Medical Mutual of Ohio Medical Mutual of Ohio Search | Advanced Search | New Members | Coupons and Discounts | All Categories Health Care >> Direct Health and Medical Insurance Carriers Medical Mutual of Ohio 545 Metro Place South, Suite 430Dublin, OH 43017 | map | directions (614) 621-6900 | fax: (614) 621-4578 Visit Site Currently serving 1.6 million members. Medical Mutual, an Ohio-base mutual health insurance company with regional offices in Powell, has offered individual and group health plans to businesses like yours for more than 75 years. Member Since: 2010 Need to update your categories or expand your listing? Or want to learn how your business can become a part of the Chamber? Contact us at membership@columbus.org for assistance.