The diagnosis of a psychological disorder is a very intensive process. When emotions or behaviors interfere with educational progress, the school and parents evaluate whether this warrants an individual education plan (IEP). Children's records are confidential and may be released with a parent signature before age 18 or with the student's signature after age 18.
In some cases, a child may qualify early in schooling but later no longer continues to qualify.
The military and law enforcement, for example, screen for these issues, so it is possible that your child would not be accepted under certain criteria.