ICD-10-CM > S00-T88 > T36-T50 > T46 > T46.9 > T46.90 > T46.906 T46.906 Underdosing of unspecified agents primarily affecting the cardiovascular system Non-Billable/Non-Specific Codes T46.906A..., initial encounterT46.906D..., subsequent encounterT46.906S..., sequela