ICD-10-CM > S00-T88 > T26-T28 > T28 > T28.9 > T28.91 T28.91 Corrosions of ear drum Non-Billable/Non-Specific Codes T28.911Corrosions of right ear drumT28.911A..., initial encounterT28.911D..., subsequent encounterT28.911S..., sequelaT28.912Corrosions of left ear drumT28.912A..., initial encounterT28.912D..., subsequent encounterT28.912S..., sequelaT28.919Corrosions of unspecified ear drumT28.919A..., initial encounterT28.919D..., subsequent encounterT28.919S..., sequela