England's Two-Year Waits for ADHD and Autism Assessments Explained
NHS boards in England have imposed minimum two-year waits for ADHD and autism assessments.
Nearly one million people are on ADHD waiting lists and about 295,000 await an autism assessment, according to data reported on 25 September 2026 The Guardian. The average wait for an ADHD assessment is 64 weeks, more than a year. Capacity has not kept pace.
Annual incidence (the number of new diagnoses in a year) in people aged 3 to 25 rose between 2020 and 2022. In males it rose from 185 to 580 per 100,000. In females it rose from 45 to 320 per 100,000 The Guardian. Rising awareness has strained assessment services, contributing to the two-year waits. The system is like a waiting room that has not grown while the line outside keeps lengthening.
The pressure predates these figures. Thirteen times more people were waiting for an autism assessment in September 2025 than in April 2019, in a comparison published alongside the UK government review into mental health, autism and ADHD services GOV.UK. The government launched that review to examine provision across those pathways.
Delivery is split between NHS and independent provision. NHS England funds private assessments through its 'right to choose' pathway — a route that lets patients pick an approved provider — but can reject those diagnoses The Guardian. Clinical boundaries are complex because presentations can overlap. Duke University researchers found up to half of people diagnosed as autistic also show ADHD symptoms The Guardian. Research on waiting times found that for adults, an autism diagnosis was linked to shorter waits while an ADHD diagnosis was linked to longer waits.
Policy attention is now on Peter Fonagy, who authored a government-commissioned interim report on ADHD and autism trends published earlier in 2026. As of 25 September 2026, he was expected to deliver his final report in the next few weeks.
The broader context here is triage under sustained demand growth rather than a short-term backlog. Two-year minimum waits function as explicit rationing, shaping who remains in NHS queues, who seeks assessment through 'right to choose', and how commissioners manage uncertainty when symptoms overlap. Uneven waits raise questions about referral criteria, assessment duration, and post-diagnostic provision that the final report will need to address, and whether capacity, private-sector use, and diagnostic standards can align without extending delays.
