; and (bb) 50 percent of essential retail pharmacies in such plan’s service area not described in item (aa). (II) Total reimbursement for essential retail pharmacies that are independent community pharmacies For plan years beginning on or after January 1, 2028, total reimbursement (as defined in subclause (V)(dd)) paid by a PDP sponsor to an essential retail pharmacy that is an independent community pharmacy for a covered part D drug shall not be lower than— (aa) in the case where National Average Drug Acquisition Cost information for such drug for retail community pharmacies or applicable non-retail community pharmacies has been available under section 1927(f) for at least one full plan year— (AA) if such information is available for such drug for retail community pharmacies, the average National Average Drug Acquisition Cost for such drug for retail community pharmacies for the most recent plan year for which such information is available; (BB) in the case where such information for retail community pharmacies is not available, the average National Average Drug Acquisition Cost for such drug for applicable non-retail pharmacies for the most recent plan year for which such information is available; (bb) in the case where National Average Drug Acquisition Cost information for such drug under section 1927(f) is not available for retail community pharmacies or applicable non-retail pharmacies, the wholesale acquisition cost (as defined in section 1847A(c)(6)(B)) for such drug; and (cc) in the case where National Average Drug Acquisition Cost information under section 1927(f) is available for such drug and ending on the date such survey information has been available for such drug but has not been available for a full plan year— (AA) the most recent National Average Drug Acquisition Cost for such drug for retail community pharmacies, if available