ICD-10-CM > S00-T88 > T20-T25 > T20 > T20.5 > T20.51 T20.51 Corrosion of first degree of ear [any part, except ear drum] Non-Billable/Non-Specific Type 2 Excludes corrosion of ear drum (T28.91-) Codes T20.511Corrosion of first degree of right ear [any part, except ear drum]T20.511A..., initial encounterT20.511D..., subsequent encounterT20.511S..., sequelaT20.512Corrosion of first degree of left ear [any part, except ear drum]T20.512A..., initial encounterT20.512D..., subsequent encounterT20.512S..., sequelaT20.519Corrosion of first degree of unspecified ear [any part, except ear drum]T20.519A..., initial encounterT20.519D..., subsequent encounterT20.519S..., sequela