The Employer Health Plan Flexibility Act would allow employer-sponsored health insurance plans governed by federal ERISA rules to opt out of providing the ten essential health benefits required under the Affordable Care Act, such as hospitalization, prescription drugs, and preventive care. The bill affects employers who offer group health plans and their employees, potentially allowing companies to design more limited and less costly insurance options. Employers using this exemption would be required to notify workers annually about which essential benefits are not covered and provide information about costs and coverage details. The bill preserves other federal protections including mental health parity requirements, nondiscrimination rules, and fiduciary duties, though it removes the specific mandate for comprehensive essential health benefits coverage. The changes would take effect for health plans beginning on or after January 1, 2028.