End of Medicare Advantage Open Enrollment Period: Key Facts and Tips

Millions of Americans currently enrolled in Medicare Advantage plans are nearing the end of the Medicare Advantage Open Enrollment Period, which concludes on March 31. This period is crucial as it provides the final opportunity this year for beneficiaries to adjust their coverage to better suit their needs.

With over 34 million individuals participating in the Medicare Advantage program, analysts warn that approximately 3 million enrollees could face immediate financial liabilities. These liabilities might result from plan exits, cost increases, or reduced provider networks, posing significant challenges in accessing required healthcare services.

The open enrollment period allows current enrollees to switch plans within Medicare Advantage or revert to Original Medicare, potentially adding a standalone Part D prescription drug plan. Any changes made by the March 31 deadline become effective on April 1. Without action, most enrollees must wait until the Fall Open Enrollment Period beginning October 15 to make changes.

The Medicare Rights Center cautions that missing this deadline could leave beneficiaries in unsuitable plans, potentially escalating their medical costs throughout the year. To facilitate changes, enrollees can use Medicare’s online Plan Finder or contact 1-800-MEDICARE for support. Those leaving Medicare Advantage should consider Medigap policy availability and terms, which vary by state and may include higher premiums or medical underwriting requirements.

The State Health Insurance Assistance Programs (SHIPs) provide free, neutral counseling across all U.S. states, territories, and Puerto Rico, helping beneficiaries navigate their options. Missing the enrollment deadline could result in higher out-of-pocket costs and reduced plan choices, notably for those needing specialized care, ongoing treatments, or expensive prescriptions.

Insurer network changes might expose patients to out-of-network charges or necessitate provider changes. Individuals living on fixed incomes, initially attracted by low-premium plans, could find even minor fee increases burdensome. Additionally, many automatically re-enrolled in higher-cost plans face the March 31 deadline as their last chance to mitigate financial risks for the 2026 plan year.