(Corrects county exits in 2026 described in paragraph 3 to total 109 from 16, as UnitedHealth clarified an error in the initial figure the company gave.) By Amina Niasse NEW YORK (Reuters) -UnitedHealth said it will stop offering Medicare Advantage plans in 109 U.S. counties in 2026, impacting 180,000 members, as the company balances higher costs with reimbursement pressure in the insurance program. "The combination of (Centers for Medicare and Medicaid Services) funding cuts, rising healthcare costs an ...