UnitedHealthcare, Humana and Aetna Shrink Their Medicare Advantage Footprints for 2026 as Benefits Are Trimmed

The largest private Medicare insurers are shrinking where they sell and what they offer. Healthcare Dive reported on October 2, 2025, using plan data that the Centers for Medicare & Medicaid Services (CMS) released on October 1, that UnitedHealthcare, Humana and CVS Health's Aetna had all reduced their Medicare Advantage service areas for 2026. This article summarises that report and the analyses it cites. An earlier version of this article included an estimate that UnitedHealthcare was exiting plans serving roughly 600,000 members; the report we reviewed does not contain that figure, so it has been removed. The article is general information for readers and does not recommend any plan.

What is Medicare Advantage? Medicare Advantage is the privately run alternative to traditional Medicare in the United States. Insurers contract with the federal government and receive a payment for each enrolled senior, then offer plans that must cover what traditional Medicare covers and often add extras such as dental, vision or over-the-counter allowances. Plans commonly use provider networks and can differ in premiums, deductibles and out-of-pocket limits.

Which insurers pulled back? According to the report, UnitedHealthcare, the largest carrier, is offering plans in one fewer state and 109 fewer counties than a year earlier. Humana has the largest reduction of the three, with plans in three fewer states and 194 fewer counties. Aetna is exiting one state and 100 counties. Not every carrier retreated. Elevance Health added one state and 64 counties but exited the Part D prescription drug market entirely. Centene kept the same number of states and added 51 counties. Kaiser made no service-area changes, though it closed certain plans in the mid-Atlantic region and Washington state. Two smaller carriers, UCare of Minnesota and Samaritan Health Plans of Oregon, are leaving Medicare Advantage. Healthcare Dive estimates that hundreds of thousands, possibly more than one million, members may need new plans during open enrollment, which runs from October 15 to December 7.

What is happening to premiums? The report presents two views. CMS projects that the average monthly premium across all Medicare Advantage plans will fall from $16.40 to $14, a figure that includes group plans and special needs plans. However, for the general enrollment population, which Healthcare Dive says accounts for most of the programme, a Morgan Stanley analysis of CMS data found that enrollment-weighted premiums rise by $2.84 a month, or almost 22%. The difference comes from which plans are included and how they are weighted. A senior in an average county will have 41.9 plan choices in 2026, down from 42.8, according to an analysis by ATI Advisory.

How are benefits changing? According to a TD Cowen research note cited in the report, Aetna, Elevance and UnitedHealthcare cut over-the-counter allowances in non-special needs plans, and UnitedHealthcare and Humana cut them in special needs plans too. Analysts say insurers are raising deductibles and out-of-pocket maximums. Major carriers are prioritising health maintenance organisation plans, which have narrower networks and give insurers more control over medical costs, and are shifting broker commissions to steer enrollment toward more profitable plans. UnitedHealthcare said in a statement that its 2026 offerings preserve access to affordable Medicare Advantage plans despite programmatic funding cuts.

How big is the market? The six largest carriers, UnitedHealthcare, Humana, Aetna, Elevance, Kaiser and Centene, covered about 25.2 million seniors as of September 2025, almost three-quarters of Medicare Advantage enrollment. The report says the administration projects total enrollment to fall to 34 million from almost 35 million, which would be the first year-over-year decrease in roughly two decades. A projection is not an outcome, and final enrollment will be known only after the open enrollment period and CMS reports.

Why are insurers pulling back? The report links the retreat to government reimbursement pressures and rising medical costs, and to insurers' efforts to restore margins by leaving underperforming areas. Our reading of the report is that rural counties and less-profitable products are more exposed, but the source does not quantify this, so readers should not assume a particular county is affected.

What should seniors do? First, read the Annual Notice of Change that your plan must send before open enrollment. It will list changes to premiums, benefits, networks and drug coverage. Second, check that your doctors, hospitals and prescriptions are covered in the plan you choose, since networks and formularies change. Third, look at the out-of-pocket maximum, because a low premium can come with a high maximum if you need care. Fourth, if your plan is ending, you will normally be able to choose another plan or return to traditional Medicare, but the rules on supplemental coverage in traditional Medicare differ by state and by health status, so check before leaving a plan. Free counselling is available through State Health Insurance Assistance Programs.

What should investors and policymakers watch? For insurers, the questions are whether margin recovery offsets lost membership and how the 2027 payment notice from CMS affects plans. For policymakers, the question is whether plan exits leave gaps in rural areas. The report we reviewed does not answer these, and they depend on later data.

What are the limits of this summary? The service-area changes are counts of states and counties compared with 2025, and they do not tell us how many people live in those counties. The premium figures are averages, and a single plan can be very different. The benefit cuts are described by analysts across carriers, not by plan, so a specific plan's change must be checked in its own documents.

This article summarises a trade report and analyst commentary and is not insurance advice.