What the wait actually looks like
There is no single national NHS adult ADHD waiting time. Local services in England are commissioned by individual ICBs and vary from roughly 12 months to more than 5 years. Backlogs grew rapidly post-2020 as adult ADHD recognition rose; many services have a published "new referrals paused" or "waitlist closed" status at various points.
NICE's adult ADHD guideline NG87 sets the clinical standard — but doesn't set waiting time targets the way the NHS Constitution 18-week target does. In practice the 18-week target is breached for most adult ADHD assessments.
Right to Choose can shorten it
Right to Choose is your legal right in England to pick your NHS-funded provider for most first outpatient appointments — including adult ADHD assessment. Several NHS-commissioned providers publish substantially shorter waits than many local services. Full walkthrough in our Right to Choose for ADHD guide.
Don't get removed from the list
- Tell the service in writing when you move house or change contact details.
- If you're sent an appointment, respond — even to decline. Silence is the most common reason for removal.
- Reasonable adjustments (text appointments instead of calls, longer notice, etc.) are allowed — ask.
- Ask once a year for confirmation you're still on the list and your current position.
What to do while you wait
- Ask your GP to add a clinical note that you've been referred for adult ADHD assessment — useful for sick-note continuity and shared care later.
- Request reasonable adjustments at work under the Equality Act 2010. A referral letter is enough evidence to start the conversation; a formal diagnosis isn't required.
- If you're studying, contact your university's disability service — many will support you on a referral letter alone.
- Keep a symptom diary — it speeds the assessment when your slot comes up.
Private and shared-care routes
A private adult ADHD assessment by a qualified specialist produces a valid diagnosis. Whether your NHS GP will then take over prescribing under shared care varies — some practices have a blanket policy of refusing post-private shared care, others accept on a case-by-case basis. Ask your practice before paying for assessment if continued NHS prescription matters to you.
If the wait is unmanageable and Right to Choose isn't fixing it, a formal NICE NG87-cited letter to your GP — asking for the referral status, the waiting time, and any interim support — is the single most effective lever to keep things moving. Finally Seen writes that letter for £49.
Frequently asked questions
›How long is the average NHS ADHD wait?
It varies enormously by area. Many local NHS adult ADHD services in England now have multi-year waits — sometimes 5 years or more. Right to Choose providers commonly publish shorter waits (months to ~2 years), though demand is rising across both.
›Can I be removed from the waiting list?
You can be removed for missing two appointments, declining a reasonable offer, or moving out of area. You should always be told in writing before being removed.
›Will my GP prescribe before assessment?
Generally no. NHS ADHD medication initiation requires specialist diagnosis and titration (NICE NG87). Some GPs may bridge in exceptional shared-care circumstances, but routine prescribing pre-diagnosis isn't typical.
›Should I go private and then return to the NHS?
Many do. A private diagnosis is valid; whether the NHS GP takes over prescribing via shared care after private titration is at the GP's discretion and varies across England.