(1) Each case mix classification group shall be assigned a case mix weight. The case mix weight for each resident of a nursing facility for each calendar quarter or six-month period during a calendar year shall be based on data from resident assessment instruments completed for the resident and weighted by the number of days the resident was in each case mix classification group. Days shall be counted as provided in this section.
(2) The case mix weights shall be based on finalized case mix weights as published by the centers for medicare and medicaid services in the federal register.