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How this assessment usually works
Amputation and serious injury assessment usually affects more than a single lump sum issue. The WPI report can shape treatment, prosthetic planning, domestic assistance, work capacity, Section 66, seriously injured worker status and work injury damages preparation.
The assessor does not decide legal liability. The assessment is a medical opinion about permanent impairment under the NSW workers compensation guidelines. The legal importance is what the percentage does to Section 66, weekly payments, medical expense time limits, settlement strategy or work injury damages preparation.
Step 1
Accepted injury
Check the accepted injury wording, body system and mechanism before looking at the percentage.
Step 2
Medical method
Check whether the correct NSW guideline method, clinical findings and records were used.
Step 3
Claim effect
Check what the WPI percentage changes before accepting a report or settlement position.
What the assessor usually checks
- accepted amputation level, traumatic injury, multiple injury or catastrophic injury description
- prosthetic, orthotic, OT, rehabilitation and specialist evidence
- whether multiple physical impairments need coordination by a lead assessor
- impact on work durability, safety, daily activities, care and transport
- whether the WPI result changes weekly payments, treatment limits or damages threshold advice
Evidence that may help
A useful WPI report depends on the material the assessor receives. These records often matter for amputation and serious injury:
- operation notes, prosthetic reports, rehabilitation plans and OT assessments
- specialist reports addressing long-term function, aids, care and treatment needs
- certificates of capacity and vocational evidence
- domestic assistance, home modification and equipment records where relevant
- records of psychological consequences, treated carefully as primary or secondary depending on the evidence
Common insurer or report disputes
- the insurer separates issues that need coordinated assessment
- prosthetic or OT evidence is missing from the impairment review
- capacity is overstated because a device allows limited activity
- secondary psychological symptoms are ignored for treatment or capacity issues
- the WPI result is used without checking downstream damages consequences
Questions to ask when the report comes back
How this connects to thresholds and strategy
SIRA says permanent impairment compensation generally requires 11% or more permanent impairment for physical injury, and 15% or more for primary psychological injury. Secondary psychological injury is treated differently. Those thresholds are not a payout promise; they are eligibility and strategy checkpoints that need to be applied to the accepted injury and current evidence.
A low WPI opinion may also affect weekly-payment planning, treatment time-limit issues, dispute posture, and whether work injury damages threshold advice is required. The safest approach is to review the method, evidence and consequences before signing or letting the insurer rely on a weak assessment.
Questions workers often ask
Is amputation and serious injury assessed the same way as every other injury?
No. NSW permanent impairment assessment depends on the accepted injury, body system, medical evidence, maximum medical improvement and any NSW-specific guideline modification. The assessment method for amputation and serious injury should be checked against the injury actually accepted in the claim.
Can I calculate the WPI percentage myself?
No. A trained permanent impairment assessor must perform the assessment. A worker can still check whether the report used the correct injury description, records, body system, causation assumptions and deduction reasoning.
What if the insurer report seems too low?
Ask for the report and the material sent to the assessor. For amputation and serious injury, compare the report against treating records, imaging, specialist material, work duties and certificates of capacity before accepting the percentage or relying on it for settlement strategy.
Does maximum medical improvement matter?
Yes. SIRA guidance says permanent impairment assessment should occur when the condition has stabilised and is unlikely to change substantially in the next year with or without treatment. If treatment is incomplete, the timing may need review.
General information only
This information is general in nature and is not legal advice. You should obtain advice about your own circumstances before relying on a WPI percentage, accepting a lump sum offer, or responding to an insurer decision.
Reviewed by NSW Work Injury Claims - a branch of Stephen Young Lawyers.
Related injury and impairment pages
Need a WPI assessment checked?
If the percentage does not match the accepted injury, treatment history, imaging, surgery, work duties or current restrictions, get the report checked before accepting the insurer position.