Real dentists should be sending claims to many different insurance companies. Because your company only represents a few of these companies,the sequential numbers on the claim sheets from a given dentist will rotate through all the companies that dentist is working with. If the numbers sent to you from a given dentist are sequential, you know that the dentist is only sending claims to you. Search the claims file for sequential numbers from any given dental office. Are any sending you sequential claims? And how many?