How Much Does An ADHD Private Diagnosis Cost in the UK? The NHS is overflowing with people who want to be diagnosed with ADHD and the waiting times are lengthy. However, certain private health insurance companies will pay for an assessment. The exact number of patients waiting for an appointment https://telegra.ph/The-Reason-You-Shouldnt-Think-About-Enhancing-Your-Private-Adult-ADHD-Assessment-03-07