By the way - a 504 is to cover accommodations for a MEDICAL diagnosis. The child's grades should not be a factor in the matter.
Just because a kid with terrible asthma is getting A's, doesn't mean they don't need a 504 for accommodations regarding physical activity. Just because a kid with PTSD gets A's doesn't mean they don't require accommodations. Same for ADHD! If you want a 504 you need to submit a request, in writing, asking for an evaluation.
Personally, I would want to go into the ARD meeting (or whatever they call the acceptance meeting where you live) with paperwork in-hand from a private neuropsych or psychologist.
A great many school administrators and special ed specialists, however, DO in fact think that this is so. It's
maddening that they don't see it as discriminatory that such children are not getting the same basic access with dignity that their peers do. But a great many school officials we've run into over the years don't see the problem if there "isn't a learning deficit."

I'm pretty sure that none of them would
actually think that a mobility-challenged child should have to "just watch" the other kids during PE, or drag him/herself up the stairs to the (non-accessible) restrooms. But at the same time, they may really not see how exclusion or embarrassment of children for
other disabilities is just as wrong.
To them, I say, meet
Lillie. (Lillie-Felton, I mean.

)