The Medicare Access and CHIP Reauthorization Act of 2015 (MACRA) changed the modified adjusted gross income (MAGI) ranges associated with Medicare Part B and Medicare prescription drug coverage premiums for years beginning in 2018. The Bipartisan Budget Act of 2018 (BBA 2018) revised the MAGI ranges again for years beginning with 2019. We consider a beneficiary's MAGI and tax filing status to determine: The percentage of the unsubsidized Medicare Part B premium that the beneficiary must pay; and the percentage of the cost of basic Medicare prescription drug coverage the beneficiary must pay. This final rule makes our regulations consistent with the MAGI ranges specified by MACRA and BBA 2018.