When Jody Sabatino opened her mailbox last month, she got some jaw-dropping news: Her insurance company, UnitedHealthcare, was cutting the 79-year-old's most trusted doctor from its Medicare Advantage plan. In fact, four of her six regular doctors won't be covered at all next year. "I couldn't believe it. I just couldn't believe it," Sabatino said. What's easier to believe for those affected by the cuts is that because Obamacare makes it harder for insurers to cut patients from their rolls, they're cutting doctors instead -- and hoping patients follow them off the plan.