The Health Insurance Association of American (HIAA) offers self-study courses in health insurance and managed care. They have 10 courses leading up to two professional designations: Health Insurance Associate (HIA) and Managed Healthcare Professional (MHP). I purchased some of their books and study guides earlier this year for my daughter who was supervising a hospital accounts payable department. She found the books very helpful.
HIAA's Web site is at
www.hiaa.org. Click on the link for Insurance Education.
Good luck!