ICD-10-CM > S00-T88 > T36-T50 > T49 > T49.6 > T49.6X > T49.6X6 T49.6X6 Underdosing of otorhinolaryngological drugs and preparations Non-Billable/Non-Specific Codes T49.6X6A..., initial encounterT49.6X6D..., subsequent encounterT49.6X6S..., sequela