NHS vs Private ADHD Diagnosis

If you think you might have ADHD, one of the first decisions you will face is whether to pursue assessment through the NHS or privately. Both routes can lead to a valid diagnosis, but they differ significantly in cost, waiting times, and what happens afterwards.

This guide sets out the key differences to help you make an informed choice. There is no single right answer — the best option depends on your circumstances, finances, and how urgently you need support.

Overview: the two routes compared

Before going into detail, here is a summary of the main differences between NHS and private ADHD assessment.

NHS assessment is free at the point of use. You will typically be referred by your GP to a local specialist service. Waiting times vary enormously by area but often range from 1 to 5 years for adults. Once assessed, ongoing prescribing and monitoring is managed through the NHS.

Private assessment involves paying out of pocket, usually between £500 and £1,500 for an adult assessment. You can often be seen within weeks or a few months. However, getting your GP to take over prescribing afterwards (a “shared care” arrangement) is not guaranteed and can be a significant challenge.

Getting referred

NHS route

The process starts with your GP. You will need to explain why you think you might have ADHD and ask for a referral to your local ADHD assessment service. Some GPs are knowledgeable about ADHD; others may be less familiar with adult presentations.

It can help to bring specific examples of how ADHD-like difficulties affect your daily life, such as problems with organisation, time management, attention, impulsivity, or emotional regulation. If you have school reports or previous assessments, these can support your case.

Your GP may carry out an initial screening using a tool like the ASRS (Adult ADHD Self-Report Scale) before making the referral. In some areas, there is a formal screening step before you are placed on the assessment waiting list.

In England, you also have the Right to Choose your assessment provider, which may give you access to a service with shorter waiting times.

Private route

You can self-refer to most private ADHD assessment services without needing a GP referral, though some will ask for a GP letter or your medical records.

When choosing a private assessor, look for a clinician who is a psychiatrist or clinical psychologist with specific experience in ADHD. Check that they are registered with the appropriate professional body (GMC for psychiatrists, HCPC for psychologists) and that they use recognised diagnostic criteria (DSM-5 or ICD-11).

It is also worth checking whether the private provider follows NICE guidelines for ADHD assessment, as this makes it more likely that NHS services will accept the diagnosis for ongoing care.

Cost comparison

NHS

Assessment and diagnosis through the NHS is free. If you are prescribed ADHD medication, you will pay the standard NHS prescription charge (currently £9.90 per item in England, though many people qualify for exemptions or prepayment certificates). Prescriptions are free in Scotland, Wales, and Northern Ireland.

Private

Private ADHD assessment typically costs between £500 and £1,500 for adults, depending on the provider and the complexity of the assessment. Some providers offer a single-session assessment; others spread it across two or more appointments.

If you are diagnosed and started on medication privately, ongoing prescribing costs can be significant. Private prescriptions for ADHD medication may cost £100–£300 per month, plus regular review appointments at £150–£300 each. This is why many people hope to transfer to NHS shared care after a private diagnosis.

Some providers offer package deals that include a set number of follow-up appointments and titration sessions. It is worth understanding the full likely cost before committing, not just the assessment fee.

The assessment process

What to expect

Whether NHS or private, a good ADHD assessment should follow NICE guidelines and include a detailed developmental history (your childhood experiences, school, and early life), assessment of current symptoms across multiple settings such as work, relationships, and daily life, consideration of other conditions that might explain your symptoms, and ideally, corroborative information from someone who knew you as a child, such as a parent or sibling.

The assessment may also include standardised questionnaires, cognitive tests, and a review of your mental health history.

How they differ

NHS assessments tend to be thorough and multi-disciplinary. You may be seen by a psychiatrist, psychologist, or specialist nurse, sometimes across multiple appointments. The process can feel slow but is generally comprehensive.

Private assessments vary more in format. Some are thorough and follow the same approach as NHS services. Others are shorter and more streamlined, which can be efficient but may occasionally feel less comprehensive. A very short assessment (under an hour) with limited history-taking should be viewed with some caution.

The quality of assessment depends more on the individual clinician than on whether it is NHS or private. Both routes can produce excellent or poor assessments.

After diagnosis: medication and shared care

This is where the NHS vs private distinction becomes most practically important.

Diagnosed through the NHS

If you are diagnosed through the NHS, your ongoing care is straightforward. The same service (or your GP, with specialist guidance) will manage your medication, including the initial titration period where the right medication and dose are found.

Diagnosed privately

If you are diagnosed privately and want NHS prescribing, you will need a shared care agreement. This is an arrangement where the private specialist provides clinical guidance and your GP takes over the routine prescribing and monitoring.

Shared care is not guaranteed. Some GPs and ICBs are reluctant to enter shared care arrangements for privately diagnosed ADHD, for various reasons including cost pressures, lack of local guidance, or concerns about the quality of the private assessment.

If your GP declines shared care, your options include continuing to pay for private prescriptions (which can be expensive long-term), asking to be re-referred to the NHS for confirmation of your diagnosis, raising a formal complaint or contacting your ICB, or asking the private provider to write to your GP with a clear shared care request following NICE guidelines.

The BMA and RCGP guidance states that GPs should not automatically refuse shared care requests, but in practice, experiences vary.

Quality and recognition

A common concern is whether a private diagnosis will be “accepted” by the NHS. In principle, a diagnosis from a qualified clinician using recognised criteria should be accepted regardless of whether it was obtained publicly or privately. In practice, some NHS services may want to review or confirm a private diagnosis before taking over care.

Factors that make a private diagnosis more likely to be accepted include the assessor being a consultant psychiatrist (rather than a non-medical professional), the assessment report being detailed and clearly evidenced, NICE guidelines being followed throughout, and corroborative evidence being included in the report.

If you are concerned about acceptance, ask the private provider before your assessment whether they have experience of NHS services accepting their diagnoses, and whether they provide shared care letters to GPs.

Making your decision

There is no universally right answer. Here are some things to consider.

The NHS route may suit you better if you are able to wait for assessment without significant harm to your daily life, finances are a concern, you want straightforward ongoing NHS care without the complexity of shared care, or you are in an area with relatively short waiting times or have used Right to Choose.

The private route may suit you better if you are struggling significantly and need answers sooner, you can afford the assessment and potentially several months of private prescriptions, you have researched providers carefully and are confident in their quality, or your employer or insurance will cover the cost.

A combined approach is also possible. Some people start on the NHS waiting list and pursue a private assessment in parallel, keeping the NHS referral as a backup in case shared care proves difficult.

Questions to ask a private provider

Before booking a private assessment, consider asking these questions. Who will carry out the assessment, and what are their qualifications? How long is the assessment, and what does it include? Do you follow NICE guidelines for ADHD assessment? What happens if I am not diagnosed with ADHD? Do you provide shared care letters to GPs? What is the total cost, including any follow-up appointments? What are the ongoing costs if I need medication titration?

Getting support from neurobetter

Navigating the choice between NHS and private assessment can feel overwhelming, especially when you are already dealing with the difficulties that prompted you to seek assessment in the first place.

Our ADHD section has more information about ADHD, including pages on waiting times, women and late diagnosis, and ADHD and menopause. Our community connects you with others who have been through the assessment process and can share their experiences.

This page was last reviewed in March 2026. neurobetter does not provide medical advice. The information here is intended to help you make informed decisions about your care. For personalised medical advice, please speak to your GP or a qualified clinician.