Ohio Revised Code Title XXXIX. Insurance § 3924.27

(A) As used in this section:

(B) No group health benefit plan, or carrier offering health insurance coverage in connection with a group health benefit plan, shall require any individual, as a condition of enrollment or continued enrollment under the plan, to pay a premium or contribution that is greater than the premium or contribution for a similarly situated individual enrolled in the plan on the basis of any health status-related factor in relation to the individual or to an individual enrolled under the plan as a dependent of the individual.

(C) Nothing in division (B) of this section shall be construed to restrict the amount that an employer may be charged for coverage under a group health benefit plan, or to prevent a group health benefit plan, and a carrier offering group health insurance coverage, from establishing premium discounts or rebates or modifying otherwise applicable copayments or deductibles in return for adherence to programs of health promotion and disease prevention.