How Much Does A Private ADHD Diagnosis Cost? You might have to take the private option if you are an adult who suffers from ADHD. This is a great alternative, since many private psychiatrists have experience in diagnosing ADHD in adults. They will also screen for co-morbidities such as depression https://telegra.ph/Ask-Me-Anything-10-Answers-To-Your-Questions-About-Private-ADHD-Diagnosis-UK-Cost-03-07