Upon request, a carrier shall provide to a provider to which the carrier has decided not to offer the opportunity to participate or that the carrier has decided not to include as a participating provider in any of the carrier’s provider networks a written explanation of the reason for the carrier’s decision. The written explanation provided by the carrier must indicate whether the reason for not offering the provider the opportunity to contract or for not including the provider in any network was related to the provider’s performance with respect to quality, cost or cost-efficiency.