ICD-10-CM > S00-T88 > T51-T65 > T63 > T63.0 > T63.00 > T63.004 T63.004 Toxic effect of unspecified snake venom, undetermined Non-Billable/Non-Specific Codes T63.004A..., initial encounterT63.004D..., subsequent encounterT63.004S..., sequela