ICD-10-CM > S00-T88 > T36-T50 > T36 > T36.3 > T36.3X > T36.3X6 T36.3X6 Underdosing of macrolides Non-Billable/Non-Specific Codes T36.3X6A..., initial encounterT36.3X6D..., subsequent encounterT36.3X6S..., sequela