Highmark Inc. · Pittsburgh, PA United States

Highmark has staked its claim as the largest health insurer in the Keystone state. A licensee of the Blue Cross and Blue Shield Association, the not-for-profit firm covers some 4 million people in central and western Pennsylvania, as well as the Lehigh Valley. It serves another 800,000 customers in West Virginia and other areas of Pennsylvania through affiliations and partnerships with other insurers, and it provides administrative and network-access services nationally. In addition, Highmark sells Medicare Advantage and prescription drug plans to seniors in both states. Other subsidiaries (not operating under the BCBS license) provide dental insurance, vision care, and other products and services nationwide. To read the full description, subscribe now.