How Much Does An ADHD Private Diagnosis Cost in the UK? The NHS is flooded with patients looking for an ADHD diagnosis and waiting times are lengthy. Some private health insurance companies will cover the cost of an assessment. The exact number of patients waiting to receive an appointment is https://telegra.ph/Watch-Out-How-ADHD-Diagnosis-Private-UK-Is-Taking-Over-And-How-To-Stop-It-03-06