To the extent the federal government approves such payments under the state's plan for medical assistance, and only to the extent that funds are specifically appropriated for this purpose in the biennial appropriations act, the department shall make supplemental payments to nursing facilities operated by public hospital districts. The payments shall be calculated and distributed in accordance with the terms and conditions specified in the biennial appropriations act. The payments shall be supplemental to the component rate allocations calculated in accordance with Part E of chapter 74.46 RCW and the related sections of this chapter neither the provisions of Part E of chapter 74.46 RCW nor the settlement provisions of this chapter apply to these supplemental payments.