As explained in the Anthem Preventive Care Flyer, “Preventive care helps protect you from getting sick. If your doctor recommends you have services even though you have no symptoms, that’s preventive care. Diagnostic care is when you have symptoms and your doctor recommends services to determine what’s causing those symptoms.” So, keep in mind, if your doctor wants to investigate a health issue as a result of your annual physical, you may have to pay out of pocket for those diagnostic services.