ICD-10-CM > S00-T88 > T51-T65 > T63 > T63.3 > T63.33 > T63.331 T63.331 Toxic effect of venom of brown recluse spider, accidental (unintentional) Non-Billable/Non-Specific Codes T63.331A..., initial encounterT63.331D..., subsequent encounterT63.331S..., sequela