Cigna is an American worldwide health services organization based in suburban Bloomfield, Connecticut and Philadelphia, Pennsylvania. Its insurance subsidiaries are major providers of medical, dental, disability, life and accident insurance and related products and services, the majority of which are offered through employers and other groups (e.g. governmental and non-governmental organizations, unions and associations).

For more than 200 years, Cigna and its predecessor companies have been in the insurance field. In 1792, a group of Philadelphia citizens formed the Insurance Company of North America (INA), the first marine insurance company in the United States. In 1865, the Governor of Connecticut signed a special law creating Connecticut General Life Insurance Company (CG). In 1982, Cigna was formed through the combination of INA Corporation and Connecticut General Corporation.

Cigna offers Medicare and Medicaid products and health, life and accident insurance coverages primarily to individuals in the U.S. and selected international markets. In addition to its ongoing operations described above, Cigna also has certain run-off operations, including a Run-off Reinsurance segment. In the Phoenix metropolitan area, Cigna runs a full-service staff-model HMO (health maintenance organization) with satellite clinics throughout the region, known as the Cigna Medical Group.

Cigna Global Health Benefits also operates under the Cigna corporation. Cigna’s motto is 'Together, all the way.' The company ranked No. 73 in the 2018 Fortune 500 list of the largest United States corporations by total revenue.

According to wikipedia