; (B) in urban and rural areas; and (C) among appropriate facilities, including— (i) federally qualified health centers; and (ii) community health centers that receive assistance under section 330 of the Public Health Service Act. (6) Duration and scope of demonstration (A) Three-year minimum Subject to subparagraph (C), the Secretary shall conduct the CKD early detection and treatment demonstration program for a period of three years. (B) Scope Subject to subparagraph (C), the Secretary shall enroll, subject to paragraph (10), not more than 5,000 CKD–EDT individuals for participation in the demonstration program. Such an individual may participate in the demonstration program on a voluntary basis and may terminate participation at any time. (C) Option to extend The Secretary may, through rulemaking, expand (including implementation on a nationwide basis) the duration and the scope of the CKD early detection and treatment demonstration program, to the extent determined appropriate by the Secretary, if— (i) the Secretary determines that such expansion is expected to— (I) reduce spending under this title without reducing the quality of care; or (II) improve the quality of patient care without increasing spending under this title; (ii) the Chief Actuary of the Centers for Medicare & Medicaid Services certifies that such expansion would reduce (or would not result in any increase in) net program spending under this title