Internists do not deliver babies. Surgeons treat diseases, injuries, and deformities by operating on the body. A general surgeon is qualified to perform many common operations, but many specialize in one area of the body. Most of the services of M.D.'s and D.O.'s are covered by Medicare. They give regular checkups and routine dental and preventive care, fill cavities, remove teeth, provide dentures, and check for cancers in the mouth.
Dentists can prescribe medication and perform oral surgery.
Medicare will not pay for any dental care except for surgery on the jaw or facial bones. They also prescribe eyeglasses and contact lenses. Ophthalmologists can prescribe drugs and perform surgery. They often treat older people who have glaucoma and cataracts. Medicare helps pay for all medically necessary surgery or treatment of eye diseases and for exams and eyeglasses to correct vision after cataract surgery.