T20.419 - Corrosion of unspecified degree of unspecified ear [any part, except ear drum] T20.4 - Corrosion of unspecified degree of head, face, and neck T20.41 - Corrosion of unspecified degree of ear [any part, except ear drum] T20.419 - Corrosion of unspecified degree of unspecified ear [any part, except ear drum]