ICD-10-CM > S00-T88 > T51-T65 > T63 > T63.0 > T63.01 > T63.014 T63.014 Toxic effect of rattlesnake venom, undetermined Non-Billable/Non-Specific Codes T63.014A..., initial encounterT63.014D..., subsequent encounterT63.014S..., sequela