Adult ADHD Assessment in the UK: NHS vs Private, Costs, Waiting Times and What to Expect

Have you spent years struggling with concentration, organisation, procrastination or feeling overwhelmed by everyday responsibilities? Perhaps you've always wondered whether you might have attention deficit hyperactivity disorder (ADHD), but have never explored getting an assessment.

For many adults, considering an ADHD assessment can bring a mixture of relief, uncertainty and questions. Where do you start? Should you go through the NHS or choose a private ADHD assessment? How much will it cost, and what happens if you're diagnosed?

Understanding your options can help you make an informed decision about the next steps.

What is ADHD in adults?

Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental condition that affects attention, activity levels, impulse control and executive functioning. Although ADHD is often associated with childhood, its symptoms can continue into adulthood. Some people reach adulthood without ever having been assessed, particularly if their difficulties were overlooked, misunderstood or managed through coping strategies.

Adult ADHD can affect different areas of life, including work, education, relationships, finances and everyday responsibilities.

Common difficulties may include:

• Concentration: Struggling to remain focused, particularly during repetitive or less stimulating tasks.
• Organisation: Finding it difficult to plan, prioritise or manage competing responsibilities.
• Time management: Underestimating how long tasks will take, frequently running late or missing deadlines.
• Procrastination: Knowing what needs to be done but struggling to get started.
• Forgetfulness: Misplacing belongings, forgetting appointments or overlooking important tasks.
• Restlessness: Feeling internally restless, needing stimulation or finding it difficult to relax.
• Impulsivity: Interrupting conversations, making quick decisions or acting without fully considering the consequences.
• Check out our blog on ADHD and decision making if you want to find out more.

Not everyone with ADHD experiences all these difficulties, and symptoms can look very different from one person to another. Importantly, experiencing some of these difficulties does not automatically mean you have ADHD. Anxiety, depression, sleep problems and other conditions can cause similar symptoms, which is why a comprehensive clinical assessment is important.

How do you get an adult ADHD assessment in the UK?

If you think you may have ADHD, there are several routes to assessment. In England, the main options are an NHS referral, an eligible NHS Right to Choose referral or a self-funded private ADHD assessment.

Each pathway has different considerations, including waiting times, funding and arrangements for treatment following diagnosis.

1. NHS ADHD assessment

The usual first step is to arrange an appointment with your GP and explain the difficulties you have been experiencing. Your GP may ask about your symptoms, how long they have been present and how they affect your everyday life. Where appropriate, they can refer you to a specialist adult ADHD service.

NHS assessments are funded through the NHS, but waiting times vary significantly between services and locations.

For some adults, a lengthy wait can be particularly difficult when symptoms are affecting employment, relationships or day-to-day functioning.

2. NHS Right to Choose

In England, eligible patients may be able to request a referral to an alternative NHS-funded provider under the Right to Choose pathway. Some independent organisations provide ADHD assessments through NHS contracts, potentially offering an alternative to the local NHS service.

However, not every private ADHD clinic is a Right to Choose provider, and eligibility, waiting times and treatment arrangements vary.

Before choosing this route, it is important to check what the provider offers, including whether medication initiation, follow-up appointments and ongoing prescribing are available.

3. Private adult ADHD assessment

A private ADHD assessment is another option for adults who would prefer to arrange an assessment directly and pay for it themselves (or using insurance to pay for some of it). Depending on the provider, private assessments may offer greater flexibility in appointment availability and access to specialist clinicians.

Here at Phoenix, we work with several insurance companies, including BUPA, Vitality, and AXA.

However, private assessments are not all the same.

Before booking, you should understand exactly what the assessment includes, who will conduct it, what happens after diagnosis and whether there are additional costs for medication or follow-up appointments.

4. NHS vs private ADHD assessment: what's the difference?

Aside from who pays, the most important factor is the quality and thoroughness of the assessment, not simply how quickly an appointment is available. A private ADHD diagnosis should be based on an appropriate specialist assessment, using recognised clinical standards.

What happens during an adult ADHD assessment?

An ADHD assessment is much more than completing a questionnaire or discussing concentration difficulties. Under NICE guidance, diagnosis should be made by an appropriately qualified healthcare professional with specialist training and expertise in ADHD.

A comprehensive assessment explores your symptoms, developmental history, mental health and the impact of your difficulties across different areas of life.

Before the appointment

You may be asked to complete questionnaires and provide information about:

• Your current symptoms and everyday difficulties.
• Your childhood and educational history.
• Your medical and mental health history.
• Previous assessments or treatments.
• How your symptoms affect work, relationships and home life.

Where appropriate, information from someone who knows you well may also help the clinician understand your experiences.

During the assessment

Your clinician will explore your symptoms in detail and consider whether they meet the diagnostic criteria for ADHD. This typically includes discussing whether symptoms were present during childhood, how they have developed over time and whether they affect more than one area of your life.

The clinician will also consider other possible explanations for your symptoms and whether other conditions may be present alongside ADHD.

• Check out our blog on ADHD and common coexisting conditions

Are questionnaires or computerised ADHD tests enough?

No. Questionnaires and computerised attention tests can provide useful additional information, but they cannot diagnose ADHD on their own.

