A diagnosis identifies a condition. Functional evidence describes how an impairment affects activities and participation. These are different questions, and one does not make the other irrelevant.
For an NDIS application, evidence may be needed about the impairment, treatment, whether it is likely to be permanent and its practical effects. Other eligibility requirements also apply.
What a diagnosis can establish
A diagnostic or treating report may explain the condition, relevant investigations, treatment and expected course. Depending on its author and purpose, it may also contain useful observations about daily activities.
It is inaccurate to assume that a medical letter only names a condition. Read what the existing evidence actually addresses before deciding another assessment is necessary.
What functional evidence adds
Functional information explains the activities affected, the kind of assistance required and the circumstances in which a difficulty occurs.
Consider a hypothetical example of a person who has reduced hand function. The clinical information may describe the impairment. A functional account might then explain that the person can prepare some food but needs help opening packaging and handling particular kitchen items.
The equipment used, assistance available and the frequency of the task are part of that account. The diagnosis alone does not establish those details, and the task description alone may not establish the medical cause or permanence.
Keep the connection supported
An FCA should explain the relationship between the documented impairment and the findings where the evidence permits it. It should not simply repeat a diagnosis before a list of recommendations.
Nor should it guess that every difficulty is caused by one condition. The environment, another health issue or a change in support may also matter. Where attribution is uncertain, that should be stated.
Information sources need to remain clear. A participant's description, a treating professional's observation and the FCA assessor's direct findings are not interchangeable, although each can contribute.
Does everyone need an FCA?
No. The NDIA states that an FCA is not compulsory for eligibility. Existing evidence from the person, treating professionals and other relevant contributors may be sufficient.
An FCA may help when a particular question about activities or support needs remains unanswered. Before booking, identify that question and check what the receiving organisation requires.
A report should not be commissioned merely to replace ordinary language with funding terminology. Useful evidence makes the activity and reasoning understandable; a preferred phrase does not determine eligibility.
Different decisions need different evidence
An NDIS access decision, a request for particular supports and a DSP claim use different requirements. A report that is useful for one purpose may need additional information for another.
Tell the assessor the intended purpose before the work begins. That makes it possible to agree a suitable scope and avoid assuming that one diagnosis letter or one FCA will answer every system's questions.