Medicare Advantage Is Changing in 2027. Some Plans Could Close Before Open Enrollment Ends

Medicare beneficiaries shopping for 2027 coverage may encounter something unusual this fall: a Medicare Advantage plan can still appear attractive on paper but stop accepting new members after reaching an approved enrollment limit. That makes this year’s enrollment season different from the familiar routine of simply comparing premiums, doctors and drug coverage before the Dec. 7 deadline.

The broader Medicare Advantage market remains large. CMS expects roughly 5,532 Medicare Advantage plans to be available nationally in 2027, compared with 5,553 in 2026, while more than 99% of beneficiaries are expected to have access to at least one Medicare Advantage plan and 97% to at least 10 choices. But those national statistics can mask significant changes at the county and plan level, where some insurers are dropping products, narrowing provider networks or limiting how many people a particular plan will accept.

Enrollment Caps Could Make Timing More Important

CMS allows Medicare Advantage organizations to operate with approved enrollment capacity limits under specific circumstances. Once a plan with such a limit reaches capacity, it must stop accepting new applicants and remain closed until space becomes available through natural attrition. Valid applications received before the cap is reached must be processed in the order received, while applications arriving after the plan has reached capacity can be denied.

Existing members are not supposed to be removed simply because the plan reaches its enrollment ceiling. The cap primarily affects prospective members trying to join the plan after the limit has been reached. CMS’s 2027 guidance even added enrollment-capacity reasons to the model notice used when a Medicare Advantage enrollment request is denied.

These limits do not apply to every Medicare Advantage plan, and they should not be confused with the normal Dec. 7 end of Medicare Open Enrollment. The practical difference is that someone who waits until the final days of enrollment could discover that a particular capped plan is no longer accepting applications even though the overall enrollment period remains open.

This Does Not Mean Everyone Should Rush Into a Plan

The new capacity issue makes early comparison useful, but beneficiaries should not choose hastily simply out of fear that every plan will fill up. Most Medicare Advantage offerings are not subject to these limits, and CMS still projects broad access nationally. The better strategy is to begin reviewing options when 2027 plans become available, identify the plans that genuinely fit, and determine whether any preferred option has an enrollment capacity restriction.

That distinction matters because choosing the wrong plan quickly can be more expensive than choosing the right plan carefully. Doctor networks, prescription formularies, prior-authorization requirements, hospital access and maximum out-of-pocket limits can all matter more than whether an application is submitted on Oct. 16 instead of Nov. 16.

Beneficiaries considering a plan with a capacity limit should still avoid unnecessary delay once they have completed that comparison. CMS guidance requires capped plans to continue accepting valid applications until the approved capacity is actually reached, meaning availability can change during the enrollment season.

Some Insurers Are Pulling Back From Less-Profitable Markets

Enrollment limits are part of a larger shift underway in Medicare Advantage. After years in which insurers competed aggressively for membership, several major carriers are concentrating more heavily on profitability as medical utilization and health-care costs rise.

UnitedHealthcare and CVS Health’s Aetna, for example, have said they are moving toward more limited provider networks in portions of their 2027 Medicare Advantage business. Aetna is reducing its state footprint, while Humana is also cutting back county availability as insurers try to control costs and improve plan economics.

That does not mean Medicare Advantage is contracting everywhere. CMS projects enrollment of about 34 million people in 2027, representing approximately 47.4% of Medicare beneficiaries. The important change is that growth is becoming more selective, with insurers deciding more carefully which markets, provider networks and benefit packages they want to maintain.

A Plan Disappearing Is Different From a Plan Reaching Capacity

Beneficiaries also need to distinguish between a plan that is terminating and one that simply stops accepting new members. If an existing Medicare Advantage plan continues into 2027 and reaches its capacity limit, current members generally remain enrolled as long as they continue to meet the plan’s eligibility requirements.

A plan termination is different because the coverage itself will no longer be available in the new year. Nearly 3 million Medicare Advantage beneficiaries had to find different coverage for 2026 after insurers eliminated plans or withdrew from markets, according to research reported earlier this year. Rural beneficiaries were particularly likely to be affected by those disruptions.

Anyone receiving a notice that a current plan is ending should therefore treat it differently from an ordinary Annual Notice of Change. Those beneficiaries may receive additional Special Enrollment Period protections, but they still need to determine what coverage will replace the disappearing plan.

2027 Premiums May Look Better Than Expected

One potentially positive development is that average Medicare Advantage premiums are projected to fall in 2027. CMS estimates the weighted average monthly premium across Medicare Advantage plans will decline from $14.37 in 2026 to $12 in 2027, a drop of about 16.5%. About eight in 10 Medicare Advantage beneficiaries are expected to be able to remain in their current plan with the same or a lower premium.

