Medicare Advantage enrollees face growing uncertainty choosing plans, keeping doctors During open enrollment many seniors will find that choosing a plan is no longer just about premiums or benefits.

Thousands of Medicare Advantage beneficiaries are quietly confronting a dilemma this fall: Should they pick a new plan — or risk losing access to the doctors and hospitals they rely on?

During the open enrollment window for 2026, from Oct. 15 to Dec. 7, many seniors are discovering that choosing a plan is no longer just about premiums or supplemental benefits. Increasingly, it’s a question of whether their existing physicians and hospitals will remain in network.

For decades, Medicare Advantage plan sponsors — private insurers who manage Medicare benefits — negotiated quietly with hospitals and physician groups. But recently, the tension has become public and more frequent, forcing patients to weigh whether network stability matters more than benefits or premiums.

“Historically, these disputes between health systems and insurers would come up in employer-based insurance coverage,” Paul Ginsburg, health policy professor at the University of Southern California. “What’s different now is that this is the first time these disputes have affected Medicare Advantage plans. ... It’s a new phenomenon that’s very upsetting to people.”

For patients caught in the middle, these disputes can be devastating. Some need to switch doctors or insurance plans or potentially pay higher, out-of-network rates at a time when many Americans are already struggling to afford the rising cost of medical care, Ginsburg said.

In Oregon, one striking example has been Oregon Health & Science University, which nearly severed its contract with UnitedHealthcare over reimbursement disputes. Had no agreement been reached, more than 61,400 Medicare Advantage members would have lost in-network access to OHSU’s hospitals and clinics.

Ultimately, the two parties agreed to stay in network, but only after a standoff that played out in public with dueling direct-mail and advertising campaigns.

Earlier this year, negotiations between Salem Health — which operates one of the busiest emergency departments in the West Coast — and Regence BlueCross BlueShield broke down entirely. As of Jan. 1, Salem Health’s hospitals and clinics left Regence’s network. For seniors with Medicare Advantage plans through Regence, going to Salem Health’s facilities to get care means paying higher out-of-pocket costs.

These are not isolated incidents. Across the country, more health systems are pulling back from Medicare Advantage agreements. In the first half of 2025 alone, 28 health systems dropped Medicare Advantage contracts, according to Becker’s Hospital Review.

Experts say these disputes could be an early warning sign of more contract terminations ahead as hospitals and large doctor groups seek higher payments to offset inflation, health care workers’ wage increases and escalating prices for medical supplies and drugs.

At OHSU, hospital leaders said that a key strategy to shore up the academic medical center’s finances is securing higher reimbursement rates from private insurers. Dr. Shareef Elnahal, OHSU’s new president, said the university successfully negotiated better rates from UnitedHealthcare and is now in the middle of negotiations with Regence BlueCross BlueShield and Kaiser Permanente.

Ginsburg, the USC professor and former vice chair of the Medicare Payment Advisory Commission, a panel that makes recommendations to Congress on Medicare policy, said rising provider cost pressures, higher demands from health systems and growing denial or prior authorization burdens have pushed more providers to reconsider their Medicare Advantage participation. Ginsburg said these disputes also make health care access less predictable for seniors. He said there’s no easy way for beneficiaries to anticipate future disputes when choosing plans during the open enrollment period.

Under current rules, most Medicare Advantage enrollees can switch only during the annual open enrollment window. If a provider exits their plan’s network mid-year, such a disruption does not automatically trigger a special enrollment period, Ginsburg said. He said the Centers for Medicare and Medicaid Services has allowed special enrollment windows for those who lose access to critical providers, but only in a few isolated cases.

Some Medicare Advantage enrollees this open enrollment season may be considering switching back to traditional Medicare, which allows access to nearly any provider and generally has less prior authorization requirements.

But traditional Medicare lacks a built-in maximum out-of-pocket cap, which means enrollees often rely on supplemental Medigap insurance plans to fill cost gaps.

Purchasing this supplemental insurance can be unaffordable or even impossible for those who want to get on traditional Medicare after previously enrolling in an Advantage plan. That’s because MediGap insurers can deny coverage for existing health conditions such as diabetes or heart disease, or charge consumers more.

Ginsburg said older Americans typically have only one chance to buy Medigap without medical underwriting, and that’s when they first enroll in Medicare. Most states do not guarantee Medigap access after the initial enrollment window, the exceptions being Connecticut, Massachusetts, Maine and New York.

Meanwhile, some Medicare Advantage enrollees may find out this fall that their plan has been discontinued. If they’re not automatically enrolled in a new plan, they will qualify for a special enrollment period to choose another Advantage plan or switch back to original Medicare. Those who opt for original Medicare have guaranteed rights to buy a Medigap policy, meaning they can’t be denied coverage or charged more for preexisting conditions. But that window only lasts about 60 days after their plan ends.