ICD-10-CM > S00-T88 > T51-T65 > T63 > T63.4 > T63.42 > T63.421 T63.421 Toxic effect of venom of ants, accidental (unintentional) Non-Billable/Non-Specific Codes T63.421A..., initial encounterT63.421D..., subsequent encounterT63.421S..., sequela