Blue Shield of California

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 years before that.