Carle, Aetna reach tentative agreement on Medicare Advantage PPO Ryan Voyles 2 years ago Carle Health and Aetna said Monday they've reached an agreement so the Urbana-based provider will be in network for the insurer's Medicare Advantage plan.To access this content, you must purchase 1 Year Health News Illinois Subscription or 1 Year Group Subscription - Up to 5 Users, or log in if you are a member.