ICD-10-CM > S00-T88 > T36-T50 > T49 > T49.5 > T49.5X > T49.5X6 T49.5X6 Underdosing of ophthalmological drugs and preparations Non-Billable/Non-Specific Codes T49.5X6A..., initial encounterT49.5X6D..., subsequent encounterT49.5X6S..., sequela