ICD-10-CM > S00-T88 > T36-T50 > T42 > T42.0 > T42.0X > T42.0X4 T42.0X4 Poisoning by hydantoin derivatives, undetermined Non-Billable/Non-Specific Codes T42.0X4A..., initial encounterT42.0X4D..., subsequent encounterT42.0X4S..., sequela