Notwithstanding any other provision of this subchapter, the Secretary shall establish a demonstration program under which States may provide under their State plans under this subchapter (including such a plan operating under a statewide waiver under section
1315 of this title) in accordance with this section for the provision of alternative benefits consistent with subsection (c) for eligible population groups in one or more geographic areas of the State specified by the State. An amendment under the previous sentence is referred to in this section as a “State demonstration program”.