Medicare Advantage switching was once a one-way street. For nearly two decades, enrollment grew every single year – until 2026, when as many as 2.9 million Medicare Advantage enrollees were forced to find new plans following a sharp rise in insurers exiting markets across the country, according to a February 2026 study in JAMA by researchers at the Johns Hopkins Bloomberg School of Public Health. The people pushing back aren’t fleeing bad plans randomly. They’re making a calculated decision – and the math, for a growing number of retirees, is starting to favor Original Medicare.
Medicare Advantage was built on a compelling pitch: low or zero monthly premiums, dental and vision extras, and everything bundled into one card. Enrollment had grown steadily for more than two decades, as plans increasingly offered supplemental benefits, charged low or zero cost premiums, and became available across most of the country. But that long growth curve has broken. Medicare Advantage enrollment was set to decline 2.6% year over year, compared with 3.7% growth in 2025, according to analysts at TD Cowen. For years, Original Medicare enrollment had declined in favor of Medicare Advantage. In 2026, however, Original Medicare enrollment increased by 600,000 beneficiaries.
The retreat isn’t just a numbers story. Behind every disenrollment figure is a retiree who made a choice – many of them voluntarily, many of them only after facing the parts of Medicare Advantage that the brochure didn’t emphasize. Enrollment in Medicare Advantage has increased steadily over the past two decades, with more than half of eligible beneficiaries enrolled since 2023. But as those cohorts age into their 70s and 80s, their healthcare needs get more complex – and that’s exactly when the differences between the two systems start to matter most.
The Prior Authorization Problem Driving Medicare Advantage Switching
No single issue has done more to push retirees toward Medicare Advantage switching than prior authorization – the requirement that a plan approve a treatment, test, or specialist visit before it happens.
Quality pressure is mounting: while average star ratings have stabilized, approximately 63.5% of Medicare Advantage members are now enrolled in plans of 4 or more stars, according to a 2026 analysis by TD Cowen reported by Healthcare Dive. But the more immediate friction for most enrollees is the approval process itself. According to a January 2026 KFF report, nearly 53 million prior authorization requests were made to Medicare Advantage insurers on behalf of enrollees in 2024, with insurers denying 7.7% of them.
That denial rate sounds manageable until you consider what it represents at scale. Medicare Advantage enrollees most likely to lose coverage include those enrolled in PPO plans, non-special needs plans, plans offered by smaller insurance carriers, and lower-rated plans. A 2022 report from the HHS Office of Inspector General – the most recent federal audit of this specific question – found that prior authorization “continues to be a leading source of care delays and frustration for patients and physicians alike.” The American Medical Association’s 2024 Prior Authorization Physician Survey documents that the process results in treatment delays, denials of medically necessary care, poorer patient health outcomes, and significant administrative burden – with physician offices completing an average of 39 prior authorization requests per week, requiring at least 13 hours of staff time.
The scale of coverage refusal also has a documented quality problem. According to a 2022 HHS Inspector General report, 13% of prior authorization requests that were ultimately denied for Medicare Advantage patients would have been approved under traditional Medicare – meaning they met the clinical standard for coverage, just not the plan’s internal criteria.
Almost all Medicare Advantage enrollees – 99%, according to the same KFF report – must obtain prior authorization for some services, compared to minimal requirements under traditional Medicare. New federal rules that took effect in January 2026 did tighten the timeline: CMS shortened the standard time frame for insurers to respond to prior authorization requests from 14 to 7 calendar days. Faster decisions are an improvement. But for retirees managing chronic illnesses like heart failure, diabetes, or cancer, being told “no” in seven days instead of fourteen doesn’t change the outcome.
Care quality and accessibility concerns are the most likely reasons retirees switch out of Medicare Advantage plans, according to reporting by Kiplinger. For someone who has lived with a condition for years and built a relationship with a specialist, having an insurer override that care relationship is often the final straw.
What Out-of-Pocket Costs Actually Look Like
Medicare Advantage plans are consistently marketed around their low or zero-dollar monthly premiums. More than three-quarters of individual Medicare Advantage enrollees – 76% – pay no plan premium other than the Part B premium in 2025, according to a KFF spotlight on 2026 Medicare Advantage premiums and benefits. That number looks great until you start using the plan heavily.
The maximum out-of-pocket limit for Medicare Advantage plans in 2026 cannot exceed $9,250 for in-network services and $13,900 for combined in-network and out-of-network services, according to Kiplinger’s Medicare Advantage survey coverage. Those are ceilings – the most you’d pay in a year – but they’re also the amounts you could reach after a hospital stay, a course of chemotherapy, or a hip replacement. For someone with a serious health event, the difference between a $0 premium and a four- or five-figure out-of-pocket bill becomes a painful calculation.
Original Medicare works differently – and the trade-off cuts both ways. Original Medicare, unlike Medicare Advantage, does not have an out-of-pocket maximum. That’s a real vulnerability for anyone without supplemental coverage. But for retirees who pair Original Medicare with a Medigap supplement policy, the picture shifts. After paying the Part B deductible, a Medigap Plan G policyholder faces essentially $0 in additional cost sharing for covered Medicare services. A fixed monthly premium for the Medigap plan replaces the uncertainty of unpredictable copays – a structure that appeals specifically to people managing multiple conditions who see several specialists each year.
The networks inside Medicare Advantage plans create a different kind of cost risk. The biggest disadvantage of Medicare Advantage plans is the potential limitation of providers you can see, limiting your selection of physicians and medical facilities if you have conditions requiring specialist care. Retirees who relocate, travel seasonally, or seek care at academic medical centers sometimes discover their plan simply doesn’t cover where they need to go. People with traditional Medicare have access to any doctor or hospital that accepts Medicare, anywhere in the United States – and that’s the vast majority of doctors and virtually all hospitals.
The Forced Disenrollment Wave Accelerating the Trend
A significant portion of Medicare Advantage switching in 2026 wasn’t voluntary. Insurers pulled back from markets at a pace not seen since the program’s early years. Annual forced disenrollment rates averaged just over 1% between 2018 and 2024. That rate climbed sharply to 6.9% in 2025 and reached 10% in 2026 – a tenfold increase in just the last two years, according to the Johns Hopkins Bloomberg School of Public Health research published in JAMA.
The exits weren’t random. Enrollees most likely to lose coverage were those in PPO plans, non-special needs plans, plans offered by smaller carriers, and lower-rated plans. Rural counties and counties with lower overall Medicare Advantage penetration were more likely to experience large-scale plan exits. For someone in a rural area who loses their only local Medicare Advantage plan, the realistic option is often Original Medicare – not a different Advantage plan, because there isn’t one.
Traditional Medicare enrollment grew by 600,000 beneficiaries this year, reversing years of decline, according to a February 2026 report from HealthScape Advisors and Chartis. Some of that growth reflects beneficiaries who actively chose Original Medicare. Some reflects people who had no choice. Either way, the direction of movement has reversed.
On the insurer side, the business case for expansion has weakened. After chasing growth in the Medicare market for more than a decade, health insurers have faced shrinking profits in their Medicare Advantage programs over the last two years, as members tally higher-than-expected medical costs and new regulations pressure government reimbursement rates. The larger insurers are now cutting back on unprofitable plans and exiting some markets altogether. Medicare Advantage enrollment grew just 2.5% in 2026 to a record 35.4 million beneficiaries, down from 3.6% in 2025.
Benefit quality followed the same trajectory. In 2026, total value added across general enrollment Medicare Advantage plans declined by more than 7%, with benefit reductions across all major service categories, according to consulting firm Milliman. A survey of Medicare Advantage plan leaders found that nearly 70% expect to offer fewer benefits next year – an increase from the 40% who said the same the year before, according to the same HealthScape Advisors and Chartis report. No respondents predicted richer benefits.
