Medicare Advantage Plans May Reach Enrollment Capacity in 2027: Why Waiting Until December Could Matter

For years, Medicare beneficiaries have been told the same thing about Medicare’s Annual Enrollment Period: you have until December 7 to make your decision.

That is still true. Medicare’s Annual Enrollment Period runs from October 15 through December 7, and changes made during this window generally take effect January 1. But for people considering certain Medicare Advantage plans for 2027, there’s an important reason why having until December 7 may not mean that every plan available earlier in the enrollment period will still be accepting new members on December 7.

Beginning with 2027 Medicare Advantage plan offerings, enrollment capacity limits deserve much more attention. This is not something Medicare beneficiaries need to panic about. It’s something they need to understand.

At Mere Benefits, we have always encouraged our existing Medicare clients to review their coverage early, and when a plan change is appropriate, we try to complete those changes during October whenever possible. The new Medicare Advantage enrollment capacity guidance gives us another reason why getting an early start may matter.

Can a Medicare Advantage plan stop accepting new members?

Yes.

Medicare Advantage organizations can establish an enrollment capacity limit for individual plans as part of the annual bid process with the Centers for Medicare & Medicaid Services (CMS). Federal regulations already require Medicare Advantage organizations to include the projected number of enrollees and the plan’s enrollment capacity, if any, in their bid information.

For 2027, CMS provided additional guidance explaining how these capacity limits work. An insurance company offering Medicare Advantage may submit an enrollment capacity limit for one or more plans during bid submission. If CMS accepts that limit, the plan must accept valid enrollment requests in the order they are received until the capacity is reached. Once the plan reaches that limit, it closes to prospective new enrollees until capacity becomes available again.

That means a Medicare Advantage plan that is available when you review your options in October could potentially stop accepting new enrollments before December 7 if it reaches its approved enrollment capacity.

Does this mean Medicare Advantage plans will definitely fill up in 2027?

No — and that distinction is extremely important.

We do not yet know how many Medicare Advantage plans will have capacity limits for 2027, how high those limits will be, or whether any particular plan will actually reach its limit during AEP. Carriers are not required to establish enrollment capacity limits; CMS specifically describes submitting one as optional.

So this is not a reason to assume Medicare Advantage plans everywhere are going to “sell out.” It is, however, a reason to reconsider the idea that there’s never any difference between enrolling on October 15 and enrolling on December 7. For a plan with an approved capacity limit, timing potentially can matter.

What happens when a plan reaches its enrollment limit?

CMS’s 2027 enrollment guidance is very specific. A Medicare Advantage plan with an established capacity limit must accept valid applications in the order they are received until its limit is reached. Once capacity has been reached, the plan must remain closed to prospective new enrollees until space becomes available. Enrollment requests received after the limit has already been reached must be denied based on capacity.

Importantly, if a plan discovers while processing applications that it reached capacity, applications received before the limit was reached continue to be processed. The carrier cannot retroactively reject earlier applications because it later discovered the plan was full.

In other words, the date and time an enrollment request is received can matter. That’s one of the biggest reasons Medicare beneficiaries should understand this change.

This is different from a plan being “non-commissionable”

There’s another distinction worth understanding. You may hear that a Medicare Advantage plan is “non-commissionable.” That generally relates to whether an insurance agent or broker is compensated for an enrollment — it does not, by itself, mean consumers cannot enroll in the plan.

An enrollment capacity limit is different. Once a plan actually reaches its established capacity, the issue isn’t whether an agent can submit the enrollment or whether the agent gets paid. The plan itself is closed to new enrollment because it has reached capacity.

At Mere Benefits, our job is to help clients evaluate coverage based on their healthcare needs — not simply based on whether a particular plan pays an agent a commission.

Why would an insurance company limit Medicare Advantage enrollment?

Capacity limits can serve several purposes. A Medicare Advantage organization has to manage much more than premiums: it maintains provider networks, administers benefits, manages utilization, provides member services, processes claims, and needs the infrastructure to actually serve its membership.

For 2027, CMS allows Medicare Advantage organizations to propose a capacity limit during the bid process and provide supporting information explaining the basis for that limit.

There’s also an important distinction between establishing the limit during the annual bid process and trying to restrict enrollment later. If an organization did not establish a capacity limit through its bid, CMS says it generally cannot later restrict enrollment for capacity reasons unless it requests and receives approval through a separate process. For that later request, CMS applies a much higher standard and considers it only when beneficiary health and safety are at risk.

That is a meaningful change in how consumers should think about Medicare Advantage capacity.

Could a plan already be full when AEP begins?

Potentially, yes. CMS addressed this possibility directly in its 2027 bid guidance, explaining that a plan’s enrollment could reach or exceed its 2027 capacity limit even before the Annual Enrollment Period begins. If that occurs, the plan may not be able to accept AEP enrollments for January 1, 2027 coverage.

If the plan remains below its capacity limit when AEP begins, it must continue accepting valid enrollment requests in the order received until the limit is reached.

