I'm curious about what you mean by "ADD specialist." Are you referring to a neuropsychologist or psychopharmacologist or psychiatrist? The guy I saw is a neuropsych who specializes in ADD testing, whom I saw through a referral from my primary care doc. The actual referral was from my C, but in order to get insurance coverage for testing I had to go through the PCP's office. If I want to try meds I need to get that through the PCP.