That headline should not be interpreted to mean everyone’s total health-care cost is declining. A plan can reduce or maintain its premium while changing specialist copayments, hospital cost sharing, drug coverage, provider networks or maximum out-of-pocket limits.

The premium should therefore be treated as only one line of the comparison. A $0-premium plan with a shrinking hospital network or higher medical cost sharing may ultimately be more expensive than a plan charging a modest monthly premium.

Dental, Vision and Other Extra Benefits Aren’t Disappearing Nationwide

There has also been concern that insurers will broadly eliminate popular supplemental benefits such as dental, hearing and vision coverage. CMS currently projects that those benefits will remain generally stable across the Medicare Advantage market in 2027.

That national average does not guarantee that a particular plan will preserve the same allowance or benefit structure. A dental benefit can remain technically available while the annual maximum declines, the provider network changes or the covered procedures become more restrictive.

This makes the Annual Notice of Change particularly important. Beneficiaries should compare the actual 2027 benefit against what the plan offered in 2026 rather than relying on the fact that the plan still advertises dental or vision coverage.

Provider Networks May Be the Bigger Story

For many beneficiaries, network changes could matter more than premiums or supplemental benefits. Several insurers are shifting toward HMOs and other more tightly managed arrangements because broader PPO networks can be more expensive to operate.

A beneficiary who chooses Medicare Advantage primarily because a favorite cardiologist, cancer center or hospital participates should verify those relationships again for 2027. Provider participation can change, and a plan with an appealing premium is of little value if the providers someone expects to use are no longer accessible on favorable terms.

That verification should go beyond simply looking at an online directory. Calling the provider and confirming participation with the insurer can reduce the risk of discovering a network problem after coverage begins in January.

Part D Is Changing Too

Standalone Medicare Part D coverage is also entering 2027 with changes, although premiums nationally are projected to remain relatively stable. CMS expects the average monthly premium for standalone drug plans to rise from $35.09 in 2026 to about $36 in 2027.

Medicare Advantage plans that include prescription coverage are expected to move in the opposite direction, with the average Part D portion of the premium falling from $11.32 to about $7 after Medicare Advantage rebates are applied. Those averages still say little about what an individual beneficiary will pay for a specific set of medications.

Formularies, drug tiers, preferred pharmacies and utilization requirements can change annually. Someone taking several ongoing prescriptions should therefore enter the exact medications into Medicare’s comparison tools rather than selecting a drug plan based primarily on the monthly premium.

State and County Differences Matter More Than the National Numbers

A national count of more than 5,500 Medicare Advantage plans can make the market look extremely competitive, but no beneficiary has access to all of them. Plans are offered within specific counties and service areas, which means someone’s actual choices depend heavily on where they live.

Some states and counties are seeing insurers expand while others are experiencing reductions. That is why a national statistic showing relatively stable plan availability can coexist with a beneficiary opening an Annual Notice of Change and discovering that their own choices have shrunk significantly.

The same applies to enrollment caps. Capacity restrictions are attached to particular plans rather than Medicare Advantage as a whole, so the effect may be significant in one market and nonexistent in another.

What Beneficiaries Should Do Before Oct. 15

Medicare Open Enrollment runs from Oct. 15 through Dec. 7, 2026, for coverage beginning in 2027. CMS encourages beneficiaries to review their current plan and compare available health and drug options because costs and benefits can change from one year to the next.

Before enrollment begins, beneficiaries should review their Annual Notice of Change and make a current list of doctors, hospitals and prescription drugs. Once 2027 plans are available for comparison, those items can be checked against the new networks, formularies, premiums, deductibles and out-of-pocket limits.

If a preferred Medicare Advantage plan has an enrollment capacity limit, waiting until Dec. 7 could create an unnecessary risk. But the right response is not to enroll blindly on the first day; it is to begin the comparison early enough that there is time to make an informed decision before a capped plan potentially closes.

2027 Requires More Attention Than Simply Renewing

Most Medicare beneficiaries will still have substantial plan choice in 2027, and average premiums do not suggest a nationwide collapse in Medicare Advantage. But the market underneath those averages is changing as insurers reduce some footprints, narrow networks and manage enrollment more aggressively.

That makes automatic renewal riskier than it may appear. A plan can keep the same name while changing doctors, drugs, copayments or supplemental benefits, while another plan that appears attractive may eventually stop accepting new members because it has reached its approved capacity.

The most important Medicare strategy for 2027 is therefore not necessarily switching plans. It is reviewing coverage early enough to know whether staying or switching actually makes sense.

Open Enrollment still ends Dec. 7. For some Medicare Advantage plans, however, the practical decision window could close sooner.