Horizon BCBSNJ is the State’s Oldest and Largest Health Insurer Horizon Blue Cross Blue Shield of New Jersey traces its history back to 1932, when Associated Hospitals of Essex County, Inc. began selling multi-hospital, pre-payment plans for $10 a year, which covered 21 days of in-patient care. The company was one of the first health insurance companies in the nation and also one of the first Blue Cross plans. Today, Horizon BCBSNJ serves more than 3.6 million members. In 2010, the company processed more than 57.6 million claims totaling more than $13 billion for its members. The company has more than 4,800 employees and is headquartered in Newark with offices in Harrison, Wall Township, Mt. Laurel, and West Trenton. Horizon BCBSNJ is incorporated under New Jersey statute as a not-for-profit, health service corporation. Under its certificate of incorporation, Horizon BCBSNJ operates as a health insurance business for the benefit of its members.