD-10-CM category code (T63.334).
7th characterThe appropriate 7th character is to be added to each code from category T63The appropriate 7th character is to be added to each code from category T63
Includes
bite or touch of venomous animal
pricked or stuck by thorn or leaf
bite or touch of venomous animal
pricked or stuck by thorn or leaf
Use additional code
code(s):
for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
personal history of foreign body fully removed (Z87.821)
code(s):
for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
personal history of foreign body fully removed (Z87.821)
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources