Why Retirees Are Leaving Medicare Advantage

Something significant is happening in Medicare. After years of steady growth, Medicare Advantage enrollment has begun to see something new: a meaningful and growing trend of beneficiaries switching away from Medicare Advantage and returning to Original Medicare.

These are not people who made a mistake enrolling in Medicare Advantage. Many of them were healthy when they enrolled. The plans looked great on paper: low or no premiums, extra benefits, familiar insurance company names.

What they discovered over time is different. And it is worth understanding. If you want the broader context first, our overview of why some experts say Medicare Advantage Plans fall short is a good place to start.

The Medicare Advantage Growth Story (and Its Cracks)

Medicare Advantage enrollment grew dramatically over the past two decades. By 2024, more than half of all Medicare beneficiaries were enrolled in a Medicare Advantage plan, a milestone the private insurance industry celebrated.

The growth was fueled by attractive marketing, low monthly premiums, added benefits like dental and vision coverage, and a strong push from insurance companies and brokers incentivized to sell these plans.

But as the Advantage-enrolled population has aged, and as CMS has tightened overpayment rules and audited plan practices more aggressively, something has shifted:

Plans have scaled back extra benefits
out-of-pocket costs have risen
Networks have narrowed
Prior authorization requirements have intensified
Plan withdrawals have left beneficiaries scrambling

The people who signed up at 65 because the plan seemed like a good deal are now in their 70s and 80s, with more complex health needs, more doctors they rely on, and more personal experience with what their plan actually covers when it counts. For a fuller list of what to watch for, see our overview of the hidden risks of Medicare Advantage you’re not hearing about.

What Retirees Are Discovering

The stories follow a pattern. Beneficiaries do not switch away from Medicare Advantage on a whim. They switch after hitting a wall.

“My plan changed, and suddenly my doctors weren’t covered.”

Medicare Advantage networks change every year. A doctor who is in-network in January may not be in January of the following year. Beneficiaries who built relationships with specialists, primary care physicians, and hospitals find those relationships disrupted when providers leave the network.

For older beneficiaries with established care teams, an endocrinologist they trust, a cardiologist who knows their history, a rheumatologist who took years to get right, losing that continuity is not a minor inconvenience. It can affect ongoing treatment.

“I needed surgery and my plan kept denying the authorization.”

Prior authorization delays are the most commonly cited reason for switching. Beneficiaries who developed serious conditions, including cancer, joint replacements, cardiac procedures, and spinal surgery, often found their care delayed or denied pending authorization reviews. Our guide on prior authorization under Medicare Advantage breaks down how this process works and how often it goes wrong.

Some waited weeks. Some had procedures canceled. Some received care and then discovered they had to fight to have it covered retroactively.

The frustration is acute because the person feels sick, their doctor has determined they need treatment, and an insurance company reviewer who has never examined them is making a different determination.

“My Premium was $0 but my bills were not.”

The $0 premium that attracted many people to Medicare Advantage is a feature of the plan design: the costs are shifted into cost-sharing. Copays, Coinsurance, and especially out-of-pocket maximums can add up quickly.

For a beneficiary who needs a hip replacement, multiple specialist visits, physical therapy, and post-acute care, hitting the plan’s out-of-pocket maximum in a bad year is not hypothetical: it is a real financial event.

Medicare Advantage out-of-pocket maximums have risen significantly. The maximum can be as high as $9,250 for in-network care and $13,900 for in- and out-of-network combined for some plans (2026 amount; confirm current year at Medicare.gov).

Compare that to a Medigap Plan G with a roughly $185 to $250 per month premium and an annual Part B Deductible of $283 (2026 amount; confirm current year at Medicare.gov), and then $0 for everything Medicare covers for the rest of the year.

“My plan stopped covering benefits I relied on.”

Medicare Advantage plans made their reputations partly on supplemental benefits: dental, vision, hearing, fitness memberships, transportation. These are real benefits that Original Medicare does not provide.

But these benefits are discretionary. Plans can reduce or eliminate them each year. The $1,200 annual dental benefit that attracted someone at 65 may be $800 at 70 and gone at 75, just as dental needs typically increase.

Beneficiaries who built their financial planning around those extra benefits discovered they could not rely on them.

The Underwriting Problem: Why Switching Later Is Harder

This is the most important structural issue with starting on Medicare Advantage.

When you first become eligible for Medicare at 65, you have a six-month Medigap Open Enrollment Period during which you can buy any Medigap plan with no health questions and no underwriting. This is a federal guarantee.

Once that window closes, most states allow Medigap insurers to ask health questions, and to decline you or charge more based on pre-existing conditions.

When someone who enrolled in Medicare Advantage at 65 is now 73 with diabetes, hypertension, and a history of cardiovascular procedures, they may not be able to get a Medigap plan through standard underwriting. Or they may get one at a significantly elevated premium. Our guide on switching from Medicare Advantage to Medigap walks through what this process looks like and what to expect.

