ICD-10-CM > S00-T88 > T36-T50 > T48 > T48.3 > T48.3X > T48.3X6 T48.3X6 Underdosing of antitussives Non-Billable/Non-Specific Codes T48.3X6A..., initial encounterT48.3X6D..., subsequent encounterT48.3X6S..., sequela