Founded in 1934, Medical Mutual is the oldest and largest health insurance company based in Ohio. The company serves 2.8 million customers through its high-quality, affordable group and individual health insurance plans, traditional indemnity coverage and third-party administrative services to self-insured group customers. Medical Mutual's annual premium and service-generated revenue is $1.6 billion. Medical Mutual's SuperMed Plus plan was the first preferred provider organization in the nation to be accredited by the National Committee for Quality Assurance. Based in Cleveland, Medical Mutual also has offices in Columbus, Cincinnati, Toledo, Akron, Dayton and Youngstown.