Participating issuer means any issuer offering a plan that participates in the specific function that is funded by user fees. This term may include: health insurance issuers, QHP issuers, issuers of multi-State plans (as defined in § 155.1000(a) of this subchapter), issuers of stand-alone dental plans (as described in § 155.1065 of this subtitle), or other issuers identified by an Exchange.
45 C.F.R. §156.50