Ohio Revised Code Title XXXIX. Insurance § 3901.388

(A) A payment made by a third-party payer to a provider in accordance with sections 3901.381 to 3901.386 of the Revised Code shall be considered final two years after payment is made. After that date, the amount of the payment is not subject to adjustment, except in the case of fraud by the provider.

(B) A third-party payer may recover the amount of any part of a payment that the third-party payer determines to be an overpayment if the recovery process is initiated not later than two years after the payment was made to the provider. The third-party payer shall inform the provider of its determination of overpayment by providing notice in accordance with division (C) of this section. The third-party payer shall give the provider an opportunity to appeal the determination. If the provider fails to respond to the notice sooner than thirty days after the notice is made, elects not to appeal the determination, or appeals the determination but the appeal is not upheld, the third-party payer may initiate recovery of the overpayment.

When a provider has failed to make a timely response to the notice of the third-party payer's determination of overpayment, the third-party payer may recover the overpayment by deducting the amount of the overpayment from other payments the third-party payer owes the provider or by taking action pursuant to any other remedy available under the Revised Code. When a provider elects not to appeal a determination of overpayment or appeals the determination but the appeal is not upheld, the third-party payer shall permit a provider to repay the amount by making one or more direct payments to the third-party payer or by having the amount deducted from other payments the third-party payer owes the provider.

(C) The notice of overpayment a third-party payer is required to give a provider under division (B) of this section shall be made in writing and shall specify all of the following:

(D) Any provision of a contractual arrangement entered into between a third-party payer and a provider or beneficiary that is contrary to divisions (A) to (C) of this section is unenforceable.