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; and removal of impacted teeth that are fully or partially imbedded in the bone and orthognathic surgery that is needed to correct a significant functional impairment that cannot be adequately corrected with orthodontic services when the member has a serious medical condition that requires admission to a Surgical Day Care Unit of a hospital or to an Ambulatory Surgical Facility in order for the surgery to be safely performed. These benefits are also provided when the surgery is furnished at an oral surgeon's office.