ICD-10-CM > S00-T88 > T36-T50 > T46 > T46.1 > T46.1X > T46.1X4 T46.1X4 Poisoning by calcium-channel blockers, undetermined Non-Billable/Non-Specific Codes T46.1X4A..., initial encounterT46.1X4D..., subsequent encounterT46.1X4S..., sequela