Medicare Advantage Disenrollment Just Hit a 10x Spike — 2.9 Million Seniors Are Scrambling

A JAMA research letter published this month reveals that forced Medicare Advantage disenrollment rates have surged from a historical average of 1% to 10% for 2026 — a tenfold increase in two years. Nearly 2.9 million beneficiaries must find new coverage as insurers flee unprofitable markets. For dental and medical practices built on MA patient panels, the downstream disruption is already underway.

What Happened

For years, Medicare Advantage was a one-way escalator. Insurers added benefits, brokers pushed enrollment, and seniors signed up in record numbers. By 2025, KFF data showed 54% of eligible Medicare beneficiaries — 34.1 million people — were in MA plans. UnitedHealth Group and Humana alone controlled 46% of the market. The growth seemed inexorable.

Then the economics broke. Three forces converged simultaneously: CMS finalized the V28 risk adjustment model, which eliminated over 2,000 diagnostic codes insurers had used to inflate capitation payments, reducing average risk scores by 3-8%. Medical costs spiked — UnitedHealth's medical loss ratio jumped from 85.5% in 2024 to 88.9% in 2025, while operating margin at UnitedHealthcare was slashed from 5.2% to 2.7%. And CMS rate updates continued tightening. The squeeze was lethal for marginal markets.

Insurers responded by fleeing. UnitedHealthcare pulled out of 109 counties. Humana, Aetna, and regional carriers followed, exiting markets they no longer deemed financially viable. The Johns Hopkins research team that authored the JAMA study found that among non-special needs plans specifically, the forced disenrollment rate hit 12.4%. In 12 states, more than 20% of MA enrollees were displaced. Vermont was devastated — 92.2% of its MA enrollees faced forced disenrollment. Idaho, North Dakota, South Dakota, and Wyoming all exceeded 40%.

The result: overall MA enrollment growth decelerated to 3% year-over-year as of February 2026, with KFF reporting just over 35 million enrollees. Seven states — Vermont, Wyoming, New Hampshire, Idaho, Minnesota, Maryland, and South Dakota — saw outright enrollment declines. UnitedHealth Group's MA enrollment dropped more than 5%. The MA growth story that powered insurer valuations for a decade is unwinding in real time.

The Risks

The most immediate risk is patient disruption at scale. When 2.9 million seniors are forced to find new plans, they do not all land smoothly. Some switch to another MA plan with a different network, meaning their current providers are suddenly out-of-network. Some return to traditional Medicare, which offers broader provider access but lacks the supplemental dental, vision, and hearing benefits that drew them to MA in the first place. Either path creates confusion, coverage gaps, and missed appointments. If your practice has a concentrated MA patient panel, expect scheduling turbulence, insurance verification failures, and a spike in patients showing up with coverage they do not fully understand.

Dental practices face a uniquely acute version of this problem. Traditional Medicare does not cover routine dental care. MA plans offering dental benefits — and 98% of individual MA plans still do — have been a primary vehicle for seniors accessing preventive and restorative dental services. When a patient is forcibly disenrolled from an MA plan and lands in original Medicare, their dental coverage vanishes entirely. They do not lose their dentist; they lose the ability to afford their dentist. For practices in rural markets where MA penetration was already lower and plan exits are concentrated, the patient attrition risk is severe. Oregon felt this directly: Samaritan Health Plans exited Medicare Advantage for 2026, displacing nearly 14,000 members across three counties in the mid-Willamette Valley and central coast. The number of MA plans available to Oregonians dropped from 109 to 102.

Even for patients who stay in MA, benefit erosion is accelerating. UnitedHealthcare added coinsurance to non-preventive dental services in comprehensive plans for 2026 and eliminated periodontal maintenance coverage from preventive-only plans. These are not marginal adjustments — they shift hundreds of dollars per patient per year from insurer to patient. Across the industry, supplemental benefits are being trimmed: KFF reports OTC allowances dropped from 73% to 66% of plans, meal benefits from 65% to 57%, and transportation from 30% to 24%. Dental has held at 98% availability, but the depth of coverage is thinning. Plans are keeping the headline benefit while hollowing out what it actually pays for.

The financial contagion extends to insurers themselves. UnitedHealth Group posted $12.1 billion in profit for 2025, down from $14.4 billion the prior year — a 16% decline. UnitedHealthcare's earnings from operations cratered from $15.6 billion to $9.4 billion. Humana, with nearly its entire business concentrated in MA, is navigating even tighter constraints. When the two largest players are bleeding margin, every downstream provider should expect reimbursement pressure, utilization management escalation, and network compression to intensify.

The Opportunity

Disruption of this magnitude creates openings for practices that move decisively. The 2.9 million displaced beneficiaries need to go somewhere — and many will actively search for providers who can help them navigate the transition. Practices that proactively reach out to their MA patients before plan terminations take effect, explain coverage options, and offer continuity pathways will retain patients that competitors lose. A simple outreach campaign — letter, email, phone call — to every patient on an exiting MA plan costs almost nothing and can prevent thousands in lost production.

The dental benefit gap is a specific opportunity. Seniors who lose MA dental coverage and land in traditional Medicare will face a choice: pay out of pocket or stop going to the dentist. In-house membership plans — $25-40/month for preventive care with discounted restorative — are purpose-built for exactly this population. They are predictable revenue for the practice and affordable access for the patient. If you have not launched a membership plan, the 2.9 million disenrolled seniors just gave you the business case. The addressable market for practice-direct dental plans just expanded by millions of potential members overnight.

For medical practices and health systems, the shift back toward traditional Medicare may actually improve reimbursement. Original Medicare with Medigap supplemental coverage often pays higher effective rates than MA plans, with fewer prior authorization requirements and faster claims processing. Practices that have been subsidizing MA plans at below-cost reimbursement rates may find that patient migration to traditional Medicare improves their per-visit economics — if they are prepared to manage the transition.

Action Items

1. Identify every patient on an exiting or terminated MA plan immediately. Cross-reference your patient roster against CMS plan termination data for your county. Flag affected patients and initiate outreach within the next 30 days. Do not wait for patients to call you confused — get ahead of it.

2. Model the revenue impact of MA disenrollment on your practice. Calculate what percentage of your MA revenue is tied to plans that have exited or reduced benefits. Project the worst case — 20-30% of those patients not returning — and build a mitigation plan. Know your exposure in dollar terms, not percentages.

3. Launch or accelerate an in-house membership plan for dental practices. Target the displaced MA dental patients specifically. Price it competitively against what they were getting through their MA supplemental benefit. A $35/month plan that includes two cleanings, exams, and 15-20% off restorative is compelling to a senior who just lost their dental coverage entirely.

4. Renegotiate or exit underperforming MA contracts before renewal. If your remaining MA payers are paying below your fully loaded cost on high-volume codes, this is the moment to escalate. Insurers losing members need providers to stabilize their remaining networks. Your leverage is higher than it was 12 months ago — use it.

5. Invest in insurance verification and eligibility automation. With millions of beneficiaries switching plans, the risk of claim denials due to eligibility mismatches will spike in Q1 and Q2. Real-time eligibility verification at scheduling and check-in — not just at billing — prevents the revenue cycle disruption before it starts.

Bottom Line

The Medicare Advantage disenrollment spike is not a blip — it is the market correcting after years of unsustainable insurer economics. Nearly 3 million seniors are being displaced, dental benefits are eroding beneath the surface, and the insurers driving this contraction are themselves under historic margin pressure. The practices that treat this as a patient retention emergency and a membership plan opportunity — rather than waiting for the dust to settle — will capture the patients and revenue that their competitors lose. The data is unambiguous. Move now.

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