I'm asking this for my friend (he is too lazy to make a post). He just graduated, got his Georgia Dental License and NPI number. He is in the process of applying for a medicaid number. While he is waiting 6 weeks for this number to be issued is it illegal for him to practice and use another providers medicaid number to bill with. For instance he will do exams and it will be coded with the other dentist's medicaid number. The practice is 100% medicaid. Thanks!