42 C.F.R. § 447.400
(a) States pay for services furnished by a physician as defined in § 440.50 of this chapter, or under the personal supervision of a physician who self-attests to a specialty designation of family medicine, general internal medicine or pediatric medicine or a subspecialty recognized by the American Board of Medical Specialties (ABMS), the American Board of Physician Specialties (ABPS) or the American Osteopathic Association (AOA). Such physician then attests that he/she:
(c) Primary care services designated in the Healthcare Common Procedure Coding System (HCPCS) are as follows:
(d)
(1) The state must submit to CMS, in such form and at such time as CMS specifies, information relating to participation by physicians described in paragraph (a) of this section and the utilization of E&M codes described in paragraph (c) of this section (whether furnished by or under the supervision of a physician described in paragraph (a)) of this section for the following peri—s—
[77 FR 66700, Nov. 6, 2012, as amended at 77 FR 74382, Dec. 14, 2012]