Eldon Clingan has had the same cancer specialist at Dana-Farber Cancer Institute for more than two decades. He trusts her,he said, and credits her with saving his life.

Starting Oct. 1, though, the 88-year-old retired accountant will either have to find a new oncologist or change insurance plans because his Medicare Advantage plan is dropping Dana-Farber from its network.

The Medicare plan, run by the insurance arm of Mass General Brigham, has about 20,500 members, though only a fraction are receiving cancer care at Dana-Farber at any one time.

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