It is the oldest and largest health insurance company based in Cleveland, Ohio, and serves more than 1.6 million customers.

[3] Headquartered in Cleveland's historic Rose Building, the company also has statewide offices in Cincinnati, Columbus, Dayton, Independence, Richfield, Toledo and Youngstown, as well as an information systems facility in Beachwood.

[8] In 1997, the company left the Blue Cross/Blue Shield Association and re-claimed the name of one of its predecessors, becoming the present day Medical Mutual of Ohio.

[9] Rick Chiricosta,[14] born February 23, 1956, is chairman, president, and chief executive officer of Medical Mutual of Ohio.

Besides professional teams, the company is also the official insurer of numerous colleges and universities and local organizations, like the Rock and Roll Hall of Fame and Museum.