T20.51 - Corrosion of first degree of ear [any part, except ear drum] T20.5 - Corrosion of first degree of head, face, and neck T20.51 - Corrosion of first degree of ear [any part, except ear drum] T20.511 - Corrosion of first degree of right ear [any part, except ear drum] T20.512 - Corrosion of first degree of left ear [any part, except ear drum] T20.519 - Corrosion of first degree of unspecified ear [any part, except ear drum]