10. Kaiser Permanente 

California based Kaiser Permanente is an integrated managed care conglomerate. It is the largest managed care organization in the U.S. Industrialist Henry J Kaiser and physician Sidney Garfield had together established the company in 1945. The Kaiser Foundation Health Plan and its regional operating subsidiaries; Kaiser Foundation Hospitals; and the autonomous regional Permanente Medical Groups are the three major divisions of the company. It is a $47.9 billion revenue generated company. It earned an index score of 4.300 out of 5.

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