SSM Health’s WellFirst Health to launch Medicare Advantage plans in Illinois Aug 28, 2020 | Insurance, Medicaid/Medicare, Top Stories St. Louis-based SSM Health will offer Medicare Advantage plans in Illinois Metro East region next year, the company announced Thursday.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.