RCW 48.43.600 (1-3)
(1) Except in the case of fraud, or as provided in subsections (2) and (3) of this section, a carrier may not: (a) Request a refund from a health care provider of a payment previously made to satisfy a claim unless it does so in writing to the provider within twenty-four months after the date that the payment was made; or (b) request that a contested refund be paid any sooner than six months after receipt of the request. Any such request must specify why the carrier believes the provider owes the refund. If a provider fails to contest the request in writing to the carrier within thirty days of its receipt, the request is deemed accepted and the refund must be paid.
(2) A carrier may not, if doing so for reasons related to coordination of benefits with another carrier or entity responsible for payment of a claim: (a) Request a refund from a health care provider of a payment previously made to satisfy a claim unless it does so in writing to the provider within thirty months after the date that the payment was made; or (b) request that a contested refund be paid any sooner than six months after receipt of the request. Any such request must specify why the carrier believes the provider owes the refund, and include the name and mailing address of the entity that has primary responsibility for payment of the claim. If a provider fails to contest the request in writing to the carrier within thirty days of its receipt, the request is deemed accepted and the refund must be paid.
(3) A carrier may at any time request a refund from a health care provider of a payment previously made to satisfy a claim if: (a) A third party, including a government entity, is found responsible for satisfaction of the claim as a consequence of liability imposed by law, such as tort liability; and (b) the carrier is unable to recover directly from the third party because the third party has either already paid or will pay the provider for the health services covered by the claim
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