(A) physicians’ services furnished by a physician (as defined in section 1395x(r)(1) of this title ), whether furnished in the office, the patient’s home, a hospital, or a nursing facility, or elsewhere, and (B) medical and surgical services furnished by a dentist (described in section 1395x(r)(2) of this title ) to the extent such services may be performed under State law either by a doctor of medicine or by a doctor of dental surgery or dental medicine and would be described in clause (A) if furnished by a physician (as defined in section 1395x(r)(1) of this title );