This section applies to: insurers and nonprofit health service plans that provide coverage for prescription drugs and devices under health insurance policies or contracts that are issued or delivered in the State; and health maintenance organizations that provide coverage for prescription drugs and devices under contracts that are issued or delivered in the State. An insurer, nonprofit health service plan, or health maintenance organization that provides coverage for prescription drugs and devices through a pharmacy benefits manager is subject to the requirements of this section. An entity subject to this section may not impose a copayment or coinsurance requirement for a covered prescription drug or device that exceeds the retail price of the prescription drug or device.