ICD-10-CM > S00-T88 > T36-T50 > T46 > T46.1 > T46.1X > T46.1X5 T46.1X5 Adverse effect of calcium-channel blockers Non-Billable/Non-Specific Codes T46.1X5A..., initial encounterT46.1X5D..., subsequent encounterT46.1X5S..., sequela