I have always been under the impression that one doctor cannot bill under another doctor’s NPI except under a true Locum Tenens situation. But a friend who works in another derm practice says that her doctor brings in a Mohs surgeon once a week and bills insurance under his own name for the Mohs surgeon’s work. When my friend told him he is not allowed to do this, he replied that he has checked into this and found that it is permitted.

Is there something I don’t know here, or is he committing fraud?