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Autism Levels Explained: What Level 1, 2 and 3 Mean
Level 1, Level 2 and Level 3 autism describe the amount of support a person requires in areas affected by autism. They do not measure intelligence, potential or “how autistic” someone is.
The three levels come from the DSM-5 framework for autism spectrum disorder and remain part of the current DSM-5-TR approach. They are described as:
- Level 1 – Requiring support
- Level 2 – Requiring substantial support
- Level 3 – Requiring very substantial support
This page explains the differences between all three levels, how they are assessed, why two people at the same level can still have very different needs, whether levels can change and what they mean when applying to the NDIS.
What Do Autism Levels Measure?
Level 1, Level 2 and Level 3 are severity specifiers used within the autism diagnosis. They consider support requirements across two separate areas:
- Social communication and social interaction
- Restricted or repetitive behaviours, interests and patterns
These two areas are assessed separately. A person does not necessarily need to have the same severity level in both. For example, someone may require substantial support with social communication while having a different level of support need around restricted or repetitive behaviours.
This is important because the number alone does not describe everything about the person. An autism level does not tell you:
- A person’s intelligence
- Whether they speak or use another communication method
- Whether they can work or study
- Whether they can live independently
- Exactly what disability supports they need
- How much NDIS funding they will receive
The level is one part of a much broader understanding of the person’s strengths, difficulties and support needs.
Level 1 vs Level 2 vs Level 3 Autism
| Autism Level | Description | What It Broadly Means |
|---|---|---|
| Level 1 | Requiring support | Support is required for autism-related differences that affect functioning. |
| Level 2 | Requiring substantial support | Autism-related differences have a more noticeable impact and substantial support is required. |
| Level 3 | Requiring very substantial support | Autism-related differences have a significant impact and very substantial support is required. |
The levels are not simply “mild, moderate and severe autism.” They describe the amount of support required within the diagnostic areas. People within the same level can still have very different communication, sensory, social and daily living needs.
Level 1 Autism: Requiring Support
Level 1 autism means the person requires support in areas affected by autism. Without appropriate support, differences in social communication, flexibility, organisation or adapting to different situations can interfere with everyday functioning.
Someone with Level 1 autism may manage independently in some areas while needing considerably more assistance in others. Their difficulties may also be less obvious to other people.
Level 1 therefore should not automatically be described as “mild autism.” A lower support-level classification does not mean autism has little effect on the person’s life.
Level 2 Autism: Requiring Substantial Support
Level 2 autism means the person requires substantial support in areas affected by autism.
Social communication differences are generally more noticeable and continue to affect functioning even when some support is available. Difficulty with change, restricted or repetitive behaviours and other autism-related needs can also interfere with everyday activities.
The exact support required still differs from person to person. One Level 2 autistic person may need substantial support with communication and community participation while managing many personal activities independently. Another may need regular assistance across several parts of daily life.
Level 2 identifies a substantial level of support need. It does not create one standard profile that applies to everyone.
Level 3 Autism: Requiring Very Substantial Support
Level 3 autism means very substantial support is required in areas affected by autism.
Communication and social interaction differences, restricted or repetitive behaviours and difficulty coping with change can have a significant effect on everyday functioning.
The level does not determine a person’s communication method or intellectual ability. Some Level 3 autistic people use speech. Others communicate through AAC, gestures, visual systems or other methods.
Daily living needs also vary. One person may require extensive assistance across many parts of the day, while another may have stronger independence in particular activities despite needing very substantial support elsewhere.
Level 3 therefore describes the level of support required, not a fixed list of characteristics.
Why the Same Autism Level Can Look Very Different
Two people can both have Level 2 autism and still have very different lives and support requirements. One person might communicate through speech, work, or study and need substantial support with social interaction, planning, and unexpected change.
Another person at the same level might require more regular assistance with communication and everyday activities. Differences between autistic people can include:
- Communication
- Sensory processing
- Social interaction
- Executive functioning
- Learning
- Personal care
- Daily living skills
- Managing change
- Emotional regulation
- Mobility
- Co-occurring disabilities or health conditions
Strengths also differ between individuals. This is why the autism level should never replace an individual assessment of what the person actually manages independently and where support is required.
Can an Autism Level Change Over Time?
Autism is lifelong, but the amount of support a person requires can change. Skills can develop. Daily demands can become easier or more difficult. A person’s environment, available support and stage of life can also affect how much assistance they need.
For example, support needs may look different:
- During childhood and adolescence
- After leaving school
- When starting work or further study
- When moving away from the family home
- During major changes in everyday demands
- After gaining new communication or daily living skills
DSM severity specifiers describe current severity, so a level assigned during an earlier assessment may not always reflect the person’s current presentation.
If an old assessment no longer appears to represent current support needs, an appropriately qualified clinician can advise whether reassessment is needed.
A change in autism level does not automatically change an NDIS plan. Diagnostic assessment and NDIS planning are separate processes.
How Autism Levels Are Assessed in Australia
Australia has a National Guideline for the Assessment and Diagnosis of Autism.
