Washington Revised Code Title 48. Insurance § 48.41.210. Last payor of benefits

(1) Benefits otherwise payable under pool coverage shall be reduced by all amounts paid or payable through any other health insurance, or health benefit plans, including but not limited to self-insured plans and by all hospital and medical expense benefits paid or payable under any worker's compensation coverage, automobile medical payment or liability insurance whether provided on the basis of fault or nonfault, and by any hospital or medical benefits paid or payable under or provided pursuant to any state or federal law or program.

(2) The administrator or the pool shall have a cause of action against an eligible person for the recovery of the amount of benefits paid which are not for covered expenses. Benefits due from the pool may be reduced or refused as a set-off against any amount recoverable under this subsection.