Private Autism Assessment Cost in South Australia and How Medicare Helps

When the public waitlist is two years long and your child is struggling in school right now, many SA families start researching private assessment. The first question is always cost — and the numbers are confronting if you walk in unprepared. But there is a Medicare mechanism most families aren't told about that meaningfully reduces what you pay.

What a Comprehensive Private Autism Assessment Involves

Autism diagnosis in Australia requires a multidisciplinary assessment. A diagnosis from a single clinician — a paediatrician alone, for example — is not sufficient for a rigorous diagnosis and will not be accepted by the NDIS or the SA Department for Education for high-tier funding purposes.

A thorough private autism assessment typically includes:

Paediatrician or child psychiatrist assessment: Reviews medical history, developmental history, and current presentations. The paediatrician or psychiatrist takes a comprehensive history from parents and directly observes the child. They may administer structured observational tools or rely on standardised questionnaires.

Clinical psychologist assessment: Administers standardised diagnostic tools — most commonly the ADOS-2 (Autism Diagnostic Observation Schedule, Second Edition) and the ADI-R (Autism Diagnostic Interview, Revised). These are the gold-standard instruments for autism diagnosis and typically take two to three hours of direct assessment time plus time for scoring and report writing.

Speech pathology assessment: Evaluates communication function, language development, and pragmatic (social) communication. In younger children, this is often critical because speech and language delays are a primary concern for many families.

Occupational therapy assessment (sometimes included): Evaluates sensory processing, motor skills, and daily living function. Not always included in every assessment package, but relevant where sensory difficulties or motor delays are part of the clinical picture.

Not every family needs every piece of this. For a child with a clear autism profile and minimal co-occurring concerns, a paediatrician and psychologist assessment may be sufficient for diagnostic purposes. Discuss with the clinical team what is required for your child's specific profile.

Cost Ranges for Private Assessment in South Australia

Out-of-pocket costs vary significantly depending on the practice, the clinicians involved, and whether any Medicare rebates apply.

A full multidisciplinary assessment from a private practice (without Medicare subsidies) typically costs between $1,800 and $3,500 in South Australia. Practices that include multiple allied health professionals across multiple sessions at the higher end of this range; streamlined packages at smaller specialist practices at the lower end.

Individual components, where billed separately:

• Paediatrician assessment: $300 to $700 out-of-pocket (varies significantly by practice and gap fee policy)
• Clinical psychologist assessment (ADOS-2 and ADI-R): $800 to $1,500 depending on number of sessions and report complexity
• Speech pathology: $250 to $500 for a focused assessment
• Occupational therapy: $200 to $450

MBS Item 135: How Medicare Reduces the Paediatrician Cost

MBS Item 135 is a Medicare Benefits Schedule item available to consultant paediatricians for prolonged attendances — specifically, attendances greater than 45 minutes — for patients under 25 with suspected complex neurodevelopmental disorders. These include:

• Autism Spectrum Disorder (ASD)
• Cerebral Palsy
• Fragile X syndrome
• Angelman syndrome
• Prader-Willi syndrome
• Rett syndrome

To be eligible for Item 135, the purpose of the attendance must be the formulation of a diagnosis and the creation of a management and treatment plan for the suspected condition.

The Medicare rebate under Item 135 is approximately $149 (this figure is indexed and changes periodically — check the current MBS schedule). If the paediatrician charges $450 for the assessment, the Medicare rebate covers $149 and the family pays a gap of $301.

MBS Item 289 is the equivalent for consultant psychiatrists and covers the same conditions under similar attendance criteria.

These items exist specifically because comprehensive neurodevelopmental assessments are time-intensive and the standard short-consultation items do not adequately capture the clinical work involved. Item 135 allows paediatricians to spend the time needed without the family bearing the entire cost.

How to Access Item 135

The pathway to Item 135 is straightforward if you know the steps:

1. GP referral: Your GP must write a referral to a consultant paediatrician (a specialist, not a GP with a special interest in paediatrics). The referral should note that the purpose is assessment of a suspected complex neurodevelopmental condition, specifically ASD or another eligible condition.

2. Find a paediatrician who bills Item 135: Not all do. Call the practice before booking and ask: "Do you bill Medicare Item 135 for autism assessment attendances? Do you bulk-bill under Item 135, or is there a gap fee?" The answer varies by practice. Some bulk-bill (zero out-of-pocket). Many charge a gap — some practices charge several hundred dollars above the Medicare rebate.

3. Attendance must exceed 45 minutes: Item 135 requires a prolonged attendance. If the appointment is brief, it won't qualify for this item number. For a genuine autism assessment, this is rarely an issue — the appointments typically run 60 to 90 minutes or longer.

4. Item 135 can be used for multiple attendances: If the assessment requires more than one appointment (which is common for complex profiles), Item 135 can be billed for each attendance that meets the criteria.

Item 135 and the Broader Assessment Package

Item 135 only covers the paediatrician component. Clinical psychologist assessments — including the ADOS-2 and ADI-R — are not covered under MBS Item 135. However:

• If the child has a diagnosed condition and is under a GP's care plan, they may be eligible for up to 10 Medicare-rebated sessions with a clinical psychologist under the Better Access to Mental Health Care scheme (MBS Items 80000 and 80010). These are primarily for treatment, not diagnosis, but some psychologists use initial diagnostic sessions within this framework.
• The NDIS may fund some assessment costs if the child is already an NDIS participant.
• Some private health insurers cover a portion of clinical psychology costs depending on the level of cover.

What to Do with the Assessment Report Once You Have It

A formal autism diagnosis opens several pathways simultaneously:

At school: The diagnostic report becomes the key evidence document for an IESP application at IESP Category 4 or above (for Substantial or Extensive support needs). Submit it to the inclusion coordinator and request that an IESP application be lodged if one hasn't already been. Also request that the One Plan be updated to reflect the diagnosis and any recommendations in the report.

For NDIS: A confirmed autism diagnosis, particularly where the report includes functional impact statements, is the primary evidence base for an NDIS access request. Include the full report, not just the diagnostic conclusion.

For NAPLAN and SACE: The assessment report, combined with the school's documentation of ongoing support provision, provides the evidence base for NAPLAN adjustment applications and SACE Special Provisions applications.

For future assessments: Keep the original report indefinitely. Schools, the NDIS, and universities will all request it at various points. Having a clean, properly scanned copy accessible is worth the administrative effort.

When Cost Is the Barrier

If private assessment is genuinely out of reach financially, several options reduce the burden:

• Investigate bulk-billing paediatricians who use Item 135 — these exist in SA and eliminate the paediatrician cost
• Contact DACSSA (Disability Advocacy and Complaints Service of SA) for assistance navigating the public system and asserting your rights to interim school support while the public wait progresses
• Check with your private health insurer about what is covered under your extras policy for specialist consultations
• Talk to your school about accessing DfE Student Support Services (SSS) psychological assessment — the DfE psychologist cannot diagnose autism clinically, but can produce functional assessment reports that support IESP applications and One Plan documentation

The South Australia Disability Support Blueprint covers in detail how to build a school evidence file during the diagnostic waiting period, and how to use private assessment reports most effectively once you have them.

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