; or (ii) a postdoctoral resident who has obtained a doctoral degree in psychology, is seeking a license to practice psychology, and is engaged in a 1- or 2-year period of additional supervised experiential training to acquire the skills or hours required for licensure through a program accredited by the American Psychological Association or a member of the Association of Psychology Postdoctoral and Internship Centers. (B) The term general supervision means, with respect to a service, that the service is furnished under the overall direction and control of a clinical psychologist (as defined for purposes of paragraph (1)), but the supervising psychologist's presence is not required during the furnishing of the service. . (2) Effective date The amendments made by this subsection shall apply to services furnished on or after the date that is 1 year after the date of the enactment of this Act. (b) Development of GC modifier code Not later than 1 year after the date of the enactment of this Act, the Secretary of Health and Human Services shall develop a GC modifier code to identify and accurately bill for services furnished by an advanced psychology trainee pursuant to the amendments made by subsection (a). 3. Guidance to States on coverage of services provided by advanced psychology trainees under Medicaid and CHIP Not later than 1 year after the date of enactment of this Act, the Secretary of Health and Human Services shall issue and disseminate guidance to States on strategies to overcome existing barriers to coverage of services furnished by advanced psychology trainees (as defined under section 1861(ii)(2) of the Social Security Act, as added by section 2(a), through the Medicaid program under title XIX of the Social Security Act ( 42 U.S.C. 1396 et seq. ) and the Children’s Health Insurance Program under title XXI of such Act ( 42 U.S.C. 1397aa et seq. )). Such guidance shall include technical assistance and best practices regarding each of the following: (1) Recommended legal mechanisms for activating coverage