How Much Is A Private ADHD Assessment? If you'd like to cut down on the time it takes to get an ADHD assessment You can do this by opting to pay privately. This is referred to as Your Right to Choose and is accessible to all registered GPs in England. https://telegra.ph/14-Smart-Strategies-To-Spend-Leftover-Private-Diagnosis-Of-ADHD-Budget-03-06