Along with the occasional aches and pains, growing older can bring surprise setbacks and serious diseases. Longtime relationships with doctors people trust often make even bad news more tolerable. Losing that support — especially during a health crisis — can be terrifying. That’s why little-known federal requirements are supposed to protect people with privately run Medicare Advantage coverage when contract disputes lead their health care providers and insurers to part ways.

But government documents obtained by KFF Health News show the agency overseeing Medicare Advantage does little to enforce long-standing rules intended to ensure about 35 million plan members can see doctors in the first place.

In response to a Freedom of Information Act request covering the past decade, the Centers for Medicare & Medicaid Services produced letters it sent to only five insurers from 2016 to 2022 after seven of their plans failed to meet provider network adequacy requirements — lapses that could, in some cases, harm patient care.

Agency officials said some plans lacked enough primary care clinicians, specialists, or hospitals, according to the letters. And they warned that failure to meet the requirements could result in a freeze on marketing and enrollment, fines, or closure of the plan.

Medicare Advantage is an increasingly popular alternative to the government-run Medicare program, which covers adults 65 and older and some people with disabilities. Of the 63 million Americans who were eligible to join Advantage plans instead of traditional Medicare, 54% did so for this year. The plans usually offer lower out-of-pocket costs and extra benefits, like coverage for vision, dental, and hearing care, but typically require their members to stick to select networks of doctors, hospitals, and other providers. Last year, the federal government paid Advantage plans an estimated $494 billion to care for patients.

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