ICD-10-CM > S00-T88 > T36-T50 > T36 > T36.4 > T36.4X > T36.4X4 T36.4X4 Poisoning by tetracyclines, undetermined Non-Billable/Non-Specific Codes T36.4X4A..., initial encounterT36.4X4D..., subsequent encounterT36.4X4S..., sequela