Medicare Rebate for Autism and ADHD Assessment in Australia: MBS Items Explained

If your child is being assessed for autism, ADHD, or another complex neurodevelopmental condition, there are Medicare rebates available — but understanding exactly what they cover, what they do not, and how to access them requires navigating some Medicare bureaucracy that is not well explained on any government website.

Here is a plain-language breakdown.

The Core Items: MBS 135 and MBS 137

Two Medicare Benefits Schedule items specifically cover comprehensive assessment for complex neurodevelopmental disorders:

MBS Item 135 applies to assessments conducted by a Consultant Paediatrician. It covers a comprehensive assessment, diagnostic formulation, and the development of a management plan for a patient with a suspected complex neurodevelopmental disorder.

MBS Item 137 is the equivalent item for Specialist Psychiatrists.

As of March 2023, the age eligibility for these items was raised from "under 13 years" to "under 25 years." This change was significant — it acknowledges the reality that many people are not diagnosed with autism or ADHD during childhood, and that late diagnosis has legitimate clinical and functional consequences.

What the rebate covers: The Medicare benefit under these items is approximately $234.35 to $265.60, against a schedule fee of $312.45. This means Medicare covers 75% to 85% of the schedule fee. Your out-of-pocket cost depends entirely on whether the specialist charges the schedule fee (in which case you may owe nothing or very little under Medicare Safety Net rules) or whether they charge above the schedule fee, in which case you pay the gap.

These are "once per lifetime" items. Each item — 135 and 137 — can only be claimed once in a person's lifetime. They are specifically designed for the initial comprehensive diagnostic assessment, not for ongoing consultations.

What These Items Do Not Cover

This is the part that trips up most families.

MBS Items 135 and 137 cover the paediatric or psychiatric component of assessment — the diagnostic formulation by the specialist. They do not cover:

• Psychological testing by a psychologist — the WISC-V cognitive assessment, academic achievement testing (WIAT-III), or adaptive behaviour measures. These are conducted by a psychologist and billed separately.
• ADOS-2 administration by a psychologist — if the autism diagnostic process includes an Autism Diagnostic Observation Schedule conducted by a psychologist rather than being embedded in the paediatrician's consultation, this is billed separately.
• Speech pathology assessment — which is often part of an autism diagnostic work-up.
• Occupational therapy assessment — if functional capacity is being assessed as part of the diagnostic process.

What this means practically: families often receive the MBS rebate for the paediatrician or psychiatrist consultation but still face significant out-of-pocket costs for the psychological and allied health components. A comprehensive assessment for autism might involve the paediatric consult (Medicare-rebated), plus psychoeducational testing ($800 to $2,000), plus speech pathology ($900 to $1,150), plus OT if required. The total cost before rebates can reach $3,000 to $5,500.

Follow-On Medicare Items: After Diagnosis

Once a diagnosis is made, further Medicare support exists through allied health treatment items.

MBS Item 82030 covers ongoing allied health sessions (psychology, speech pathology, OT) under a management plan developed by the specialist. This item provides rebates for up to 20 lifetime sessions to support the implementation of the management plan generated by the MBS 135/137 assessment.

This is a separate pathway from the Better Access mental health items (which provide up to 10 sessions per year for psychological treatment under a Mental Health Treatment Plan from a GP). If your child already has a Mental Health Treatment Plan, the specialist-based management plan items work differently and are not interchangeable.

The NDIS Assessment Pathway — Separate From Medicare

A common point of confusion: Medicare-funded diagnostic assessments and NDIS access assessments are not the same thing.

An NDIS functional capacity assessment — required when seeking NDIS funding for specific supports — is typically conducted by an occupational therapist and costs between $1,550 and $2,700 for a standard assessment, with complex assessments exceeding that range. This is not covered by Medicare and is not the same assessment as a diagnostic evaluation for autism or ADHD.

The relationship between a diagnostic assessment and an NDIS application is this: a diagnostic report (e.g., "Autism Spectrum Disorder") is useful as supporting evidence when applying for NDIS access, but the NDIS does not fund based on diagnosis alone. It funds based on functional impact. The functional capacity assessment by an OT is what translates a diagnosis into the evidence of "substantially reduced functional capacity" that NDIS access requires.

For children under nine, the NDIS Early Childhood Approach provides a separate entry pathway that does not require a formal diagnosis — only evidence of developmental delay or disability. From July 2026, the "Thriving Kids" program will create a further alternative pathway for young children with developmental delays and autism, though 79% of parents surveyed expressed concern about the transition timeline.

How to Access the Medicare Rebate

The pathway is:

1. Take your child to a GP. Explain your concerns — developmental, behavioural, learning difficulties.
2. The GP provides a referral to a paediatrician (for MBS Item 135) or psychiatrist (for MBS Item 137). The referral should specify that the purpose is assessment for a complex neurodevelopmental disorder.
3. The specialist conducts the comprehensive assessment across one or more appointments. Some assessments require multiple sessions.
4. Medicare rebates are processed through the specialist's billing system. Ask the specialist's office whether they bulk-bill for this item (meaning no out-of-pocket), charge the schedule fee, or charge above-schedule.

Most paediatricians do not bulk-bill for comprehensive assessment appointments. Expect a gap of $50 to $200 per session in most metropolitan areas, or more in specialty clinics. In regional and rural areas, bulk-billing rates can be higher due to workforce incentives, but access to paediatricians is more limited.

What About School-Based Assessment?

School psychologists in public schools provide assessments at no cost to families, but they are separate from the Medicare pathway and serve different purposes. School assessments typically focus on educational planning — what adjustments a child needs to access the curriculum — rather than formal medical diagnosis.

Importantly, school-based assessments can support NCCD documentation and help the school determine appropriate learning plan goals without a private or Medicare-funded assessment. However, for NDIS access, most NDIA plans require evidence from a registered specialist — a school psychologist's assessment alone is usually not sufficient for an NDIS application.

The Australia Disability Assessment Decoder explains how to use diagnostic reports from both Medicare-funded and private assessments to maximise school support, NDIS access, and exam accommodations — with state-by-state detail and letter templates for requesting formal planning meetings.

Out-of-Pocket Reality Check

Realistic scenario for a publicly-funded diagnostic assessment:

• GP consultation for referral: $0 to $40 gap
• Paediatrician assessment (MBS 135): $0 to $200 gap per visit, 1-2 visits
• If psychologist testing is included in paediatric clinic: varies
• School psychologist for educational profile: $0 (public school, with waitlist)
• Total range: $0 to $600 out of pocket for the core diagnostic component

Realistic scenario for a private comprehensive assessment:

• Paediatrician assessment: $0 to $400 gap (some bulk-bill)
• Private psychoeducational assessment: $1,500 to $3,000
• Speech pathology: $900 to $1,150 if required
• Total range: $2,000 to $4,500+ out of pocket

The gap between these scenarios is large. Knowing which pathway to start with — and how to use university clinics for the psychological testing component — can significantly reduce total cost without reducing assessment quality.

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