physicians. In 1939, the first official Blue Shield plan was founded in California. In 1948, the symbol was informally adopted by nine plans called the Associated Medical Care Plan, and was later renamed the National Association of Blue Shield Plans. In the 1960s, the U.S. government chose to partner with Blue Cross and Blue Shield companies to administer Medicare. In 1982, Blue Shield merged with The Blue Cross Association to form the Blue Cross and Blue Shield Association (BCBS). Prior to 1986, organizations administering BCBS were tax exempt under 501(c)(4) as social welfare plans. However, the Tax Reform Act of 1986 revoked the exemption, because the plans sold commercial-type insurance. They became 501(m) organizations, subject to federal taxation, but entitled to "special tax benefits" under IRC 833. In 1994, BCBS changed to allow its licensees to be for-profit corporations. During 2010, Health Care Service Corporation, the parent company of BCBS in Texas, Oklahoma, New Mexico, Montana and Illinois, nearly doubled its income to $1.09 billion in 2010, and began four years of billion-dollar profits. In the final spending bill for FY 2015 after much lobbying since 2010, nonprofit Blue Cross and Blue Shield plans continue to have special tax breaks that were understood to be threatened by the Affordable Care Act of 2010. Current organization Blue Cross and Blue Shield insurance companies are licensees, independent of the association and traditionally of each other, offering insurance plans within defined regions under one or both of the association's brands. Blue Cross Blue Shield insurers offer some form of health insurance coverage in every U.S. state. They also act as administrators of Medicare in many states or regions of the U.S. The Blue Cross Blue Shield Federal Employee Program (FEP) is a nationwide option under the Federal Employees Health Benefits Program (FEHB) for U.S. federal government employees and retirees, and has been part of FEHB since FEHB's inception in 1960. FEP enrolls over half of the federal workforce, with over 5 million members, making it the largest insurer of federal employees and the largest single health plan group in the world. The association is headquartered in the Michigan Plaza complex in the Chicago Loop area of Chicago, Illinois. Member affiliated companies Multi-state private companies CareFirst District of Columbia Maryland Parts of Virginia (Alexandria City, Arlington County, Falls Church City, and parts of Fairfax County) Health Care Service Corporation BlueCross BlueShield of Illinois BlueCross