This section applies to: insurers and nonprofit health service plans that provide coverage for prescription drugs under individual, group, or blanket health insurance policies or contracts that are issued or delivered in the State; and health maintenance organizations that provide coverage for prescription drugs under individual or group contracts that are issued or delivered in the State. An insurer, a nonprofit health service plan, or a health maintenance organization that provides coverage for prescription drugs through a pharmacy benefits manager is subject to the requirements of this section. An entity subject to this section may not apply a prior authorization requirement for a prescription drug used as postexposure prophylaxis for the prevention of HIV if the prescription drug is prescribed for use in accordance with Centers for Disease Control and Prevention guidelines.