ICD-10-CM > S00-T88 > T51-T65 > T63 > T63.3 > T63.30 > T63.304 T63.304 Toxic effect of unspecified spider venom, undetermined Non-Billable/Non-Specific Codes T63.304A..., initial encounterT63.304D..., subsequent encounterT63.304S..., sequela