42 CFR § 440.50 - Physicians' services and medical and surgical services of a dentist.
(1) Within the scope of practice of medicine or osteopathy as defined by State law; and
(2) By or under the personal supervision of an individual licensed under State law to practice medicine or osteopathy.
(b) “Medical and surgical services of a dentist” means medical and surgical services furnished, on or after January 1, 1988, by a doctor of dental medicine or dental surgery if the services are services that -
(3) Are furnished by a doctor of dental medicine or dental surgery who is authorized to furnish those services in the State in which he or she furnished the services.