or waive the rebate under this subparagraph with respect to a rebatable drug that is listed on the drug shortage list maintained by the Food and Drug Administration pursuant to section 506E of the Federal Food, Drug, and Cosmetic Act . (C) Request for reconsideration The Secretary shall establish procedures under which a manufacturer of a rebatable drug may request a reconsideration by the Secretary of the rebate amount specified under paragraph (3) for such rebatable drug and rebate period, as reported to the manufacturer pursuant to subparagraph (A)(iii). (2) Rebate period and Rebatable drug defined In this subsection: (A) Rebate period The term rebate period means a calendar quarter beginning on or after January 1, 2021. (B) Rebatable drug The term rebatable drug means a single source drug or biological (other than a biosimilar biological product)— (i) described in section 1842(o)(1)(C) for which the payment amount is provided under this section