Your Complete Guide to Medicare’s Annual Enrollment Period

Medicare’s Annual Enrollment Period (AEP) is just around the corner, running from October 15th through December 7th. This crucial window is your opportunity to review, compare, and change your Medicare coverage for the upcoming year. Whether you’re new to Medicare or a seasoned enrollee, being prepared can help you make the most informed decisions about your healthcare..

What is the Annual Enrollment Period?

The Annual Enrollment Period is a seven-week window when Medicare beneficiaries can make changes to their coverage. During this time, you can switch from Original Medicare to a Medicare Advantage plan, change from one Medicare Advantage plan to another, or modify your Part D prescription drug coverage.

Why AEP Matters

Your healthcare needs change over time, and so do Medicare plans. Insurance companies adjust their coverage, costs, and provider networks annually. What worked perfectly for you last year might not be the best option this year. That’s why reviewing your coverage during AEP is essential—even if you’re happy with your current plan.

Key Things to Review

Your Current Coverage Take stock of how well your current plan served you over the past year. Did it cover your medications adequately? Were your doctors in-network? Did you face any unexpected out-of-pocket costs?

Plan Changes for Next Year Insurance companies must notify you of changes to your plan by September 30th. Review these notices carefully. Premiums, deductibles, copays, and covered medications can all change.

Your Healthcare Needs Consider how your health and medication needs may have evolved. New diagnoses, different prescriptions, or changes in your preferred doctors all impact which plan works best for you.

Comparing Your Options

Medicare Advantage vs. Original Medicare Medicare Advantage plans bundle hospital (Part A), medical (Part B), and usually prescription drug (Part D) coverage into one plan. Original Medicare gives you more flexibility in choosing providers but typically requires separate Part D coverage and possibly a Medigap policy.

Prescription Drug Coverage Enter your medications into Medicare’s Plan Finder tool to compare how different plans cover your specific prescriptions. The cheapest premium doesn’t always mean the lowest total cost.

Provider Networks Confirm that your preferred doctors, specialists, and hospitals are in-network for any plan you’re considering. Out-of-network care can be significantly more expensive.

Enrollment Tips for Success

Start Early Don’t wait until the last minute. Give yourself time to research options, ask questions, and make a thoughtful decision.

Use Official Resources Medicare.gov’s Plan Finder tool is free and unbiased. You can also call 1-800-MEDICARE for personalized assistance.

Keep Documentation Handy Have your Medicare card, current plan information, medication list, and preferred provider information ready when comparing plans.

Consider Professional Help State Health Insurance Assistance Programs (SHIPs) offer free, unbiased counseling to help you navigate your options.

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Important Deadlines

  • October 15: AEP begins
  • December 7: AEP ends (your last day to make changes)
  • January 1: Your new coverage begins

Any changes you make during AEP take effect on January 1st of the following year.

Don’t Miss This Window

The Annual Enrollment Period only comes once a year. Missing it could mean you’re stuck with a plan that doesn’t meet your needs or costs more than necessary. Even if you love your current coverage, a quick review ensures you’re not missing out on better options.

Take control of your healthcare coverage this AEP. With the right preparation and these enrollment tips, you can navigate Medicare’s Annual Enrollment Period like a pro and start the new year with confidence in your coverage.


Remember: The decisions you make during the Annual Enrollment Period affect your healthcare for the entire upcoming year. Take the time to review, compare, and choose wisely.

This information is for educational purposes only and should not be considered personalized insurance advice. Always consult with qualified insurance professionals or Medicare directly for guidance specific to your situation.

Page Last Updated On: September 29, 2025
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Tida Garcia

Tida Garcia

Vice President of Contracting and Network Operations

Tida Garcia is Vice President of Network Operations for eternalHealth, where she oversees provider network operations including management of provider relationships and network performance. Tida brings extensive experience in provider claims, network adequacy strategy, and Medicare Advantage operations, along with deep expertise in delegated oversight.  She has led delegated oversight for large carriers including monitoring and performance management of delegated providers and entities, ensuring regulatory compliance operational integrity, and strong network performance.  Tida partners cross-functionally to support a scalable, high-quality care delivery model.   

Tom Lawless

Tom Lawless

Chief Financial Officer

Tom Lawless has spent the past 20+ years building, sustaining, and growing new healthcare-related programs that balance fiscal responsibility & prudence with creativity & innovation, focusing on models of care that are novel, person-centered, and improve the social welfare of those who are served. He is very excited to continue doing so in his role as the Chief Financial Officer of eternalHealth.

Tom comes to eternalHealth from a not-for-profit, member-centric, health insurance cooperative. He helped the company continuously strive toward its dual goals of thriving financially, while keeping members at the very epicenter of its mission and service model. While there, Tom also spearheaded the creation of a brand new private, charitable foundation, which will be meaningfully giving back to those in need in the surrounding communities for years to come. Previously, Tom worked in the finance department of a successful hospice that provided high-quality care to persons experiencing their unique and poignant end-of-life journeys, assuring that the appropriate financing was always available. Tom’s career began as a civil servant in the Wisconsin Medicaid program, where he helped to create a program that expanded the institutional entitlement to care into home and community-based settings. Starting with only a blueprint in hand, the program now serves more than 57,000 frail elders and disabled adults and is considered a national model. Growing into a senior leadership role, Tom was a key architect of an innovative financing model, through which the public and private sectors successfully collaborated to better the lives of persons in great need.

Tom holds undergraduate and graduate degrees from the University of Chicago, with additional graduate work in economics completed at the University Wisconsin-Madison.

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