Ohio Revised Code Title XXXIX. Insurance § 3901.389

(A) Any third-party payer that fails to comply with section 3901.381 of the Revised Code, or any contractual payment arrangement entered into under section 3901.383 of the Revised Code, shall pay interest in accordance with this section.

(B) Interest shall be computed based upon the number of days that have elapsed between the date payment is due in accordance with section 3901.381 of the Revised Code or the contractual payment arrangement entered into under section 3901.383 of the Revised Code, and the date payment is made. The interest rate for determining the amount of interest due shall be equal to an annual percentage rate of eighteen per cent.

(C) For purposes of this section, if a dispute exists between a provider and a third-party payer as to the day a payment was made by the third-party payer, both of the following apply:

(D) Interest due in accordance with this section shall be paid directly to the provider at the time payment of the claim is made and shall not be used to reduce benefits or payments otherwise payable under a benefits contract.