Aetna is an American health insurance company based in Hartford, Connecticut. It was founded in 1853 and is one of the largest health insurance companies in the United States. AETNA provides a range of health insurance products and services, including medical, dental, pharmacy, behavioral health, disability, and long-term care insurance. It also offers Medicare and Medicaid plans. AETNA has over 50 million members and serves customers in all 50 states.