How long is the NHS waiting list for an ADHD assessment?

Most children wait one to four years for an NHS ADHD assessment as of 2026, and longer in some areas — there is no national maximum-wait target, and two-thirds of children referred had waited over a year. The honest version of the answer is that nobody can give you one clean number. NHS England does not publish a true waiting-list figure for an ADHD assessment, and no rule sets a guaranteed maximum wait. What exists is experimental data, a known undercount, and waits that swing wildly depending on where you live.

Where the scary headline number comes from

You will see a single huge figure quoted as if it were a precise queue. The latest one is up to 683,088 open referrals at the end of March 2026, from NHS England Digital’s ADHD Management Information for England (the May 2026 release). It counts referrals that may be for an ADHD assessment — adults and children together — not a confirmed children’s waiting list. NHS England itself calls this experimental management information and warns it is likely an undercount with patchy data quality.

Treat the number with care: it is not comparable month to month. The count actually fell from a peak of 735,157 at the end of December 2025 to 683,088 three months later — not because waits got shorter, but because of changes in how providers report. A falling headline figure here does not mean a falling queue.

What the data does tell you about how long children wait, from the December 2025 breakdown (the latest with a waiting-time split):

• About two-thirds (65.8%) of children referred had been waiting over a year.
• Only around 9% had been waiting under 13 weeks.
• Roughly 29% of open referrals were for children and young people aged 0 to 17.

So the typical experience for a child is a wait measured in years, not weeks. The independent ADHD Taskforce, summarised by NHS England in 2025, found some people wait more than two years, and that in a few areas waits have grown to 10 to 15 years. That is the postcode lottery: months in some places, the best part of a childhood in others.

Why there is no maximum-wait target

The 18-week referral-to-treatment standard you may have heard about applies to consultant-led hospital care. It does not cover community or CAMHS (Child and Adolescent Mental Health Services) neurodevelopmental assessments like ADHD. NICE guidance (NG87) sets out how ADHD should be diagnosed and managed, but it does not impose a binding waiting-time limit. In plain terms: there is no legal deadline the NHS has to meet for your child’s ADHD assessment, which is exactly why the waits have been allowed to grow so far.

Right to Choose can be faster, but not everywhere

Right to Choose is your legal right to pick which NHS-funded provider does your child’s first assessment, and it has been a way to skip the longest local queues. Where it is available, a child ADHD assessment through Right to Choose typically takes around 12 to 18 months — quicker than many CAMHS lists, though still far from quick. The catch is that it is no longer a reliable shortcut everywhere. As of May 2026 several Integrated Care Boards (the local NHS bodies that fund this) cannot offer new booking dates and are holding referrals pending funding, including Greater Manchester, Leicester, Leicestershire and Rutland, and Somerset. Check your own area’s position before you count on it.

This page is general information, not clinical or legal advice.