At a glance
- Most autism diagnoses begin with a GP appointment
- GPs can refer to a specialist autism assessment service if appropriate
- NHS waiting times can range from 12 months to several years depending on area
- Right to Choose may allow access to alternative NHS-funded providers
- Private autism assessments are an option but come with cost trade-offs
The NHS autism assessment landscape is in active change. The 2026/27 NHS Payment Scheme introduced ICB-level caps that may affect Right to Choose capacity. NHS England's transition to the Department of Health and Social Care by around 2027 may further reshape commissioning. ICBs are also being reduced from 42 to 26 through 2025-26. Always check local NHS guidance and the eligibility checker for the most current information.
Many adults and parents in the UK wonder how to start the process of getting an autism diagnosis. Whether you are seeking an assessment for yourself or for a child, the pathway can feel confusing.
This guide explains how autism diagnosis works in England, including NHS referral pathways, waiting times, and alternative options such as Right to Choose and private assessments.
Step 1: Speak to your GP
For most adults seeking an autism diagnosis, the process begins with a GP appointment.
During this appointment, you can discuss the traits or challenges that have led you to consider whether an autism assessment might be appropriate.
Your GP may ask questions about:
- communication and social interaction
- sensory sensitivities
- childhood development
- daily functioning
If your GP believes an assessment is appropriate, they can refer you to a specialist autism assessment service.
Your GP is typically the first point of contact for an autism diagnosis in England. They will assess whether a referral to a specialist service is clinically appropriate based on your symptoms and circumstances.
Step 2: Referral to an autism assessment service
After referral, patients are typically placed on a waiting list for a specialist autism assessment team.
These services are usually delivered by multidisciplinary teams that may include psychiatrists, psychologists, and speech and language therapists.
Autism assessments often involve several stages, including clinical interviews, developmental history, and structured diagnostic tools.
NHS autism assessments are expected to follow NICE clinical guidelines (CG128 for adults, CG170 for children and young people). If you are considering a private assessment, you may wish to check that the provider follows these recognised diagnostic standards.
Step 3: Waiting for an assessment
Unfortunately, NHS autism diagnosis waiting times can be long.
In some areas, patients may wait one to three years or longer for an assessment due to high demand and limited specialist capacity.
Waiting times for NHS autism assessments in England typically range from 12 to 36 months or longer, depending on local service capacity and demand. Some Integrated Care Boards report waiting lists exceeding three years. These figures are approximate and based on data reported by NHS trusts and Integrated Care Boards — there is no single centrally published national dataset, and actual waits vary significantly by area.
Current NHS autism assessment waiting times across England.
Step 4: Right to Choose options
Under the NHS Constitution, patients in England referred for their first outpatient appointment have the legal right to choose their provider. This includes autism assessments. However, your GP must first agree that a referral for an autism assessment is clinically appropriate.
If your GP does refer you, you can request referral to a provider that accepts NHS Right to Choose referrals. These assessments are funded by the NHS.
Check your Right to Choose eligibility
Not sure whether you qualify for Right to Choose? Use our free eligibility checker to find out in under 60 seconds.
Check eligibilityStep 5: Private autism assessments
Some patients choose private autism assessments if NHS waiting lists are very long.
Private assessments allow patients to book directly with providers and typically involve shorter waiting times.
However, private assessments usually involve paying directly for the evaluation.
Private autism assessment costs in the UK commonly range from around £1,500 to £3,000, though fees may be higher depending on the provider, the complexity of the assessment, and whether the assessment is for an adult or a child. Waiting times are typically 2 to 12 weeks, but they require upfront payment.
Compare private and NHS autism diagnosis options, costs, and timelines.
Adult vs child autism diagnosis
Autism diagnosis pathways can differ depending on whether the assessment is for an adult or a child.
Adult autism assessments are often delivered through specialist neurodevelopmental services, while children are usually assessed through paediatric services or Child and Adolescent Mental Health Services (CAMHS).
Waiting times and service capacity can vary significantly between adult and child pathways, with adult services historically being under-resourced in many areas.
Compare autism assessment providers
If you are exploring autism assessment options, it can be helpful to understand the different referral pathways and providers available.
Explore autism assessment providers
Find Care Compare helps patients explore NHS and private autism assessment providers. You can:
- Browse providers accepting Right to Choose referrals
- Compare waiting times and assessment formats
- Understand what each provider offers
Frequently asked questions
Sources
This article summarises publicly available information from:
Sources referenced include:
- NHS England — autism assessment guidance
- NICE CG128 — autism in adults guideline
- NICE CG170 — autism in under 19s guideline
- NHS England — Choice Framework
- National Autistic Society — autism diagnosis resources
- Department of Health and Social Care — autism strategy
Related guides
Private vs NHS autism diagnosis
Compare private and NHS autism diagnosis options, costs, and timelines.
Read guide GuideAutism Right to Choose explained
How Right to Choose works for autism assessments in England, who's eligible, and how to request a referral.
Read guide GuideAutism diagnosis waiting times
Current NHS autism assessment waiting times across England.
Read guide GuideAdult autism assessment in the UK
What to expect from an adult autism assessment in the UK.
Read guide