How Much Does A Private ADHD Diagnosis Cost? If you are an adult with ADHD you may have to pursue a private path to be diagnosed. This is a great alternative, since many private psychiatrists have experience in diagnosing ADHD in adults. They will also screen them for co-morbidities like http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1558517