The Commissioner is authorized to waive any of the requirements, conditions, or limitations of subchapter XVI (or to waive them only for specified purposes, or to impose additional requirements, conditions, or limitations) to such extent and for such period as the Commissioner finds necessary to carry out one or more experimental, pilot, or demonstration projects which, in the Commissioner’s judgment, are likely to assist in promoting the objectives or facilitate the administration of such subchapter. Any costs for benefits under or administration of any such project (including planning for the project and the review and evaluation of the project and its results), in excess of those that would have been incurred without regard to the project, shall be met by the Commissioner from amounts available to the Commissioner for this purpose from appropriations made to carry out such subchapter. The costs of any such project which is carried out in coordination with one or more related projects under other subchapters of this chapter shall be allocated among the appropriations available for such projects and any Trust Funds involved, in a manner determined by the Commissioner with respect to the old-age, survivors, and disability insurance programs under subchapter II and the supplemental security income program under subchapter XVI, and by the Secretary with respect to other subchapters of this chapter, taking into consideration the programs (or types of benefit) to which the project (or part of a project) is most closely related or which the project (or part of a project) is intended to benefit. If, in order to carry out a project under this subsection, the Commissioner requests a State to make supplementary payments (or the Commissioner makes them pursuant to an agreement under
section 1382e of this title) to individuals who are not eligible therefor, or in amounts or under circumstances in which the State does not make such payments, the Commissioner shall reimburse such State for the non-Federal share of such payments from amounts appropriated to carry out subchapter XVI. If, in order to carry out a project under this subsection, the Secretary requests a State to provide medical assistance under its plan approved under subchapter XIX to individuals who are not eligible therefor, or in amounts or under circumstances in which the State does not provide such medical assistance, the Secretary shall reimburse such State for the non-Federal share of such assistance from amounts appropriated to carry out subchapter XVI, which shall be provided by the Commissioner to the Secretary for this purpose.