In general— Subject to paragraphs (2) and (3), in addition to the amount of payment that would otherwise be made under part B of title XVIII of the Social Security Act (
42 U.S.C. 1395j et seq.) for a biosimilar biological product furnished or dispensed by a participating provider to a Medicare beneficiary under the demonstration project, there shall be made an additional payment, in an amount determined by the Secretary, that reflects a portion of any difference between such amount of payment under such part, as compared to the amount of payment that would have been made under such part if the reference biological product had been furnished or dispensed to the beneficiary.