You may wish to check with American Medical Association website to see ascertain whether the charges are reasonable.
http://www.ama-assn.org/
If you have evidence that they have you may right to the doctor to claim the refund.
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Circumnavigator, lawyer and columnist and the man who divides his time between Singapore, Hong Kong and China. I believes that etiquette transcends nationality and race. 
In this column I will offer stylish advice to everyday questions on etiquette at work and at home and anything else that may be bothering you.