Thank you also, JMJ11, for your reply. You are exactly right; we are billing un credentialed providers (MDs) under a credentialed provider's name. That's a great article but I was hoping for some information for commercial carriers. I think in the industry it's very well known not to fool around when it comes to Medicare, but my boss has this attitude that it's more grey when it comes to private sector insurance. He's made vague references to phone calls with insurance reps telling him it's ok, or said something along the lines of "if the supervising physician is within a 60 minute drive they