I have a HMO which meand he has agrees with my insurence provider the cost of certain treatments. long story short, he charged me an extra $500 for a for something that should have only costed me $240. He charged me a total of $740. I found out later that the $500 charge was for a teatment code D4999 which is a unspecified procedure....UNSPECIFIED. I contaacted me insurence company and wrote a grevience to the dentist board about his overcharge.