; limitation Payment permitted under clause (i) shall be made on a monthly basis, and the period of rental may not exceed one month. (iii) Payment amount The amount of payment allowed under clause (i) for a month for the rental of a CRT item shall be 10 percent of the purchase price for the CRT item. (F) Replacement of items (i) Establishment of reasonable useful lifetime In accordance with clause (ii), not later than two years of the date of enactment of this subsection, the Secretary shall determine and establish, through a rulemaking process involving advance public notice and an opportunity for stakeholder input and public comments, a reasonable useful lifetime for CRT items for which payment may be made under this paragraph. (ii) Length of reasonable useful lifetime The reasonable useful lifetime of items of CRT items under this subsection shall be established based on the intended use and continued efficacy, but shall not in any event exceed five years for any CRT item. The Secretary shall ensure that the length of reasonable useful lifetime is appropriate for each sub-category of items within the CRT category. (G) Exclusive payment rule This subsection shall constitute the exclusive provision under this title for payment for CRT items under this part. (2) Conditions for payment (A) Limitation on payment No payment shall be made under this subsection for a CRT item unless such CRT item— (i) meets the clinical conditions for payment set forth under subparagraph (B)