ICD-10-CM > S00-T88 > T20-T25 > T20 > T20.6 > T20.61 > T20.612 T20.612 Corrosion of second degree of left ear [any part, except ear drum] Non-Billable/Non-Specific Codes T20.612A..., initial encounterT20.612D..., subsequent encounterT20.612S..., sequela