Oral surgery. This includes: reduction of a dislocation or fracture of the jaw or facial bone; excision of a benign or malignant tumor of the jaw; removal of impacted teeth that are fully or partially imbedded in the bone; removal of five or more teeth (includes wisdom teeth); gingivectomies involving two or more gum quadrants; and orthognathic surgery that is needed to correct a significant functional impairment that cannot be adequately corrected with orthodontic services.