What Should You Do on the First Day of Medicare AEP?

On Oct 15, the first day of Medicare AEP, compare the plan options you saved during your pre-enrollment research, confirm that your doctors and prescription drugs remain in-network and on formulary, and enroll when you are ready. Your latest enrollment choice submitted before Dec 7 takes effect Jan 1.

Do you have to enroll on the first day?

No, you do not have to enroll on Oct 15. AEP runs through Dec 7, giving you nearly eight weeks to review and submit an application. Enrolling early simply locks in your choice sooner and can give you peace of mind, but your final decision is the one that counts.

Many beneficiaries spend the first week double-checking plan details and premiums before committing. Others wait for updated star ratings or compare plans side-by-side with an agent. As long as you complete enrollment by midnight Dec 7 in your time zone, coverage begins Jan 1.

Which choice counts if you change plans twice?

If you enroll in one plan on Oct 15 and then switch to a different plan on Nov 10, the Nov 10 choice is what takes effect Jan 1. CMS honors the last enrollment received before the Dec 7 deadline, automatically canceling any prior submission from the same AEP window.

This rule gives you flexibility to adjust if you discover a better premium, network change, or formulary update. Just keep track of confirmation numbers and submit your final choice well before Dec 7 to avoid technical delays.

When does new coverage start?

Any plan you enroll in during AEP (Oct 15–Dec 7) starts Jan 1 of the following year. This effective date applies whether you enroll on the first day or the last day of the window.

Your current coverage continues uninterrupted through Dec 31, so you will not experience a gap. If you do not submit an enrollment by Dec 7, you remain in your existing plan for another year unless a Special Enrollment Period applies.

What plan details should you confirm on Oct 15?

Before you enroll, verify that your primary care doctor, specialists, and preferred pharmacy are still in-network for the plan you selected. Check that each of your prescription drugs remains on the formulary at the tier and cost-share you expect.

Confirm the monthly premium, deductible, maximum out-of-pocket, and any extra benefits such as dental, vision, hearing, or over-the-counter allowances. If the plan changed star ratings or added a supplemental benefit since you last reviewed it, note those updates. Cross-reference the plan's Annual Notice of Change if you are switching from a current plan, and compare it to the Summary of Benefits for any new option.

How Affordable Medicare Quote handles this

Affordable Medicare Quote delivers exclusive live transfers and call back leads to licensed agents who help beneficiaries compare plans and enroll during AEP. Every lead is matched to the agent's licensed states and capacity, so you speak with prospects ready to make a first-day or same-week decision. Leads include phone number, contact preferences, and enrollment window timing to help you prioritize outreach and close enrollments before Dec 7.

Frequently asked questions

Can you enroll in a Medicare Supplement plan on Oct 15?

Yes, you can apply for a Medicare Supplement (Medigap) policy during AEP, but most states do not guarantee issue outside your Medigap Open Enrollment Period. Insurers may require medical underwriting, and premiums depend on your health and age.

What if the plan you want is not available on Oct 15?

If a plan does not appear in the Medicare Plan Finder or your agent's enrollment system, it may not be offered in your county for the upcoming year. Check with a licensed agent or call the carrier directly to confirm availability.

Do you need to re-enroll if you are keeping the same plan?

No. If you take no action during AEP, you automatically remain in your current Medicare Advantage or Part D plan for another year, subject to any changes outlined in your Annual Notice of Change.

Can you cancel an enrollment submitted on Oct 15?

Yes. You can cancel or change your enrollment any time before Dec 7 by submitting a new application for a different plan. The last enrollment CMS receives is the one that takes effect Jan 1.

Is there a penalty for enrolling late in AEP?

No, as long as you complete enrollment by Dec 7. Waiting until late November or early December does not trigger a penalty, but it leaves less time to fix application errors or address missing documentation.

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