(1) A final settlement must be by cost center and must fully substantiate all:

(a) Disallowed costs;

(b) Refunds;

(c) Underpayments; or

(d) Adjustments to cost reports, financial statements, other reports, and schedules submitted by the provider.

(2) A final settlement report must use the prospective rate at which the provider was paid during the report period, including any resident specific payment adjustments made for resident care and training cost center. Resident specific payments must be weighted by the number of paid resident days reported for the period each rate was in effect. DSHS must compare these payments to the provider's audited allowable costs for the period.

(3) A provider's administration operations and property cost center settlement rate is the prospective rate for the period weighted by the number of paid resident days each rate was in effect.

(4) A provider's return of equity rate is the prospective rate for the report period weighted by the number of paid resident days the rate was in effect.