regarding a claim for payment for such item or service, initiate open negotiations under this paragraph between such provider or facility and plan for purposes of determining, during the open negotiation period, an amount agreed on by such provider or facility, respectively, and such plan for payment (including any cost-sharing) for such item or service. For purposes of this subsection, the open negotiation period, with respect to an item or service, is the 30-day period beginning on the date of initiation of the negotiations with respect to such item or service. (B) Exchange of information In carrying out negotiations initiated under subparagraph (A), with respect to an item or service described in such subparagraph furnished in a year, not later than the fifth business day of the open negotiation period described in such subparagraph with respect to such item or service— (i) the health plan that is party to such negotiations shall notify the provider or facility that is party to such negotiations of the median contracted rate for such item or service and year