chronic kidney care practice guidelines, with nephrologists located in the geographic area in which the individual resides. (C) Flexibility in measure specification For purposes of subparagraph (A), the Secretary may specify measures that the Secretary develops for purposes of such subparagraph or that the Secretary did not develop for such purposes. (4) Waiving of cost-sharing A CKD–EDT practitioner that participates in the CKD early detection and treatment demonstration program shall, with respect to any CKD–EDT services for which payment is made under the payment system described in paragraph (2), accept any payment made under such paragraph for such services as payment in full for such services, and may not collect any amount of cost-sharing (including any amount of deductible, coinsurance, or copayment) from an enrolled CKD–EDT individual for the furnishing of such services to such individual. (5) Geographic distribution of providers To the extent practicable, the Secretary shall ensure (including through targeted outreach to physicians, nurse practitioners, and physician assistants that are primary care practitioners with respect to enrolled CKD–EDT individuals) that the individuals who receive CKD–EDT services for which payment is provided under the CKD early detection and treatment demonstration program are evenly distributed— (A) in different regions of the United States