National Nurse Act of 2019 This bill requires the Department of Health and Human Services to designate the Chief Nurse Officer of the Public Health Service as the National Nurse for Public Health. The position includes the authority to (1) provide leadership and coordination of Public Health Service nursing professional affairs for the Office of the Surgeon General and other agencies of the Public Health Service, (2) conduct outreach and education, and (3) provide guidance and leadership for activities that will increase public safety and emergency preparedness. The National Nurse for Public Health must (1) participate in identification of national health priorities, (2) encourage volunteerism of nurses and strengthen the relationship between government agencies and health-related national organizations, and (3) promote the dissemination of evidence-based practice in educating the public on health promotion and disease prevention activities.