Second opinion programs.
D054598:Blue Cross Blue Shield Insurance Plans; D006801:Humans; D007348:Insurance, Health; D007349:Insurance, Health, Reimbursement; D008484:Medicaid; D006278:Medicare; D011366:Professional Review Organizations; D012017:Referral and Consultation / Q000191:economics*; D013514:Surgical Procedures, Operative; D014481:United States; D014483:United States Dept. of Health and Human Services