I think if you already have a medical diagnosis of ADHD there is no need for an eval by the school and you can go right to getting the 504. I know with my DS he had a hypotonia diagnosis by private neurologist, private neuromuscular and resulting delays in private OT reports and we got a 504 on that without the school doing any type of eval. They did do their own evals (OT and PT for getting school OT and/or PT services) but we had a 504 based on the DX and regardless of what the school OT or PT found.
