Who Can Diagnose ADHD in Australia? Psychologists, Psychiatrists, and GPs Explained

One of the most common questions adults have after an ADHD assessment — or before they book one — is deceptively simple: who is actually qualified to diagnose me?

The answer in Australia is more complicated than it should be. It depends on your state, the type of clinician, whether medication is involved, and how recently the rules in your jurisdiction have changed. The landscape has shifted significantly since late 2024, with several states expanding the role of GPs, and the result is that advice you read even a year ago may already be out of date.

This article explains what psychologists, psychiatrists, and GPs can each do when it comes to ADHD assessment, diagnosis, and prescribing in Australia — and how to tell whether the assessment you had (or are about to have) is thorough enough to trust.

The short answer: diagnosis and prescribing are two different things

This is the distinction that trips most people up, so let's get it clear upfront.

Assessing and Diagnosing ADHD means conducting a comprehensive clinical assessment and reaching a clinical judgement about whether someone meets the diagnostic criteria. In Australia, this can be done by psychiatrists, psychologists, and — increasingly — GPs with specific ADHD training, depending on state rules.

Prescribing ADHD medication is a separate act governed by state and territory controlled substances legislation. Stimulant medications are Schedule 8 controlled substances, which means prescribing authority is tightly regulated. Not everyone who can diagnose ADHD can prescribe for it, and in many jurisdictions, prescribing requires specific approvals or authority arrangements that go beyond the diagnosis itself.

Understanding this split is key to making sense of the rest. A psychologist can conduct a thorough, guideline-standard ADHD assessment — but they can't write you a prescription. A GP might be able to continue your medication — but in some states, they can't initiate it. The rules vary, and they're changing.

What psychiatrists can do

Psychiatrists are medical doctors who have completed specialist training in mental health. In the context of ADHD, they can do everything: assess, diagnose, prescribe, and manage treatment including stimulant medication.

Because they're medical specialists with prescribing authority, psychiatrists have traditionally been the default pathway for adult ADHD diagnosis in Australia — particularly where medication is likely to be part of the treatment plan. They can initiate stimulant medication in every state and territory, and their diagnostic reports carry weight across jurisdictions.

The limitation isn't scope — it's access. 

The RANZCP has about 6,500 qualified psychiatrists (consisting of both Fellows and Affiliates of the College) across ANZ as of 2026, and the profession is in shortage in almost every jurisdiction. Wait times for a private psychiatrist ADHD assessment commonly run three to nine months or longer depending on location, and public adult ADHD services are sparse. A 2026 study found that among psychiatrists who were actually available to book, the average wait was about 16 weeks — and only half of clinicians contacted were taking new patients at all.

The cost is also significant. The same study found that average initial psychiatrist assessment costs were around $1,163, with Medicare rebates covering only a portion.

This is the core reason the system is changing. There simply aren't enough psychiatrists to meet adult ADHD demand, and concentrating all diagnostic and prescribing authority in one profession creates a bottleneck that leaves people waiting months or years for care.

What psychologists can do

Psychologists are trained in psychological assessment and therapy. Many psychologists — particularly clinical psychologists and neuropsychologists — are highly experienced in ADHD assessment and can conduct thorough, DSM-5-aligned diagnostic evaluations.

A psychologist can take a full clinical and developmental history, administer and interpret validated assessment tools, gather and integrate collateral information, assess functional impairment, conduct differential diagnosis, and produce a detailed diagnostic report with a clinical formulation.

What psychologists can't do is prescribe ADHD medication. They're not medical practitioners, so they don't have prescribing authority. If your assessment with a psychologist results in an ADHD diagnosis and medication is recommended, you'll need a medical practitioner — typically a psychiatrist or a trained GP — to handle the prescribing.

This doesn't make a psychologist's diagnosis less valid. The Australian guideline defines ADHD diagnosis as a clinical judgement based on a comprehensive assessment — it doesn't restrict that judgement to a single profession. What matters is whether the assessment was thorough and the clinician was experienced in ADHD, not whether they had "Dr" in front of their name.

A practical note on cost and wait times: The 2026 access study found average psychologist ADHD assessment costs of about $1,622 (often reflecting longer assessment sessions and detailed reporting) with average waits of about 7 weeks among available providers — generally shorter than psychiatry waits but with higher average upfront cost.

What GPs can do — and this is where it gets complicated

This is the area changing fastest, and the rules are genuinely different in every state and territory.

Traditionally, GPs have been the entry point for ADHD care — the person who screens, refers, and coordinates — but not the person who diagnoses or prescribes stimulants. That's shifting. Several states have now expanded the role of specially trained GPs, though the scope varies significantly.

The current state of play

Queensland has gone furthest for adults. Since December 2025, specialist GPs can initiate, modify, and continue psychostimulants for adults with ADHD within dose limits.

South Australia allows specially trained GPs to assess, diagnose, treat, and prescribe for adults from February 2026.

NSW has trained GP continuation prescribing for stable patients since September 2025, with a newer pathway allowing selected GPs to train for diagnosis and initiation from March 2026.

ACT allows trained GPs to continue stimulant prescriptions for stable patients without individual approval since February 2026.

Victoria and Western Australia have announced and are rolling out GP training programs, but implementation is still building.

Tasmania has eased some prescribing rules and committed to broader GP-led reform, including allowing interstate telehealth prescriptions to be dispensed locally.

Northern Territory remains the most specialist-dependent jurisdiction.

What this means in practice

If your GP has completed the relevant ADHD training for your state, they may be able to do significantly more than refer you elsewhere — in some jurisdictions, they can assess, diagnose, and prescribe. If they haven't completed that training, their role is still primarily screening, referral, physical health monitoring, and potentially continuation prescribing under a shared care arrangement with a specialist.

