; and (2) by adding at the end the following new subsection: (cc) Collection of coinsurance only for portion of rebatable single-Dose vial drug administered When processing a claim for a rebatable single-dose vial drug (as defined in section 1834(w)(6)), the Secretary, acting through the relevant Medicare administrative contractor with respect to such claim, shall only collect coinsurance from a beneficiary, taking into account any coverage under a Medicare supplemental policy certified under section 1882 or any other supplemental insurance coverage of the beneficiary, with respect to the portion of the drug administered (as indicated by the J-portion of the claim for the drug used as of the date of enactment of this subsection, or any successor code that includes such data as determined appropriate by the Secretary), in an amount equal to 20 percent of the amount of payment that would be made if payment for the claim was based only on the portion of the drug administered (as so indicated). Nothing in the preceding sentence shall affect the amount paid to the provider of services or supplier with respect to the drug under this part (as determined based on the total amount of the drug for which the claim was submitted, including the portion of the drug administered and the portion discarded, as indicated by the J-portion of the claim and the JW modifier, respectively, used as of such date of enactment or any successor codes that include such data as determined appropriate by the Secretary). .