In my former teaching position, one of my responsibilities was as a case manager for the 504 students. At least in our state, if your child has a documented medical diagnosis (i.e. ADHD) and needs accommodations to succeed in school, he cannot be denied a 504. It is illegal for a school to say no to a 504 plan if you have written verification by a licensed medical practitioner documenting your child’s diagnosis and need for accommodations. Perhaps this varies by state? If it happened here, you would have grounds for a lawsuit.