ICD-10-CM > S00-T88 > T20-T25 > T20 > T20.5 > T20.51 > T20.519 T20.519 Corrosion of first degree of unspecified ear [any part, except ear drum] Non-Billable/Non-Specific Codes T20.519A..., initial encounterT20.519D..., subsequent encounterT20.519S..., sequela