(1) To determine reported costs, nursing facility contractors shall use generally accepted accounting principles, the provisions of this chapter, and chapter 74.46 RCW. In the event of conflict, chapter 74.46 RCW, this chapter, and instructions issued by the department take precedence over generally accepted accounting principles.

(2) A nursing facility's records shall be maintained on the accrual method of accounting and agree with or be reconcilable to the cost report. All revenue and expense accruals shall be reversed against the appropriate accounts unless they are received or paid, respectively, within one hundred twenty days after the accrual is made. However, if the contractor can document a good faith billing dispute with the supplier or vendor, the period may be extended, but only for those portions of billings subject to good faith dispute. Accruals for vacation, holiday, sick pay, payroll, and real estate taxes may be carried for longer periods, provided the contractor follows generally accepted accounting principles and pays this type of accrual when due.