The first National Guideline was released in 2018, with an updated second edition published in 2023. The current Australian guideline supports assessment using recognised diagnostic frameworks including DSM-5-TR and ICD-11.
An autism assessment considers the person’s broader presentation rather than assigning a level from a short checklist. Assessment can include:
- Developmental history
- Social communication and interaction
- Restricted or repetitive behaviours and interests
- Everyday functioning
- Information from different environments
- Other conditions that may affect the person’s presentation
- Individual strengths and support needs
The professionals involved depend on the person’s age, circumstances and assessment requirements. When the DSM framework is used, the clinician specifies the current severity of the autism-related characteristics and the support required.
For the NDIS List A criteria specifically, current NDIS guidance identifies qualifying Level 2 and Level 3 autism diagnosed and assessed by appropriately qualified clinicians.
Autism Levels and NDIS Access in Australia
Autism levels are relevant to NDIS access, but they should not be treated as a complete NDIS eligibility decision or a measure of how much funding someone will receive.
Current NDIS guidance uses List A and List B when considering certain permanent conditions.
| Autism Presentation | NDIS List | What This Means for Access |
|---|---|---|
| Qualifying Level 2 or Level 3 autism under the specified diagnostic criteria | List A | Considered likely to meet the NDIS disability requirements |
| Autism that does not meet the List A severity criteria | List B | Permanence is generally recognised, but further evidence of functional impact is required |
Level 2 and Level 3 Autism
Qualifying Level 2 and Level 3 autism is included on the NDIS List A of conditions likely to meet the disability requirements. This is different from saying that an autism level determines every part of NDIS eligibility.
Applicants still need to meet the other applicable NDIS access requirements. The level also does not decide:
- Which supports appear in a plan
- How many support hours are funded
- The size of an NDIS budget
- Whether a particular requested support will be funded
Those decisions depend on the participant’s individual disability-related needs and the NDIS requirements that apply to funded supports.
Level 1 Autism
Autism that does not meet the List A severity criteria appears within List B, which covers conditions likely to result in permanent impairment but generally requiring further evidence about functional capacity.
A Level 1 diagnosis therefore does not mean someone cannot access the NDIS. What matters is whether the person meets the applicable disability requirements and whether the evidence demonstrates the required functional impact. The NDIS considers functional areas including:
- Communication
- Social interaction
- Learning
- Mobility
- Self-care
- Self-management
Someone with Level 1 autism can have significant support needs even when those difficulties are less visible to other people.
Common Misunderstandings About Autism Levels
Level 1 Means Mild Autism
Level 1 means requiring support. It does not mean autism has little impact on everyday life.
Level 3 Means Someone Is More Autistic
The levels describe support requirements. They do not measure the amount of autism a person has.
A Higher Autism Level Means Lower Intelligence
Autism severity and intellectual functioning are separate. Autism can occur with or without accompanying intellectual impairment.
Everyone at the Same Level Needs the Same Support
Two people at the same autism level can have very different communication, sensory and daily living needs.
One Level Must Describe Every Part of Autism
Severity is specified separately for social communication/social interaction and restricted or repetitive behaviours. The levels in the two areas can differ.
Autism Level Determines NDIS Funding
It does not. Autism level can be relevant to access, but NDIS funding is based on the participant’s individual disability-related support needs and applicable funding rules.
Frequently Asked Questions About Autism Levels
Is Level 1 autism the same as Asperger's syndrome?
Not exactly. Asperger’s disorder was one of the separate diagnoses brought under the broader autism spectrum disorder diagnosis when DSM-5 was introduced in 2013.
Some people previously diagnosed with Asperger’s may now meet autism criteria associated with Level 1 support needs, but the terms are not exact equivalents.
Can someone have Level 1 in one area and Level 2 in another?
Yes. Autism severity is specified separately for social communication/social interaction and restricted or repetitive behaviours, so the two levels do not need to be identical.
Do autism levels tell you whether someone can speak?
No. Communication method is not determined by autism level. Autistic people may use speech, AAC, visual communication, gestures or combinations of different methods.
Does autism level tell you whether someone has an intellectual disability?
No. Intellectual functioning is considered separately from autism severity.
Does every autistic person qualify for the NDIS?
No. NDIS access depends on meeting the applicable eligibility requirements. The effect of the person’s permanent impairment and the evidence provided are important parts of the access process.
Does Level 3 autism mean a larger NDIS plan?
No. There is no standard NDIS budget attached to an autism level. Funding reflects the participant’s individual disability-related support needs and the supports approved in their plan.
What if my autism assessment is several years old?
An older autism diagnosis does not automatically become invalid because time has passed. If the recorded severity level no longer appears to reflect current support needs, discuss whether reassessment is appropriate with an appropriately qualified clinician.
NDIS Autism Support Based on Individual Needs
An autism level gives useful information about support requirements, but it does not define the person or tell a provider exactly how their support should be delivered.
Hilda Care provides NDIS autism support in Melbourne across personal care, life skills, community participation, Supported Independent Living, household support, respite and transport.
Support is based on the participant’s individual needs, communication, daily life, and funded services rather than applying the same approach to everyone with the same autism level.
Registered NDIS Provider – 4050126032