This creates a trap. The person who wants to switch to Medigap for better coverage finds that Medigap is no longer easily accessible to them because of the health conditions that developed while they were on Medicare Advantage.

People who enrolled in Medigap at 65, when their health was good, never face this problem. Their Medigap plan cannot be taken away because of new health conditions. The premiums increase over time, but the coverage stays.

2026: A Tipping Point for Medicare Advantage

Changes to Medicare Advantage in 2026 accelerated the switching trend.

CMS tightened overpayment rules, reducing the revenue insurers receive per beneficiary. In response, multiple major insurers, including United Healthcare, Humana, and others, made significant changes to their Medicare Advantage offerings. For more on what this looked like in practice, see our overview of how the 2026 Medicare Advantage changes left millions without a plan:

Scaled back or eliminated dental, vision, and hearing benefits
Increased copays and deductibles
Narrowed provider networks
Withdrew plans from certain counties and service areas entirely

Approximately 4 million Medicare Advantage enrollees faced plan changes, plan discontinuation, or both for 2026. For people whose plans were discontinued, this created an unexpected crisis: suddenly needing to choose a new plan under time pressure, or transitioning back to Original Medicare.

For those forced back to Original Medicare without having a Medigap plan ready, or who could not qualify for Medigap due to health conditions, the transition was genuinely difficult.

What People Who Switch to Medigap Report

When beneficiaries successfully make the transition to Original Medicare plus Medigap, the most common feedback is consistent:

Relief at the simplicity. No more calling a customer service line to get prior authorizations. No more wondering if the specialist is in-network. No more explaining to the billing department why a Claim was denied.

Appreciation for provider access. Seeing any Medicare-accepting doctor in the country, choosing the best specialist for their condition, going to the cancer center they want: these feel like freedoms people did not fully appreciate until they did not have them.

Financial predictability. Knowing that the monthly Medigap premium is their primary cost, and that major hospitalizations or procedures will not result in thousands of dollars of unexpected bills, provides real peace of mind.

Regret about not starting with Medigap. Many people who had good health when they were on Medicare Advantage and successfully switched to Medigap at a later point say the same thing: they wish they had chosen Medigap at 65. The few years of premium savings on Medicare Advantage were not worth the eventual challenge of switching.

Who Should Still Consider Medicare Advantage?

Medicare Advantage is not the wrong choice for everyone. It tends to work best for people who:

Are in good health and use minimal care
Have modest budgets where the premium savings matter significantly
Have access to a high-quality plan with a broad network in their area
Are unlikely to need complex specialist care, major surgery, or extended post-acute care
Understand the network, prior authorization, and benefit-change risks and accept them

For people who have complex health needs, are heavy healthcare users, travel extensively, or want access to top-tier specialty care, the math and the experience often favor Medigap.

Frequently Asked Questions

If so many people are leaving Medicare Advantage, why do plans keep growing?
New enrollees at 65 continue to be attracted by low premiums and extra benefits. The switching trend represents a segment of experienced enrollees who have encountered problems, not a reversal of overall growth. But the trend is real and accelerating.

Is Medicare Advantage going to get worse?
CMS has been tightening oversight and reducing overpayments, which is squeezing plan margins. Plans have responded by reducing benefits and narrowing networks. The trend toward higher cost-sharing and fewer extras appears likely to continue.

I want to switch to Medigap but I have health conditions. Can I still qualify?
In most states, you will need to go through underwriting. Some people with significant health conditions are declined. A few states have protections that allow year-round enrollment with no underwriting. A licensed Medicare advisor can evaluate your specific situation and identify the best path forward.

Bottom Line

The trend of retirees switching away from Medicare Advantage reflects real-world experience with how these plans work when serious health needs arise. Prior authorization barriers, narrowing networks, rising out-of-pocket costs, and benefit reductions have motivated many beneficiaries to pay for Medigap’s simplicity and certainty.

The best time to choose Medigap is at 65, when your health is good and your open enrollment guarantees are intact. If you are already on Medicare Advantage and concerned about your coverage, now is the right time to explore your options.

REMEDIGAP’s licensed advisors can help you evaluate your current plan, understand your switching options, and find the right Medigap plan if you qualify.

This article is for educational purposes. Medicare Advantage enrollment trends, plan details, and CMS rules change annually. Verify current details at CMS.gov or Medicare.gov, or speak with a licensed Medicare advisor.

💡 Your next step: Thinking about switching from Medicare Advantage? See how Medicare Supplement plans compare to Medicare Advantage — most people are surprised by the difference.

Michael Quinn

Michael Quinn is a licensed Medicare insurance expert and cofounder of REMEDIGAP. With over a decade of experience, he helps people compare coverage options with clear, unbiased guidance. His insights have been featured by USA Today, NerdWallet and many other publications.

Why Retirees Are Switching Away from Medicare Advantage