ICD-10-CM > S00-T88 > T36-T50 > T44 > T44.6 > T44.6X > T44.6X6 T44.6X6 Underdosing of alpha-adrenoreceptor antagonists Non-Billable/Non-Specific Codes T44.6X6A..., initial encounterT44.6X6D..., subsequent encounterT44.6X6S..., sequela