ICD-10-CM > S00-T88 > T36-T50 > T46 > T46.3 > T46.3X > T46.3X6 T46.3X6 Underdosing of coronary vasodilators Non-Billable/Non-Specific Codes T46.3X6A..., initial encounterT46.3X6D..., subsequent encounterT46.3X6S..., sequela