Again — this does not mean it will happen to every Medicare Advantage plan. But it demonstrates why beneficiaries shouldn’t assume every plan they hear about will remain available throughout the entire enrollment season.

The 2027 enrollment calendar hasn’t changed

Nothing about enrollment capacity changes the dates of Medicare’s Annual Enrollment Period. For 2027 coverage:

The difference is that December 7 represents the deadline for making an AEP election. It does not guarantee that every Medicare Advantage plan available earlier in AEP will remain open for enrollment through December 7.

Why we try to complete our clients’ plan changes in October

Every year we encourage our existing Medicare clients to get their annual reviews completed early, and there are practical reasons for that. A real review takes time, because we need to look at:

• Changes to your current plan for the coming year
• Your doctors and healthcare providers
• Your prescription medications
• Pharmacy preferences
• Premiums and copays
• Maximum out-of-pocket exposure
• Provider networks
• Prescription drug formularies
• Prior authorization requirements
• Supplemental benefits
• Your individual healthcare needs

We don’t believe Medicare decisions should be rushed. But there’s a big difference between taking the time necessary to make an informed decision and procrastinating after you already know which coverage you want.

If your review shows that your existing coverage continues to meet your needs, you may not need to make a change at all. If a change is appropriate, our goal is generally to complete it during October rather than waiting until late November or the first week of December. Enrollment capacity limits give us one more reason for that approach.

Don’t choose a plan because you’re afraid it might fill up

This may be the most important part of this entire discussion. Do not let the possibility of an enrollment capacity limit pressure you into choosing a Medicare Advantage plan before you understand it.

A plan isn’t right for you simply because it has attractive extra benefits, a low premium, or an advertisement that caught your attention. Your doctors need to be considered. Your prescriptions need to be checked. Your hospitals and preferred healthcare systems matter. Your expected healthcare utilization matters. Your financial exposure matters. And the type of Medicare coverage you choose can have consequences beyond the upcoming calendar year.

The goal isn’t to make the fastest decision. The goal is to start early enough that you can make a good decision without having to make a rushed one.

What should you do before October 15?

Start preparing before enrollment opens.

Your current Medicare plan should provide information explaining how your coverage is changing for the next year. Review those changes carefully rather than assuming that because your plan worked well in 2026, it will work exactly the same way in 2027.

Beginning October 1, compare your existing coverage with the Medicare options available for 2027. Then ask questions.

If you work with Mere Benefits, complete the annual review information we request as early as possible. That allows our team to research your specific situation and determine whether your current plan still makes sense. If a change is recommended, we can discuss why. If keeping your current coverage makes sense, we’ll tell you that too.

What if you wait until December 7?

December 7 remains the final day of Medicare’s Annual Enrollment Period. But waiting until the final days creates problems even without enrollment capacity limits. You have less time to verify doctors. Less time to research prescriptions. Less time to ask questions. Less time to correct missing or inaccurate information. Less time to compare your options carefully.

And now, depending on the Medicare Advantage plans available in your area, there’s another potential consideration: a plan with an enrollment capacity limit could reach that limit before you make your decision.

That’s why we would rather spend October helping our clients make thoughtful decisions than spend December 7 trying to make hurried ones.

Frequently asked questions about Medicare Advantage enrollment caps

Can a Medicare Advantage plan have an enrollment limit? Yes. Medicare Advantage organizations may establish an enrollment capacity limit for a plan through the CMS bid process.

Can a Medicare Advantage plan fill up during Medicare Open Enrollment? Potentially. If a plan has an approved capacity limit and enrollment reaches that limit, CMS guidance requires the plan to stop accepting new enrollment requests based on capacity.

Are all Medicare Advantage plans going to have enrollment caps in 2027? No. Capacity limits are optional, and we don’t know that every carrier or every plan will use them.

Are Part D prescription drug plans subject to these same bid-based capacity limits? No. CMS’s 2027 Part C bid guidance specifically states that Part D sponsors do not have the option to submit an enrollment capacity limit through this process.

If a plan reaches capacity, can I still enroll directly through the insurance company? A capacity closure applies to the plan’s prospective enrollment, not simply to one sales channel. It is not the same thing as a carrier deciding not to pay commissions to agents.

What happens to people already enrolled in a plan that reaches its capacity limit? Reaching the limit does not give the insurance company permission to remove existing members to get back under the cap. CMS specifically states that plans may not involuntarily disenroll existing beneficiaries simply because enrollment exceeds a capacity limit.

What happens if I submit an application and the plan reaches capacity? The timing of your application matters. CMS requires a plan with an established capacity limit to accept valid enrollment requests in the order they are received until the limit is reached. If the carrier is processing applications and discovers the plan has reached its limit, applications received before capacity was reached must continue to be processed — the carrier cannot reject those earlier applications because it later discovered the plan was full. However, enrollment requests received after the plan has already reached capacity must be denied based on capacity. This is why the date and time your enrollment request is received can become extremely important.

