Section 743B.453 - Underpayment of claims(1) Except in the case of fraud and except as provided in subsection (3) of this section, a health care provider may not:(a) Request additional payment from a health insurer to satisfy a claim unless the provider:(A) Requests the additional payment in writing on or before the last day of the period specified by the contract or 18 months after the date the claim was denied or payment intended to satisfy the claim was made, whichever is earlier; and(B) Specifies in the written request why the provider believes the health insurer owes the additional payment.(b) Request that an additional payment be paid earlier than six months after the health insurer receives the request.(2) A health insurer may not consider a health care provider's claim untimely if the claim is made no later than 12 months after a different insurer: (a) Denied the claim in whole or in part; or(b) Requested a refund of an erroneous payment made on the claim.(3) A health care provider may not do the following for reasons related to coordination of benefits with another health insurer or entity responsible for payment of a claim: (a) Request additional payment from a health insurer to satisfy a claim unless the provider: (A) Requests the additional payment in writing within 30 months after the date the claim was denied or payment intended to satisfy the claim was made;(B) Specifies in the written request why the provider believes the health insurer owes the additional payment; and(C) Includes in the written request the name and mailing address of the other health insurer or entity that has disclaimed responsibility for payment of the claim.(b) Request that the additional payment be paid earlier than six months after the health insurer receives the request.(4) If a contract between a health insurer and a health care provider conflicts with this section, the provisions of this section prevail. However, nothing in this section prohibits a health insurer from choosing at any time to make additional payments to a health care provider to satisfy a claim.(5) This section applies to health benefit plans.743B.453 was added to and made a part of the Insurance Code by legislative action but was not added to ORS chapter 743B or any series therein. See Preface to Oregon Revised Statutes for further explanation.