NCCD basics
Imputed disability: what it means for the NCCD
Imputed disability, or an imputed diagnosis, means the school team judges a disability exists without a diagnosis. When the NCCD allows it, and what to record.
Updated 25 September 202611 min read
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An imputed disability is a disability the school team judges to exist without a medical or allied health diagnosis. For the NCCD, a team can impute a disability when it has reasonable grounds and evidence, has consulted the student or their associate, and has confirmed the adjustments are due to disability, not academic performance, learning difficulties or external factors.
People often call this an imputed diagnosis, but the school is not diagnosing anything. It is making a professional judgement that a disability exists, based on the broad definition in the Disability Discrimination Act 1992 (DDA). A student with an imputed disability who receives adjustments and meets the other criteria must be counted in the NCCD, the same as a student with a diagnosis.
This guide covers when a school can impute, the 2026 check, what is not enough on its own, trauma, what "imputed ADHD" or "imputed autism" means, and what to record. New to the collection? Start with What is the NCCD?
What imputed means
The NCCD Quick Guide puts it in three words: imputed means "judged to exist". Where no medical or allied health diagnostic report is available, the school team can impute a disability to a student who is receiving adjustments, based on the DDA's broad definition of disability. The Victorian Department of Education's NCCD policy describes it the same way: a disability the school team reasonably believes the student has, though it has not been diagnosed.
So an imputed disability is not a lesser kind of disability for the NCCD. It is a different route to the same finding. The student is counted on the same criteria, and the level and category are chosen the same way.
| Question | Diagnosed disability | Imputed disability |
|---|---|---|
| Who makes the judgement | A medical or allied health practitioner, in a diagnostic report | The school team, using its evidence and professional judgement |
| What it rests on | The practitioner's diagnosis | Reasonable grounds and evidence, after consulting the student or their associate |
| The 2026 clarification | Does not apply: the check is for imputing. The adjustments must still address the disability's functional impact | The team confirms the adjustments are due to disability, not academic performance, learning difficulties or external factors |
| Counted in the NCCD | Yes, with evidence of adjustments for at least 10 weeks in the 12 months before Census Day | Yes, on exactly the same criteria |
| Level and category | Set by the adjustments, not the diagnosis | Set by the adjustments, the same way |
When a school can impute a disability
A school can impute a disability when all five of these hold. It is a decision for the school team, not for one teacher alone.
- No diagnostic report is available from a medical or allied health practitioner.
- The team has reasonable grounds. It can point to the functional impact it sees on the student's learning or participation, and link it to the DDA's broad definition of disability.
- The team has evidence to support the judgement, such as observations, work samples, assessment results, a functional needs checklist or input from specialists.
- The school has consulted the student or their associate. In most cases parents, guardians or carers should be consulted too, and from 2026, if they are not, the school records why. A brief explanation is enough.
- The team has confirmed the adjustments are due to disability, not academic performance, learning difficulties or external factors. This is the 2026 check, below.
Imputing does not replace the counting rules. The student still has to be counted in the school's August Census, and the school needs evidence of adjustments for at least 10 weeks of school education in the 12 months before Census Day (the NCCD 10-week rule). When all of that holds, the student must be included.
The 2026 check: disability, not a learning difficulty
The NCCD Guidelines: Effective 2026 Onward made one step explicit. Before imputing, the school team confirms the adjustments are due to disability, not academic performance, learning difficulties or external factors. It clarifies what imputing always meant; it is not a new process. See what the 2026 Guidelines clarified.
These questions help a team make the check honestly:
- Academic performance: Is the team responding to a pattern of functional impact, or only to low results?
- Learning difficulty: Is this a difficulty that resolves with good teaching or a short intervention, or an ongoing need the team can link to disability? A learning difficulty that has improved and no longer needs ongoing adjustment is not counted.
- External factors: Could attendance, a change of school, family disruption or learning English explain what the team sees, on its own?
- Teaching: Has the student had effective teaching? Ineffective instruction is not, on its own, a reason to include a student.
Write the answer down. One or two sentences on why the team is satisfied the adjustments are due to disability is the simplest evidence that the check was made.
What is not enough on its own
Some circumstances affect learning without being a disability. The Quick Guide lists these as not, on their own, a basis for including a student:
- Limited attendance
- A refugee background
- Family disruption
- Ineffective instruction
- Transience, such as frequent changes of school
- Learning English as an additional language or dialect
The same goes for English language support, or a behaviour management plan, with no evidence of a disability. None of these rules a student out. A student learning English, or one who has changed schools often, can also have a disability. These circumstances just cannot be the grounds for imputing one.
Students affected by trauma
Trauma on its own is not a disability for the NCCD. The Quick Guide says students affected by trauma are included only if they have a disability as the DDA defines it and meet the other criteria. A learning difficulty that comes from trauma, and does not amount to a disability, is not counted.