Read More: Why Retirees Are Rethinking Medicare Drug Plans
The Medigap Catch: What Switchers Need to Know
Switching from Medicare Advantage to Original Medicare isn’t complicated operationally – Medicare Advantage enrollees can switch to Original Medicare during the Medicare Advantage Open Enrollment Period, which runs from January 1 to March 31 each year. The harder part is securing Medigap coverage once you leave.
Beneficiaries who switch from a Medicare Advantage plan back to Original Medicare outside of a guaranteed-issue period can face potential Medigap denial or higher premiums based on pre-existing conditions. Guaranteed-issue rights – which require insurers to sell you a Medigap policy without health questions – exist only under specific circumstances. One of the most important: if a person is enrolled in a Medicare Advantage plan that’s terminating and won’t be available the coming year, that triggers a guaranteed-issue right for most Medigap plans. That was the case for some enrollees in 2025 and will again be the case for some in 2026, as some Medicare Advantage insurers are shrinking their coverage areas or discontinuing some plans.
State of residence matters enormously here. Four states – Connecticut, Massachusetts, Maine, and New York – require either continuous or annual guaranteed-issue protections for Medigap for all beneficiaries 65 and older. Everywhere else, an insurer can decline to sell you a Medigap policy or charge you more based on your health history, unless you qualify under a specific protected situation. Retirees with diabetes, heart disease, or cancer who live outside those four states need to assess their Medigap eligibility before they drop their Advantage plan – not after.
During the first year of Medicare Advantage coverage, there is a one-time trial period during which it’s possible to switch from Medicare Advantage to Original Medicare and still obtain a Medigap and Part D plan with guaranteed-issue rights. For anyone who enrolled recently and is having second thoughts, that window is worth using.
What This Means for You
The case for Medicare Advantage switching isn’t universal. For healthy retirees in their 60s who rarely use specialist care and are enrolled in a stable, high-rated plan in an urban area, the low-premium structure still makes financial sense. The calculus changes when health needs increase, when plans exit markets, when preferred doctors fall out of network, or when prior authorization requests start becoming a regular feature of managing a chronic condition.
If you’re evaluating your own situation, a few concrete questions clarify the picture faster than any comparison chart. First: how often do you need specialist care, and are those specialists in-network? Second: if you hit the out-of-pocket maximum this year – up to $9,250 for in-network services in 2026 – does your budget absorb that without derailing your retirement savings? Third: if you switch to Original Medicare, do you qualify for guaranteed-issue Medigap coverage, or would you face medical underwriting?
People switching from Medicare Advantage to Original Medicare tend to be those who have more significant health needs. That pattern makes sense. The benefits of Original Medicare’s flexibility and provider access become more valuable as health complexity increases. For anyone managing multiple chronic conditions and seeing multiple specialists, the predictable cost structure of a Medigap Plan G – a fixed monthly premium and near-zero additional cost sharing – often offers more financial stability than an Advantage plan’s theoretical cap, particularly once you factor in copays for each specialist visit, each imaging order, and each hospitalization stay.
Before You Decide, Get Free Help
State Health Insurance Assistance Programs, known as SHIPs, offer free, unbiased counseling to Medicare beneficiaries comparing their options. You can find your local program through shiphelp.org. No broker commission, no product to sell – just help understanding what you’re actually choosing between.
The window for acting is specific. Medicare Advantage Open Enrollment runs January 1 through March 31 each year – that’s the period when you can switch from Medicare Advantage to Original Medicare and simultaneously enroll in a standalone Part D drug plan. If you’re in a plan that was discontinued, you also have a Special Enrollment Period, and in most cases, a guaranteed-issue right to buy a Medigap policy without health screening. Missing these windows doesn’t lock you out forever, but it does narrow your options – particularly on the Medigap side if you have pre-existing conditions and live outside one of the four states that offer year-round protections.
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AI Disclaimer: This article was created with the assistance of AI tools and reviewed by a human editor.