ICD-10-CM > S00-T88 > T36-T50 > T42 > T42.3 > T42.3X > T42.3X4 T42.3X4 Poisoning by barbiturates, undetermined Non-Billable/Non-Specific Codes T42.3X4A..., initial encounterT42.3X4D..., subsequent encounterT42.3X4S..., sequela