Centene, WellCare merger expected to close this week Ryan Voyles 5 years ago The planned merger between Centene Corporation and WellCare Health Plans has satisfied all regulatory approvals and could close as early as Thursday, the companies announced Wednesday.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.