ICD-10-CM > S00-T88 > T20-T25 > T20 > T20.7 > T20.71 > T20.712 T20.712 Corrosion of third degree of left ear [any part, except ear drum] Non-Billable/Non-Specific Codes T20.712A..., initial encounterT20.712D..., subsequent encounterT20.712S..., sequela