ICD-10-CM > S00-T88 > T20-T25 > T20 > T20.7 > T20.71 > T20.719 T20.719 Corrosion of third degree of unspecified ear [any part, except ear drum] Non-Billable/Non-Specific Codes T20.719A..., initial encounterT20.719D..., subsequent encounterT20.719S..., sequela