The key question to ask your GP is direct: "Have you completed the ADHD-specific training that applies in our state, and what does that allow you to do?" The answer will tell you whether they can manage your care directly or whether you'll need a referral.

So is my ADHD diagnosis valid?

If you've been diagnosed with ADHD and you're wondering whether that diagnosis is legitimate — whether because a well-meaning friend questioned it, because you're switching providers, or because you're not sure your assessment was thorough enough — here's how to think about it.

The clinician matters less than the process

A diagnosis from a psychologist isn't inherently less valid than one from a psychiatrist. A diagnosis from a trained GP isn't inherently less valid than one from either. What makes a diagnosis trustworthy is whether the assessment process was comprehensive and aligned with the clinical guideline.

The Australian guideline says a proper assessment should include a full clinical and psychosocial history, developmental background including childhood onset, collateral information where available, functional impairment across settings, differential diagnosis and co-occurring conditions reviewed, medical screen, and assessment against DSM-5 criteria. If your assessment covered these areas — regardless of who conducted it — the diagnosis rests on solid ground.

When to question an assessment

The type of clinician is less important than what they actually did. Some things that should make you pause:

• The assessment was very brief — under 30 minutes with no prior information collected.

• No one asked about your childhood or developmental history.

• Collateral wasn't sought or offered.

• Co-occurring conditions like anxiety, depression, trauma, or sleep problems weren't explored.

• You weren't assessed against DSM-5 criteria in any structured way.

• Medication was prescribed without any physical health review.

These gaps can occur with any type of clinician — psychiatrist, psychologist, or GP. The profession on the letterhead doesn't guarantee quality, and the absence of a medical title doesn't indicate a lack of rigour.

When the type of clinician does matter

There is one area where the distinction is practically important: prescribing. If medication is part of your treatment plan, you need a medical practitioner with the appropriate authority in your state to prescribe it. A psychologist's diagnosis is clinically valid, but it doesn't come with a prescription — you'll need a psychiatrist or trained GP to act on the medication component.

This is where collaborative care matters. A good assessment from a psychologist, combined with a prescribing relationship with a GP or psychiatrist who respects that assessment, is a perfectly sound model. Problems arise when the prescriber dismisses the psychologist's work and insists on a full re-assessment for no clear clinical reason — or when there's no communication between the two at all.

The collaborative model: where this is heading

The direction of reform across Australia is clear: GPs are becoming the front door for ADHD assessment and prescribing. For instance, in a growing number of states, specially trained GPs can assess, diagnose, and prescribe for adults — handling the full journey from first appointment through to ongoing medication management.

This makes practical sense. GPs are the most accessible clinicians in the system, they already know your physical health history, and they're set up for the kind of long-term, continuous care that ADHD requires. Concentrating all of that in specialist psychiatry was never sustainable — there simply aren't enough psychiatrists.

Psychiatrists are incredibly helpful where there is substantial complexity — diagnostic uncertainty, severe co-occurring conditions, treatment resistance, or cases where the clinical picture is difficult to untangle. Freeing up psychiatrist time for these cases is better for everyone, including the people who need that specialist depth most.

Psychologists play a different but important role: they're the strongest option when you want to manage your ADHD without medication, or when you need therapeutic support alongside medication. ADHD-adapted CBT, executive function strategies, and support for co-occurring anxiety or depression — this is where psychologists add the most value.

And importantly: a good GP knows when to refer. If a GP feels out of their depth — whether because the presentation is complex, the differential diagnosis is unclear, or they're not confident in the clinical picture — the right move is to refer to a psychiatrist or psychologist for further input.

This is also why the "who diagnosed you?" question is becoming less useful over time. As GP diagnostic authority expands and collaborative models mature, the meaningful question shifts from "what letters does your clinician have after their name?" to "was your assessment thorough?"

What to look for when choosing a provider

Whether you're seeing a psychiatrist, psychologist, or GP, the same quality markers apply:

Will they assess against DSM-5 criteria?

 A proper assessment maps your symptoms to a formal diagnostic framework. If this isn't part of the process, ask why.

Will they explore your developmental history? 

ADHD requires evidence of childhood onset. If no one asks about your childhood, key diagnostic information is missing.

Will they seek collateral? 

Input from someone who knows you, or historical records, strengthens the diagnosis regardless of who's conducting it.

Will co-occurring conditions be explored? 

Depression, anxiety, trauma, sleep, and substance use all need to be actively considered.

Can they prescribe, or do they have a clear pathway to a prescriber? 

If your assessor can't prescribe, there should be a plan for how the medication component will be handled — not a gap you're left to figure out yourself.

How Kantoko fits into this picture

The traditional model asks you to navigate between separate clinicians — find a psychologist for assessment, a psychiatrist for prescribing, a GP for physical health — and somehow coordinate between them yourself. Kantoko was built around a different idea: a single care team that handles assessment, treatment, and coordination in one place.

Our ADHD Doctors handle assessment and ongoing treatment. Our registered nurses provide interim support between appointments. Our customer care team coordinates your care — appointments, follow-ups, making sure nothing falls through the cracks.

Your care lives on one platform, your regular GP is kept across your treatment plan, and if your needs change or you move states, your care adapts rather than restarting.

The question isn't which type of clinician diagnosed you. It's whether your care is thorough, coordinated, and ongoing. That's what we're built for.

If you're looking for ADHD care that doesn't depend on navigating the system alone, get started with Kantoko today.

This article is for informational purposes only and is not a substitute for professional medical advice. Always consult a qualified healthcare provider for diagnosis and treatment options.