More than 4 million Medicare beneficiaries could need to choose new coverage for 2027 after their current Medicare Advantage or stand-alone Part D plan ends on December 31, 2026. The change does not mean Medicare benefits are ending, but it can require affected members to review replacement options, confirm prescription coverage, and understand how their doctors and costs may change. KFF reported on October 27, 2026 that CMS data identifies 4.3 million beneficiaries in plans scheduled to terminate at year-end.

Medicare Advantage, also called Medicare Part C, is private-plan coverage that delivers Medicare benefits and often includes prescription drug coverage. A stand-alone prescription drug plan, or PDP, is private Part D drug coverage commonly paired with Original Medicare and, in many cases, a Medicare Supplement plan.

According to KFF’s analysis of Centers for Medicare & Medicaid Services data, 4.3 million Medicare beneficiaries are enrolled in Medicare Advantage drug plans or stand-alone Part D plans that will terminate at the end of 2026. KFF says that total includes 3.1 million Medicare Advantage drug plan enrollees and 1.2 million PDP enrollees.

The reported figure is large enough that beneficiaries should treat plan communications for 2027 as essential reading. A plan termination is different from a routine change in copays, provider networks, or drug formularies. When a plan will no longer be offered, members need to understand what coverage, if any, may be selected or assigned and whether it remains a good fit for their own health care needs.

Plan terminations and consolidations are different changes

KFF also reports that another 1.4 million Medicare Advantage enrollees are in plans consolidating with another plan offered by the same insurer. A consolidation generally means the insurer is combining coverage into another of its plans, while a termination means the existing plan is ending.

That distinction matters because a member should not assume that a new or consolidated plan will match the old one. The insurer may still offer a replacement path, but the new plan can have a different provider network, service area, premium, deductible, drug list, pharmacy network, dental allowance, or maximum out-of-pocket amount. Those details can shape both access to care and annual spending.

CMS is the federal agency that administers Medicare and oversees Medicare Advantage and Part D plan offerings. The supplied KFF summary identifies CMS data as the basis for these enrollment figures, but it does not identify the specific insurers, counties, plan names, or reasons for each termination or consolidation. Beneficiaries should therefore rely on their own plan notice and the official plan materials for details about their individual coverage.

Key Takeaway

If your Medicare Advantage or Part D plan ends on December 31, 2026, do not judge a replacement plan by its name or insurer alone. Compare its 2027 doctors, hospitals, prescription coverage, pharmacies, premiums, deductibles, and out-of-pocket limits before making an enrollment decision.

What affected Medicare members should review for 2027

For beneficiaries, the immediate issue is continuity. A plan that worked in 2026 may no longer be available in 2027, and a similar-looking alternative may not cover the same medications or providers. This is especially important for people who see specialists, take several prescriptions, use preferred pharmacies, travel often, or expect procedures in the coming year.

Start by checking whether you received a plan discontinuation or consolidation notice. Read it alongside your Annual Notice of Change and any 2027 evidence-of-coverage materials. These documents can explain whether your current plan is ending, whether the insurer is offering another plan, and what enrollment choices may be available. Keep the notice with your Medicare records in case you need help understanding your options.

Next, make a short comparison list based on your real care needs. Confirm that your physicians and preferred hospitals participate in a Medicare Advantage plan’s 2027 network, rather than assuming participation will carry over. Review each prescription by drug name, dosage, and pharmacy. For Part D coverage, look at the formulary, which is the plan’s covered-drug list, as well as tier placement, utilization rules, deductible, and pharmacy pricing. A lower monthly premium can be outweighed by higher drug costs or a network that does not include the providers you use.

People with Original Medicare should also review how a Part D change interacts with their Medicare Supplement coverage. A Medicare Supplement policy, often called Medigap, helps pay certain Original Medicare cost sharing but does not include Part D prescription coverage. If a stand-alone PDP is terminating, the prescription plan decision should be evaluated separately from the Medigap policy unless a licensed agent explains a specific coverage change.

Enrollment timing can determine whether coverage continues smoothly

Plan changes at year-end put enrollment timing at the center of the decision. Medicare’s Annual Enrollment Period is the customary time for beneficiaries to compare Medicare Advantage and Part D coverage for the next calendar year. Members whose plan is ending may also have enrollment options connected to the termination, but eligibility and timing depend on the circumstances described in their notices and Medicare guidance.

The practical lesson is to act before the last minute. Waiting can create avoidable gaps in understanding, especially if a beneficiary needs to verify a specialist, compare high-cost drugs, or request assistance from a licensed agent. It is also wise to save confirmation numbers and copies of enrollment materials after making a choice.

Our analysis: disruption risk is concentrated, not universal

Our analysis is that the KFF figures point to a meaningful coverage-transition risk for a defined group of beneficiaries, not a change to Medicare eligibility or a blanket end to Medicare Advantage or Part D. The reported 4.3 million affected by plan terminations and the additional 1.4 million in consolidating Medicare Advantage plans show why plan selection should be an annual review, even for members satisfied with current coverage.

A termination can be inconvenient, but it can also be an opportunity to reassess whether the prior plan still matched a beneficiary’s doctors, medicines, budget, and preferred way of receiving care. The best option is individual. Some people may prefer a Medicare Advantage plan with a specific network and supplemental benefits, while others may value Original Medicare with a Medicare Supplement policy and a separate Part D plan. Out-of-pocket costs, access, and drug coverage should guide the comparison.

Medicare Plan Path recommends that affected readers compare 2027 options using their personal provider and prescription lists, then consult Medicare resources or a licensed agent if they need help weighing choices. Do not assume a default or replacement plan is automatically the best fit. The key question is simple: will the available 2027 coverage still serve the care you expect to need?