We have a medical diagnosis of gifted aspergers for my DD9 from a pediatric psychologist from Children's Hospital. It has no effect whatsoever on the school district. They do not recognize it or any outside testing that my DD had.
We have fought long and hard to get appropriate testing for pragmatics into the school. (With traditional testing aspie's can pass and actually have a problem, with newer tests specific to actions vs. answers, they don't.) The new tests qualify my DD for an IEP with a speech and language delay in pragmatics and she now receives services. A medical diagnosis, no matter who from, will not in and of itself determine services, and isn't required, in most instances, for services to be granted.
Hope that helps.