Aetna invests in Medicare Advantage Nov 17, 2023 | On The Record, Top Stories Next year, Aetna will offer Medicare Advantage plans in all but one of Illinois’ 102 counties. In 2023, the CVS Health-owned insurer offered coverage in 88 counties.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.