ICD-10-CM > S00-T88 > T36-T50 > T37 > T37.5 > T37.5X > T37.5X4 T37.5X4 Poisoning by antiviral drugs, undetermined Non-Billable/Non-Specific Codes T37.5X4A..., initial encounterT37.5X4D..., subsequent encounterT37.5X4S..., sequela