A diagnosis requires a comprehensive clinical assessment.

At Phoenix Mental Health Services, our adult ADHD assessment pathway includes clinical assessment and supporting assessment tools, including QbCheck, where appropriate.

How much does a private ADHD assessment cost in the UK?

Private ADHD assessment prices vary between providers, depending on what is included. Some clinics advertise an initial assessment price but charge separately for diagnostic reports, follow-up appointments, medication initiation or ongoing prescribing.

When comparing providers, it is helpful to ask:

• Does the price include the full diagnostic assessment and written report?
• Who will conduct the assessment?
• Are additional questionnaires or tests included?
• What happens if ADHD is not diagnosed?
• Is a medication consultation included, where clinically appropriate?
• What are the costs of medication reviews, prescriptions and follow-up care?
• What happens if my GP does not agree to shared care?

Private ADHD assessments at Phoenix Mental Health Services

At Phoenix Mental Health Services, our adult ADHD assessment is £1,395 (£1435 in 2027).

Split the cost payment options are available. To learn more about ways to pay, you can contact our team or check out our ways to pay page.

The assessment package includes a comprehensive clinical assessment, QbCheck, a diagnostic outcome where clinically appropriate, an initial prescription if indicated and a complimentary ADHD coaching session.

A diagnosis or prescription is not guaranteed. Any diagnosis and treatment recommendation will depend on the clinician's assessment and your individual circumstances.

We encourage patients to understand the full assessment pathway and any potential ongoing treatment costs before booking.

What happens if you're diagnosed with ADHD?

Receiving an ADHD diagnosis can help explain difficulties that may have affected different areas of your life for many years. For some adults, a diagnosis provides a clearer understanding of their experiences and helps them identify appropriate support.

However, diagnosis is not the end of the process.

Your clinician should discuss the findings, explain any recommendations and help you understand the treatment and support options available. These may include medication, psychological support, ADHD coaching, practical strategies and adjustments at work or in education.

Not everyone with ADHD needs or wants medication. Treatment should be individualised according to clinical needs and personal preferences.

Can you get ADHD medication after a private diagnosis?

Yes, where clinically appropriate, medication may be offered following a private ADHD assessment. However, medication is not automatically prescribed simply because someone receives a diagnosis.

Before starting ADHD medication, a suitably qualified prescriber needs to consider your medical history, current medication, mental health, blood pressure, pulse and other relevant physical health information.

If medication is recommended, follow-up appointments are usually needed to monitor effectiveness, side effects and dosage adjustments.

Will your NHS GP prescribe medication after a private diagnosis?

Not necessarily. Some patients hope to transfer prescribing to their NHS GP through a shared care agreement once their medication has been stabilised.

However, a GP is not automatically required to accept shared care following a private diagnosis.

Acceptance depends on the GP, local arrangements, clinical suitability and whether the relevant shared care requirements can be met.

If your GP does not accept shared care, you may need to continue receiving prescriptions and medication reviews through your specialist provider, potentially at additional cost.

This is an important consideration when budgeting for a private ADHD assessment.

What if you're assessed but don't receive an ADHD diagnosis?

An ADHD assessment does not always result in a diagnosis. Sometimes symptoms are better explained by another condition, or the available evidence does not meet the diagnostic criteria for ADHD.

This does not mean that your difficulties are not genuine.

A thorough assessment can still provide valuable insight into your symptoms and help identify appropriate next steps, whether these involve further assessment, psychological support or other treatment.

The purpose of an ADHD assessment is to understand your difficulties accurately, rather than simply confirm a suspected diagnosis.

Is a private ADHD assessment worth it?

The answer depends on your circumstances, priorities and financial situation.

For some adults, accessing an assessment sooner may be particularly valuable when difficulties are significantly affecting their work, education, relationships or wellbeing. Others may prefer to pursue an NHS-funded pathway, particularly when the cost of private assessment and ongoing treatment would be difficult to manage.

Before making a decision, consider the quality of the assessment, the experience of the clinician, the full cost of treatment and the support available afterwards.

Choosing an assessment provider should be about finding a clinically appropriate and sustainable pathway for your needs.

Considering your options for an ADHD assessment? Get in touch with our team today to discuss an ADHD Assessment with Phoenix Mental Health Services.

Taking the next step towards understanding ADHD

If you've been struggling with symptoms that may be related to ADHD, seeking an assessment can be an important step towards understanding your experiences and exploring appropriate support.

Whether you choose an NHS pathway or a private ADHD assessment, the priority should be receiving a thorough, evidence-based evaluation from an appropriately qualified specialist.

At Phoenix Mental Health Services, we provide adult ADHD assessments and ongoing support tailored to individual clinical needs.

If you would like to learn more about our assessment process, what's included or the next steps, our team can help you understand your options before making a decision.

Learn more about our Adult ADHD Assessment service, start by completing our free prescreening.

References

• NHS – ADHD in adults: https://www.nhs.uk/conditions/adhd-adults/
• NICE – Attention deficit hyperactivity disorder: diagnosis and management (NG87): https://www.nice.org.uk/guidance/ng87
• NHS – Your choices in the NHS: https://www.nhs.uk/using-the-nhs/about-the-nhs/your-choices-in-the-nhs/