How Much Does A Private ADHD Diagnosis Cost? If you are an adult who suffers from ADHD you may have to take the private route to be diagnosed. This is a good option since many private psychiatrists have experience in diagnosing ADHD in adults. They also look for co-morbidities, such http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1558458