How Much Does A Private ADHD Diagnosis Cost? You might have to take the private route if you are an adult with ADHD. This is a good alternative, since many private psychiatrists have experience in diagnosing ADHD in adults. They also look for co-morbidities such as anxiety and depression, which http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1557914