Aetna CVS Health to enter Illinois ACA marketplace Ryan Voyles 2 years ago Aetna CVS Health said Thursday it will enter the Affordable Care Act exchange in three Illinois counties. The plans will be available in Cook, Lake and McHenry 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.