ps, if you are going in for 1 expensive test that only looks at adhd, I am not sure I'd go along with that (sometimes if you only look at 1 thing, you find that 1 thing!)
What we had done for our son was called a psycho-educational evaluation. It included iq and assessment tests, screening for mood disorders (anxiety/depression), screening for adhd, screening for learning disabilities. Our dr. has a PhD in Neuropsychology, which is what is best for administering all these tests and assessments...because we were attempting to screen for a learning disability, our insurance did pay for about 1/2 of everything.
The doc gave us a very complete assessment write up, which I think was very helpful in having continuing discussions with the school about ways to accommodate the issues which were identified for our ds9.