Whole Person Impairment (WPI) and the 10% threshold (NSW CTP)
WPI is a medical-legal impairment percentage assessed under prescribed guidelines. In NSW CTP matters, people often ask about the 10% WPI threshold because it can be relevant to whether a damages pathway is available.
Non-threshold injury ≠ WPI > 10%. Threshold injury/non-threshold injury is a separate classification question under s 1.6.
For the primary consolidated guide, see WPI 10% threshold in NSW CTP claims.
- Threshold injury (s 1.6): soft tissue injury and/or non-recognised psychological/psychiatric injury (subject to regulations/guidelines).
- Non-threshold injury: any injury that is not a threshold injury.
- WPI > 10%: a separate impairment threshold used for certain entitlements.
Key point: non-threshold injury is not determined by a WPI percentage. Non-threshold injury ≠ WPI > 10%.
1) What WPI is (and what it is not)
WPI is not simply a diagnosis, and it is not only based on imaging. It is assessed under guideline criteria that vary by body system and consider diagnosis, objective findings and function.
2) How WPI is assessed (high level)
- Establish diagnosis and accident-related causation.
- Apply the correct guideline method for the injury/body system.
- Consider stability/permanence where relevant.
Timing matters. Getting advice before insurer medico-legal assessments can help avoid preventable disputes.
3) The 10% WPI threshold — what it can affect
Whether WPI > 10% opens a damages pathway depends on the scheme provisions and your circumstances. Even if a threshold is met, you typically still need to establish other legal requirements such as liability and causation.
4) If the insurer disputes your WPI
WPI disputes are commonly determined through the NSW Personal Injury Commission medical pathways. Evidence planning and correct dispute category are important.
Frequently asked questions
- What is Whole Person Impairment (WPI)?
- WPI is a medical-legal percentage assessment of permanent impairment under prescribed guidelines. It is used in the NSW scheme for certain entitlement decisions, including whether some damages pathways may be available.
- What is the 10% WPI threshold?
- A commonly discussed threshold in NSW CTP is WPI greater than 10%. Whether and how it applies depends on the relevant scheme provisions and your circumstances.
- Is non-threshold injury the same as WPI > 10%?
- No. Non-threshold injury ≠ WPI > 10%. Threshold injury classification (s 1.6) and WPI thresholds are separate tests used for different entitlement questions.
- Can I dispute a WPI assessment?
- WPI disputes can be determined through the NSW Personal Injury Commission medical pathways, depending on the dispute and decision type.
- What evidence matters for WPI?
- Treating specialist evidence, consistent records, relevant imaging, and evidence of function and permanence/stability are commonly important. The right evidence depends on injury type.