Ohio Revised Code Title XXXIX. Insurance § 3959.20

(1) “Cost-sharing” means the cost to an individual insured under a health benefit plan according to any coverage limit, copayment, coinsurance, deductible, or other out-of-pocket expense requirements imposed by the plan.

(2) “Health benefit plan” and “health plan issuer” have the same meanings as in section 3922.01 of the Revised Code.

(3) “Pharmacy audit” has the same meaning as in section 3901.81 of the Revised Code.

(4) “Pharmacy benefit manager” and “administrator” have the same meanings as in section 3959.01 of the Revised Code.

(1) The amount an individual would pay for the drug if the drug were to be purchased without coverage under a health benefit plan;

(2) The net reimbursement paid to the pharmacy for the prescription drug by the health plan issuer, pharmacy benefit manager, or administrator.

(C)(1) No health plan issuer, pharmacy benefit manager, or administrator shall retroactively adjust a pharmacy claim for reimbursement for a prescription drug unless the adjustment is the result of either of the following:

(2) No health plan issuer, pharmacy benefit manager, or administrator shall charge a fee related to a claim unless the amount of the fee can be determined at the time of claim adjudication.