42 C.F.R. § 413.320

Publication of prospectively determined payment rates or amounts.

            At least 90 days before the beginning of a Federal fiscal year to which revised prospectively determined payment rates are to be applied, CMS publishes a notice in the
            Federal Register:

        (a) Establishing the prospectively determined payment rates for routine services; and

        (b) Explaining the basis on which the prospectively determined payment rates are calculated.

Official source