How will I know if my enrollment was denied because the plan reached capacity? You should receive written notification from the Medicare Advantage organization. Under CMS’s enrollment guidance, when an enrollment request is denied because of a capacity limitation, the organization must notify the individual in writing, and CMS guidance says that notice should come within 10 calendar days after the enrollment request is received. This is another reason we encourage clients not to wait until the final days of AEP: if you submit in October and there’s a problem, there may still be plenty of time to review another option. If you submit on December 7, you may not learn the enrollment was unsuccessful until after AEP has already ended.

What if my enrollment is denied for capacity and Annual Enrollment has already ended? This is where waiting until the end of AEP could become particularly costly. A capacity denial does not automatically mean Medicare gives everyone another opportunity to choose any plan they want after December 7. Your options depend on your circumstances. You may qualify for a Special Enrollment Period because of another situation — moving, losing certain coverage, qualifying for Medicaid or Extra Help, or another qualifying event. If you’re already enrolled in a Medicare Advantage plan, you may also have options during the Medicare Advantage Open Enrollment Period from January 1 through March 31, when people already in Medicare Advantage generally get one opportunity to switch plans or return to Original Medicare. But MA Open Enrollment is not the same as AEP and isn’t available to everyone — someone in Original Medicare generally cannot use it simply to join a Medicare Advantage plan. So there could be situations where someone waits until the end of AEP, learns after December 7 that the plan had reached capacity, and discovers their choices are now more limited than they would have been earlier.

If my application is denied because the plan is full, will I lose my existing coverage? Generally, submitting an enrollment request for a new Medicare Advantage plan does not by itself cancel your existing Medicare coverage before the new enrollment becomes effective. What happens next depends on the coverage you already have and the circumstances of the unsuccessful enrollment. Don’t assume a rejected application means you’re uninsured — but don’t assume the coverage you intended to have on January 1 is in place, either. If you receive a denial or any notice indicating an enrollment could not be completed, contact your agent, the plan, or Medicare promptly so your actual enrollment status can be verified. Mere Benefits clients should contact our office as soon as a notice like this arrives so we can determine what happened and what options remain.

Can Mere Benefits guarantee a plan will still be available if I wait? No — and neither can another agent, the insurance company, or Medicare guarantee that a plan with an established capacity limit will remain open throughout AEP. We also don’t want beneficiaries enrolling hastily out of fear. Our recommendation is simpler: start early, review carefully, make an informed decision, and once you know which coverage is right for you, don’t procrastinate unnecessarily.

Should I enroll on October 15 just to make sure I get a plan? Not necessarily. First determine which Medicare coverage actually fits your needs. The better strategy is to begin your review early, so that once you have enough information to decide, you don’t have to wait for no reason.

The bottom line: start early, understand your options, then act

Medicare Annual Enrollment isn’t a race. But it also shouldn’t be treated like a college paper you can safely put off until the night before it’s due.

For 2027, Medicare Advantage enrollment capacity limits add another reason to start reviewing your coverage early. You still deserve the time to compare your options. You still deserve to understand the differences. You still deserve to ask questions. And you should never be pressured into enrolling in a Medicare plan simply because someone tells you to “act now.”

But once you’ve carefully reviewed your options and determined that a particular Medicare Advantage plan is the right fit, there may be very little benefit in waiting until December simply because the enrollment period technically allows it.

That’s one of the reasons we work hard to help our existing Medicare clients complete necessary plan changes during October whenever possible. It gives us time. It gives our clients time. It gives us an opportunity to address questions or problems before January. And for 2027, it could also matter if the plan that best fits your needs happens to carry an enrollment capacity limit.

Need help reviewing your Medicare coverage for 2027?

Mere Benefits helps Medicare beneficiaries understand their coverage, compare their options, and make informed decisions based on their doctors, prescriptions, healthcare needs, and financial priorities. Our goal isn’t simply to enroll you in a Medicare plan — it’s to help you understand why your coverage makes sense for you.

If you’re already a Mere Benefits client, watch for our instructions regarding your 2027 annual Medicare review and complete the requested information as early as possible.

If you’re looking for Medicare guidance, contact Mere Benefits or call 904-654-5450 to learn how we can help you review your options. Kate Spilsbury (RSSA®, CMIP®) is an independent, licensed agent based in Jacksonville, serving Northeast Florida and Camden County, GA. If your current plan is one of the Humana Medicare Advantage plans not being renewed for 2027, starting early matters even more.

Health Wealth Simplified LLC dba Mere Benefits is an independent insurance agency. We do not offer every plan available in every area. Currently we represent multiple organizations which offer products in the areas we serve. Please contact Medicare.gov, 1-800-MEDICARE, or your State Health Insurance Assistance Program (SHIP) for information on all of your options. Plan availability, benefits, premiums, provider networks and formularies vary by plan and service area. This article is educational and not medical, tax, or legal advice.