– Aetna Health Inc. (Aetna Health) – (HMO) – Aetna Life Insurance Co. (Aetna Life) – (HMO) – Celtic Insurance Company (Celtic) – (HMO) – CIGNA HealthCare of Illinois, Inc. (Cigna) – (HMO) – Health Care Service Corporation,一家共同法定储备公司 (HCSC,又名 Blue Cross Blue Shield of IL) – (HMO、POS 和 PPO) – Health Alliance Medical Plans, Inc. (HAMP) – (HMO 和 POS) – MercyCare HMO, Inc. (MercyCare) – (HMO) – Molina Healthcare of Illinois, Inc. (Molina) – (HMO) – Oscar Health Plan, Inc. (Oscar) – (HMO) – Quartz Health Benefit Plans Corporation (Quartz) – (HMO) – UnitedHealthcare of Illinois, Inc. (United) – (HMO)