How Much Does A Private ADHD Diagnosis Cost? You may need to go the private option if you are an adult suffering from ADHD. This is a fantastic option, as private psychiatrists are skilled in diagnosing ADHD in adults. They will also test for co-morbidities, such as anxiety and depression, http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1556645