Where a student affected by trauma does have a disability, diagnosed or imputed, they are counted like any other student. The DDA's definition is broad: it includes a disorder, illness or disease that affects thought processes, perception of reality, emotions or judgement, or that results in disturbed behaviour. The team's question is whether the student has a disability as the DDA defines it, with a functional impact at school, not what happened to them. If the disability is imputed, the 2026 check applies: the team confirms the adjustments are due to that disability, not only to the circumstances around it.
Trauma-informed practice that every student receives is good teaching. On its own it does not make a student eligible.
Imputed ADHD or autism: what it means
"Imputed ADHD" or "imputed ASD" usually describes a student the school supports as having ADHD or autism without a formal diagnosis, for example while the family waits for an assessment. For the NCCD, four things follow.
- A disability, not a diagnosis: Teachers do not diagnose ADHD or autism. That stays with medical and allied health practitioners. The team judges, on reasonable grounds and evidence, that the student has a disability as the DDA broadly defines it.
- No diagnosis needed: The NCCD does not require one. A student waiting on an assessment can be counted without waiting for it, if the team has reasonable grounds and evidence, has consulted, has made the 2026 check, and the school has evidence of adjustments for at least 10 weeks in the 12 months before Census Day.
- The category follows the adjustments: An imputed disability with features of ADHD might be recorded as Cognitive or Social/emotional, depending on what the adjustments mainly address. The NCCD does not assign diagnoses to categories. See the four NCCD categories of disability.
- Describe, don't label: In the record, write the functional impact and the adjustment ("needs single-step instructions and a movement break to finish independent work") rather than "has ADHD". It is more accurate, and it is the evidence the NCCD asks for.
For classroom adjustments and example entries, see adjustments for ADHD and adjustments for autism.
What to record when you impute a disability
Schools do not have to create new evidence for the NCCD: the records you already keep count, in the form they exist. For an imputed disability, check they cover the four areas of NCCD evidence, plus the consultation about the imputation and the team's reasoning.
- Need: The functional impact the team observed, in teaching and learning, communication, participation, personal care or movement, with the observations, work samples and assessments behind it.
- Consultation: Who was consulted about the imputation, and when. If parents, guardians or carers were not consulted, a brief note of why. See documenting NCCD consultation.
- The reasoning: The grounds for the judgement, why the team is satisfied the adjustments are due to disability, who decided and the date.
- Adjustments: What was provided and how often, for at least 10 weeks in the 12 months before Census Day.
- Monitoring: Whether the adjustments are working, and what changed as a result.
- Category and level: The category that mainly drives the adjustments, and the highest level provided for the 10 weeks.
| Weak | Strong |
|---|---|
| Imputed disability. Suspected ADHD. | Team meeting, 12 May (coordinator, class teacher, learning support teacher). Across Term 1 Oliver needed instructions given one step at a time and a movement break every 20 minutes to finish independent work. Without them he finished under a third of his tasks. The pattern shows in every subject, including those where his results are at year level, and his attendance is regular, so the team does not see it as low achievement or an external factor. The team judges a disability exists and imputes it. Category: Cognitive, as the adjustments mainly address starting and finishing learning tasks. |
| Mum agrees. | Consultation, 9 May. Met Oliver and his mum about the imputation and the adjustments. She sees the same trouble starting tasks at home. Oliver says the movement break helps him finish. We will review in four weeks. |
Keep these records for 7 years (Australian Education Regulations 2023, s 37), or longer if your state requires it. That is the school's obligation.
If a diagnosis comes later
A later diagnosis confirms or refines what the team judged. It does not undo the record.
- Update the record: Note the diagnosis, the date and who made it, and keep the report with the student's NCCD records.
- Keep the evidence: The adjustments already evidenced were provided for a disability the team had judged to exist, so they stay part of the student's record.
- Check the category: A diagnosis does not decide it. If the adjustments still mainly address the same area, the category stays.
- If an assessment finds no disability: The team reviews the inclusion. A student who does not have a disability as the DDA defines it must not be counted.
A good time to revisit an imputation is the yearly review of each student's level. The Quick Guide asks for levels to be reviewed every year rather than assumed to have stayed the same, and the same habit keeps an imputation current.
Sources, and where to go next
This guide paraphrases Step 4 of the NCCD Quick Guide (2026 edition, Education Services Australia), which covers imputing disability, the NCCD Guidelines: Effective 2026 Onward and the Victorian Department of Education's NCCD policy. Where anything here differs from the Guidelines, the Guidelines take precedence. States and sectors can add their own steps: Victorian government schools, for example, record whether each student's disability is diagnosed or imputed in CASES21.
Next, read the four NCCD categories of disability to choose the category, and NCCD evidence requirements for what the whole record must show.