The nursing profession continues to struggle to find the most appropriate approach to credentialing Advanced Practice Registered Nurses (APRNs). One early step in addressing this struggle is determining the incidence of APRN disciplinary actions by boards of nursing. This article presents data from 2003 and 2004 describing the incidence of APRN disciplinary actions by United States boards of nursing. Fifty-one boards of nursing, all members of the National Council of State Boards of Nursing, were asked to report the numbers of APRN discipline cases for 2003 and 2004 which had been resolved, using a tool that differentiated disciplinary cases into four data categories: chemical impairment, exceeding scope of practice, unprofessional conduct, and safety or abuse of patients. Thirty-eight (74.5%) of 51 boards of nursing reported discipline data for a total of 125,882 APRNs showing 688 disciplinary actions were taken during 2003 and 2004. This indicates that APRNs experience a low incidence of discipline related to chemical impairment, exceeding scope of practice, unprofessional conduct, and safety or abuse of patients.