; and (B) no site shall be added to the covered entity identification system established under subsection (d)(2)(B)(iv) or be permitted to begin participating in the drug discount program under this section, as a child site or otherwise, on the basis of association with a covered entity described in paragraph (4)(L) unless such site was identified as a child site as of December 31, 2017, under the system established under subsection (d)(2)(B)(iv). (12) Regulations to be issued during the moratorium period to implement statutory requirements clarifying hospital eligibility criteria and hospital child site standards and enhancing hospital transparency (A) Issuance of regulations (i) In general During the moratorium period under paragraph (11), the Secretary shall promulgate regulations through notice and comment rulemaking to implement the standards and requirements described in subparagraph (B). (ii) Deadline Such final regulations shall be promulgated and take effect— (I) before the end date of the moratorium described in paragraph (11)