N.Y. Comp. Codes R. & Regs. tit. 10, § 86-2.11
(b) Facilities shall report to the department changes in patient case mix as follows:
(d) Adjusted payment rates shall be determined by recalculating a facility's number of patients in each patient classification group as a result of the submissions in accordance with this section and such results shall be used in the calculation of the facility specific direct adjusted payment price per day pursuant to section 86-2.10(c)(4) of this Subpart.
(e) Trending.
Payment rates for the operating component of the rate as defined in section 86-2.10(b)(2) of this Subpart may be adjusted for changes in the trend factors originally promulgated by the department in accordance with section 86-2.12 of this Subpart.