– Health Alliance Medical Plan, Inc. (HAMP) – (HMO 和 POS) – Health Care Service Corporation,一家共同法定储备公司 (HCSC,又名 Blue Cross Blue Shield) – (HMO 和 PPO) – Medical Associates Health Plans – (HMO 和 POS) – MercyCare HMO Inc. – (HMO) – Quartz Health Benefit Plans Corporation (Quartz) – (HMO 和 POS) – Quartz Health Insurance Corporation (Quartz PPO) – (PPO) – UnitedHealthcare of Illinois, Inc. – (HMO) – UnitedHealthcare Insurance Company of Illinois – (POS) – UnitedHealthcare Insurance Company of the River Valley – (POS) – UnitedHealthcare Plan of the River Valley, Inc. – (HMO)