On the record with Karen Brach, President, Meridian Health Plan of Illinois Ryan Voyles 6 years ago When Harmony Health Plan folded into Meridian Health Plan of Illinois earlier this year, the state’s largest managed care organization grew even larger.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.