period beginning on or after October 1, 1997, and before the date of the enactment of this subclause, the Secretary shall provide the hospital an opportunity to have a new adjustment in such limitation determined when the hospital begins training more than 3.0 full-time-equivalent residents in accordance with the methodology applicable to hospitals under the rules in effect as of October 1, 2015, and applied for cost reporting periods beginning on or after the date of the enactment of this subclause. . (c) Effective date The amendments made by this section shall apply to payment under section 1886 of the Social Security Act ( 42 U.S.C. 1395ww ) for cost reporting periods beginning on or after the date of the enactment of this Act.