Blue Shield of California is a mutual benefit corporation and health plan founded in 1939 by the California Medical Association. It is based in Oakland, California, and serves 4.5 million health plan members and more than 65,000 physicians across the state. Blue Shield of California was founded as a not-for-profit organization. As of 2014, it is no longer tax-exempt in California and has been paying federal taxes for several years before that. Blue Shield of California, then known as California Physicians' Service, was created by the California Medical Association in 1938. The organization was incorporated in 1939 and began offering coverage on March 6 of that same year. In 1946, the organization was among the founders of the National Association of Blue Shield Plans, which later became the Blue Cross and Blue Shield Association. In 1950, the Blue Shield of California health plan began offering catastrophic coverage. By 1961, it had one million subscribers of its health plan. From 1966 to 2018, the organization was headquartered at 50 Beale Street in San Francisco. More information...
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