described in subparagraph (E)) shall be applied to such standard prospective payment amounts. (E) Transitional adjustments to home health groupings model In order to provide for a transition to the home health groupings model, the Secretary shall, after application of adjustments described in subparagraph (D)(ii), increase payment amounts under clause (iii) as follows: (i) For 2020, the increase shall be 1.5 percent. (ii) For 2021, the increase shall be 1.0 percent. (iii) For 2022, the increase shall be 0.5 percent. (F) Provider behavior assumptions and reconciliation (i) Assumptions In calculating amounts under subparagraph (B)(i), the Secretary shall make assumptions about provider behavioral change that could occur as a result of implementation of the home health groupings model such as for changes in the number of service units and changes in diagnosis codes billed. (ii) Description of assumptions The Secretary shall provide a description of the assumptions made under clause (i) in the notice and comment rulemaking used to implement this paragraph. (iii) Reconciliation Not later than 2025, and in subsequent years as appropriate, the Secretary shall determine the impact of differences between actual and assumed behavior on estimated aggregate expenditures under this subsection. (iv) Permanent adjustments The Secretary shall, at a time and in a manner determined appropriate, provide for one or more permanent increases or decreases to the standard prospective payment amounts for applicable years, on a prospective basis, to account for the determination under clause (iii). (v) Temporary adjustments for retrospective behavior The Secretary shall, at a time and in a manner determined appropriate, provide for one or more temporary increases or decreases to the standard prospective payment amounts for applicable years, on a prospective basis, to account for the determination under clause (iii) with respect to years before the adjustment in clause (iv). (vi) Other behavior The Secretary shall, at a time and in a