In general

In the case of covered professional services furnished by an eligible professional during a year that is in the period beginning with 2019 and ending with 2026, and during 2028, and for which the professional is a qualifying APM participant with respect to such year, in addition to the amount of payment that would otherwise be made for such covered professional services under this part for such year, there also shall be paid to such professional an amount equal to 5 percent (or, with respect to 2025, 3.5 percent, or, with respect to 2026, 1.88 percent, or, with respect to 2028, 3.1 percent) of the estimated aggregate payment amounts for such covered professional services under this part for the preceding year. For purposes of the previous sentence, the payment amount for the preceding year may be an estimation for the full preceding year based on a period of such preceding year that is less than the full year. The Secretary shall establish policies to implement this subparagraph in cases in which payment for covered professional services furnished by a qualifying APM participant in an alternative payment model—