Illinois: Blue Cross Blue Shield of Illinois ranks highest, followed by UnitedHealthcare. Blue Cross Blue Shield of Illinois ranks highest, followed by UnitedHealthcare. Ohio: Anthem Blue Cross and Blue Shield ranks highest for a second consecutive year, followed by Aetna Medicare. Pennsylvania: UPMC For Life ranks highest for a third consecutive year, followed by Highmark Blue Cross Blue Shield and Independence Blue Cross. UPMC For Life ranks highest for a third consecutive year, followed by Highmark Blue Cross Blue Shield and Independence Blue Cross.