Medicare open enrollment runs through Dec. 7, allowing beneficiaries to switch between original Medicare, Medicare Advantage, or Part D plans. The federal shutdown may delay access to some information, so experts advise taking time before finalizing decisions. It's crucial to review coverage changes, preferred providers, and medication costs, as plans and benefits vary. New details on Medicare Advantage benefits and provider networks are available, and reviewing prescription coverage is essential to minimize out-of-pocket costs.