I'm totally open to this being a diagnosis. But I think the point is more that a kid with a foot infection who refuses demands would probably be called "independent". Stubborn, even. But it wouldn't necessarily be medicalized.

There was a recent study on ADHD and birthdates; the upshot was that kids on the younger end of the age spectrum are medicated for ADHD more if they're young for their grade. Which implies that some number of kids are medicated more for "teacher inconvenience syndrome" than any real disease.

There's a long history of medicine treating different as bad. (The formal academic term is "medicalization of deviance".) So I think it's worth being a bit skeptical that traits that teachers and parents might inconvenient are diseases on the order of foot infections. Rather than, say, how homosexuality was medicalized for decades.