I-CAN v6 and Dual Diagnosis

When you have more than one condition — and how to describe the combined impact

Disclaimer: This article reflects publicly available information about the I-CAN v6 framework as at September 2026. It does not constitute professional disability support, medical, or legal advice. For personalised guidance, contact the NDIA on 1800 800 110, your Support Coordinator, or a disability advocacy organisation.

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Dual diagnosis — living with more than one disability condition — is more common in the NDIS than single diagnosis. Many of the most significant NDIS participants have complex presentations: autism alongside intellectual disability, acquired brain injury alongside depression, cerebral palsy alongside epilepsy, intellectual disability alongside psychosocial disability.

What these combinations share is this: the interaction between conditions often creates more functional support need than either condition would alone. Autism plus intellectual disability is not simply the sum of two sets of needs — the combination affects communication, learning, behaviour, and social participation in ways that are qualitatively different from either condition alone.

The I-CAN v6 assessment is designed to capture functional support needs, not diagnoses. In principle, this should serve dual diagnosis participants well. In practice, it depends entirely on how you describe the combined functional impact — and whether you describe it as an interaction rather than as two separate lists.

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Why the 2026 Law Changes the Stakes for Dual Diagnosis

The NDIS Amendment Act 2026 changes how eligibility will be assessed from January 2028. Under the new rules, a condition must independently meet the "permanent and significant" threshold to establish eligibility.

For dual diagnosis participants, this creates a specific consideration:

If one of your conditions clearly meets the threshold: Your eligibility is established. Both conditions and their interaction will be captured in the I-CAN v6 functional assessment.

If neither condition alone would clearly meet the threshold, but the combination does: This is where careful documentation becomes more important. The new rules do not prevent dual diagnosis participants from accessing the NDIS — but they require that the functional impact be clearly demonstrable.

The most protective approach: document the combined functional impact, not two separate sets of impacts. An assessor reading two moderate-impact descriptions may see two cases that individually fall short. An assessor reading one description of significant combined impact will see a case that clearly qualifies.

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Common Dual Diagnosis Presentations in the NDIS

Autism + Intellectual Disability

The most common dual diagnosis in the NDIS. The combination typically produces more severe support needs than either condition alone — particularly in:

• Communication: Autistic communication differences combined with cognitive processing limitations compound difficulty in expressing needs, understanding instructions, and managing novel social situations
• Learning & Applying Knowledge: Difficulty both in processing abstract concepts (intellectual disability) and in adapting approaches when the usual methods don't work (autism rigidity)
• Behaviours of Concern: Many challenging behaviours arise at the intersection of communication difficulty, sensory sensitivity, and cognitive limitations in understanding expectations
• General Tasks and Demands: Routine disruption is harder to manage when both flexibility and problem-solving capacity are limited

How to describe the interaction: "When routines are disrupted, [participant] cannot process the change cognitively or communicate distress verbally. This combination means that routine disruptions consistently result in escalating behaviour that requires skilled, known support workers who can manage both the communication and the behavioural response."

ABI + Depression

Acquired brain injury frequently leads to depression — both as a neurological consequence of the injury and as a response to the profound life changes it brings. The interaction means:

• Motivation and initiation: ABI executive dysfunction already makes initiating tasks difficult; depression compounds this into paralysis
• Cognitive recovery: Depression significantly slows cognitive rehabilitation and recovery
• Social participation: ABI-related fatigue combined with depression-related withdrawal creates compounding isolation
• Medication management: Complex medication regimens for both conditions with interactive effects

How to describe the interaction: "The executive dysfunction from the ABI and the anhedonia from the depression reinforce each other — I cannot initiate tasks, and I have no motivation to try to overcome that difficulty. The combination means my personal care routines require significantly more external structure than either condition would alone."

Cerebral Palsy + Epilepsy

Physical disability combined with a neurological condition that creates unpredictable safety risks:

• Safety across domains: Already limited physical capacity combined with seizure risk creates compounding safety concerns in self-care, cooking, bathing, and community access
• Mobility: Physical mobility limitations and inability to drive combine to severely restrict independence
• Physical Health: Complex management of both conditions, multiple medications, multiple specialists

Psychosocial Disability + Intellectual Disability

Often occurs in people with Down syndrome (who have elevated rates of dementia and depression) or people with intellectual disability who develop mental health conditions:

• Communication of distress: Limited verbal capacity combined with mental health symptoms that affect emotional regulation and expression
• Behaviours of Concern: Mental health symptoms (anxiety, depression, psychosis) expressed through behavioural changes are difficult to distinguish from ID-related behaviours without careful observation
• Support worker skill requirements: Workers must understand both conditions and their interaction

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How to Document Combined Functional Impact

The key principle is to describe your daily life as it actually is — shaped by the interaction of your conditions — rather than writing a separate section for each diagnosis.

Instead of:

"[Domain 1] — Due to my autism, I have difficulty with [autistic trait]. Due to my intellectual disability, I have difficulty with [ID trait]."

Write:

"[Domain 1] — I need [specific support] because the combination of [how autism affects this] and [how ID affects this] means that [what actually happens in daily life without that support]."

Practical approach for your preparation document:

1. Describe your typical day across each relevant domain
2. Note everything that requires assistance, prompting, or doesn't happen at all
3. In each area, briefly note which condition contributes most — but focus on the functional outcome, not the causal analysis
4. Be specific about what support is currently provided and what would happen without it

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The Risk of Understatement

One specific risk for dual diagnosis participants is that they describe each condition modestly, and an assessor perceives two manageable situations rather than one complex combined situation.

Avoid this by:

• Describing what a difficult period looks like — when both conditions are simultaneously active
• Documenting specific incidents where the combination of conditions created a situation that neither alone would have
• Having a carer or support worker provide a statement from their daily observation perspective — they often see the interaction most clearly
• Describing what makes your situation different from someone with only one of your conditions

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Evidence That Carries Weight

For each condition: Current specialist reports (neurologist, psychiatrist, psychologist) that describe functional impact, not just diagnosis.

Cross-condition OT assessment: An occupational therapist who can see the combined functional picture across all domains and describe the interaction is particularly valuable for dual diagnosis participants.

Carer/support worker statement: Someone who works with you daily and sees the combined functional impact can describe things that professional reports from separate specialists may miss.

Incident records: Any documented incidents, crisis presentations, or behavioural incidents that illustrate the combined impact are relevant evidence.

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ICANReady guides you through all 12 I-CAN domains with prompts that encourage you to describe your daily life as it is — including how multiple conditions interact in practice — rather than separating your experience artificially by diagnosis.

Try ICANReady free →

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Sources: Centre for Disability Studies I-CAN v6 framework, NDIA support needs assessment guidance (ndis.gov.au), Disability Advocacy Network Australia (dana.org.au), People With Disability Australia (pwd.org.au)