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 good alternative, since many private psychiatrists have experience in diagnosing ADHD in adults. They will also test for co-morbidities such as anxiety https://telegra.ph/What-Freud-Can-Teach-Us-About-Private-ADHD-Diagnosis-UK-03-07