ICD-10-CM > S00-T88 > T36-T50 > T49 > T49.8 > T49.8X > T49.8X6 T49.8X6 Underdosing of other topical agents Non-Billable/Non-Specific Codes T49.8X6A..., initial encounterT49.8X6D..., subsequent encounterT49.8X6S..., sequela