Signing up for a Medicare Advantage (MA) plan during the Annual Enrollment Period (AEP) in the fall is just the first step. Once January rolls around, some beneficiaries realize that their plan isn’t quite the right fit. Maybe the copays are higher than expected, the network doesn’t include their preferred doctors, or their prescriptions aren’t fully covered.
Fortunately, there’s a second chance: the Medicare Advantage Open Enrollment Period (OEP). This period gives people already enrolled in a Medicare Advantage plan the opportunity to make a change early in the year. Understanding how the OEP works — what you can and can’t do, and how to evaluate your options — can save you money and ensure you get the coverage you need.
What Is the Medicare Advantage Open Enrollment Period?
The Medicare Advantage Open Enrollment Period runs from January 1 through March 31 each year. It’s sometimes confused with the Annual Enrollment Period, but the OEP has a very specific purpose: it allows beneficiaries already enrolled in a Medicare Advantage plan to make certain changes to their coverage.
Unlike the AEP, which is open to anyone eligible for Medicare, the OEP is only for people who already have a Medicare Advantage plan. It’s essentially a “correction window” for those who may have realized after December that their plan isn’t working as well as they hoped.
What Changes Can You Make During the OEP?
During the OEP, you have a limited set of options. You can:
- Switch from one Medicare Advantage plan to another: If your current plan doesn’t meet your needs, you can enroll in a different Medicare Advantage plan that may better match your doctors, prescription drugs, or budget.
- Drop your Medicare Advantage plan and return to Original Medicare: If you prefer the flexibility of Original Medicare and want the option to add a standalone Part D prescription drug plan, this is your opportunity.
- Enroll in a standalone Medicare Part D drug plan: This only applies if you switch back to Original Medicare. Adding Part D ensures your prescriptions remain covered.
It’s important to note that you can only make one change during this period. Once you enroll in a new plan or return to Original Medicare, that’s your choice until the next enrollment window unless you qualify for a Special Enrollment Period. Your new coverage begins the first day of the month after your enrollment request is processed.
What You Can’t Do During the OEP
The OEP does have limits. You cannot:
- Enroll in a Medicare Advantage plan if you currently have Original Medicare. That option is only available during the Annual Enrollment Period.
- Join a standalone Part D plan unless you are returning to Original Medicare.
Understanding these limits is essential to avoid confusion. If you’re considering changes outside these rules, you may need to explore a Special Enrollment Period (SEP) instead.
Why You Might Want to Make a Change
There are several reasons beneficiaries use the OEP. Some of the most common include:
- Unexpected out-of-pocket costs: Sometimes copays, coinsurance, or premiums turn out to be higher than anticipated. Switching plans can reduce your monthly expenses.
- Provider network issues: If your doctors, specialists, or preferred hospitals aren’t included in your current plan, you might need a new network.
- Prescription drug coverage gaps: Formularies change, and your medications may not be covered as expected. Switching plans can improve your coverage.
- Better plan options: Some people discover that a different plan offers more benefits, lower costs, or improved service after reviewing options post-AEP.
In short, the OEP gives you a chance to correct course without waiting for the next fall enrollment season. It’s your opportunity to make sure your coverage aligns with your healthcare needs.
How to Compare Medicare Advantage Plans Effectively
Switching plans during OEP is only beneficial if you choose a plan that actually meets your needs. Here are a few key factors to consider:
- Provider networks: Confirm that your doctors and preferred hospitals are in-network. Going out-of-network can result in higher costs or denied services.
- Prescription coverage: Review the plan’s drug formulary to ensure all your medications are covered at an affordable cost.
- Out-of-pocket limits: Compare the maximum you could pay annually for medical care under different plans. Lower limits may offer peace of mind.
- Extra benefits: While perks like dental, vision, hearing, or gym memberships are nice, prioritize core healthcare coverage first.
Working with a licensed Medicare agent can simplify this process. Agents can help you compare plans side by side, highlight differences, and recommend options that fit your needs and budget.

The Importance of Acting Early
The Medicare Advantage Open Enrollment Period ends March 31, and changes submitted late in the period still take effect the first day of the following month. Waiting too long can reduce the number of plan options available or delay the start of your coverage.
Starting your review early in January gives you time to understand your options, evaluate coverage, and make an informed decision. It also reduces stress and ensures that your healthcare needs are fully covered without interruption.
Enroll in Medicare Advantage with Carolina Senior Benefits
Navigating Medicare Advantage options can feel overwhelming, especially if you’re trying to understand networks, copays, and formularies all at once. That’s where we come in!
Our licensed agents help clients like you review your current Medicare Advantage plan, identify any coverage gaps, compare alternative plans, and guide you through switching your plan if needed.
We take a personalized, no-pressure approach. Our goal is to ensure that your coverage fits your unique needs and budget, giving you confidence that your healthcare is fully protected.
