So if a physician leaves a group practice, what do they need to do as far as notifications? Do you need to call every insurace company and let them know that you have left the practice and change your address with them? Do you have to call Medicare and Medicaid and let them know that you have left? What if you do not have a new business/practice location address yet and still between jobs? Do you still call ALL the insurance companies and tell them you left? Do you call the NPI center and tell then you left too? Thank You.