42 CFR § 484.215 - Initial establishment of the calculation of the national, standardized prospective payment rates.
(a) Determining an HHA's costs. In calculating the initial unadjusted national 60-day episode payment applicable for a service furnished by an HHA using data on the most recent available audited cost reports, CMS determines each HHA's costs by summing its allowable costs for the period. CMS determines the national mean cost per visit.
(b) Determining HHA utilization. In calculating the initial unadjusted national 60-day episode payment, CMS determines the national mean utilization for each of the six disciplines using home health claims data.
(d) Calculation of the unadjusted national average prospective payment amount for the 60-day episode. For episodes beginning on or before December 31, 2019, CMS calculates the unadjusted national 60-day episode payment in the following manner:
(1) By computing the mean national cost per visit.
(2) By computing the national mean utilization for each discipline.
(3) By multiplying the mean national cost per visit by the national mean utilization summed in the aggregate for the six disciplines.
(4) By adding to the amount derived in paragraph (d)(3) of this section, amounts for nonroutine medical supplies, an OASIS adjustment for estimated ongoing reporting costs, an OASIS adjustment for the one time implementation costs associated with assessment scheduling form changes and amounts for Part B therapies that could have been unbundled to Part B prior to October 1, 2000. The resulting amount is the unadjusted national 60-day episode rate.
(e) Standardization of the data for variation in area wage levels and case-mix. CMS standardizes -
(1) The cost data described in paragraph (a) of this section to remove the effects of geographic variation in wage levels and variation in case-mix;
(2) The cost data for geographic variation in wage levels using the hospital wage index; and
(f) For periods beginning on or after January 1, 2020, a national, standardized prospective 30-day payment rate applies. The national, standardized prospective 30-day payment rate is an amount determined by the Secretary, as subsequently adjusted in accordance with § 484.225.