ICD-10-CM > S00-T88 > T36-T50 > T44 > T44.7 > T44.7X > T44.7X6 T44.7X6 Underdosing of beta-adrenoreceptor antagonists Non-Billable/Non-Specific Codes T44.7X6A..., initial encounterT44.7X6D..., subsequent encounterT44.7X6S..., sequela