Amends the Accident and Health Article of the Illinois Insurance Code. Provides that if a generic drug is unavailable due to a supply issue and dosage cannot be adjusted, a group or individual policy of accident and health insurance or a managed care plan that is amended, delivered, issued, or renewed after January 1, 2025 shall provide coverage for a brand name eligible prescription drug until supply of the generic drug is available. Defines "eligible prescription drug" and "generic drug". Makes conforming changes in the Health Maintenance Organization Act, the Limited Health Service Organization Act, the Voluntary Health Services Plans Act, and the Medical Assistance Article of the Illinois Public Aid Code.