45 C.F.R. § 156.215
Advance payments of the premium tax credit and cost-sharing reduction standards
(a) Standards relative to advance payments of the premium tax credit and cost-sharing reductions. In order for a health plan to be certified as a QHP initially and to maintain certification to be offered in the individual market on the Exchange, the issuer must meet the requirements related to the administration of cost-sharing reductions and advance payments of the premium tax credit set forth in subpart E of this part.
(b) [Reserved]