ICD-10-CM > S00-T88 > T36-T50 > T47 > T47.0 > T47.0X > T47.0X4 T47.0X4 Poisoning by histamine H2-receptor blockers, undetermined Non-Billable/Non-Specific Codes T47.0X4A..., initial encounterT47.0X4D..., subsequent encounterT47.0X4S..., sequela