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How this assessment usually works
NSW guidelines treat chronic pain carefully. AMA5 Chapter 18 is excluded, and conditions associated with chronic pain are generally assessed through the underlying diagnosed condition. CRPS has its own NSW-guideline pathway and needs careful medical evidence.
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.
How the assessment pathway is usually built
A useful WPI report should show its working. For chronic pain and crps, the pathway usually needs these steps before anyone relies on the percentage.
Separate chronic pain from CRPS. NSW excludes AMA5 Chapter 18 chronic pain ratings, but CRPS has a specific NSW pathway.
For chronic pain without CRPS, identify the underlying diagnosed condition and body system that is actually assessed.
For CRPS Type 1, check whether the diagnostic criteria are met, whether the diagnosis has been present long enough, whether more than one physician has verified it, and whether mimicking conditions have been excluded.
For CRPS Type 2, identify the specific nerve injury and then consider the relevant sensory and motor deficit methodology.
Keep pain-related work capacity, treatment, medication, sleep and secondary psychological issues in the claim evidence even when they do not create a separate WPI rating.
Assessment method points from the NSW guideline
These points are not a self-calculation tool. They are practical checks for whether the WPI report is using the right body-system method and reasoning.
NSW excludes AMA5 Chapter 18 for chronic pain. Pain is usually assessed through the underlying diagnosed condition rather than as a separate pain rating.
CRPS has a specific NSW pathway. The report should address criteria, duration, signs, symptoms and exclusion of better diagnoses.
For CRPS Type 1, the guideline requires continuing disproportionate pain plus symptom and sign categories, diagnostic duration, verification by more than one examining physician and exclusion of other diagnoses.
The CRPS criteria look at sensory, vasomotor, sudomotor/oedema and motor/trophic symptoms and signs. A report should not say CRPS merely because pain is severe.
CRPS Type 2 requires objective evidence of a specific nerve injury and then uses the relevant sensory and motor deficit methodology.
The assessor should avoid double-counting pain already allowed for in another body-system rating.
Pain-related sleep disturbance, fatigue, medication effects and distress can still be highly relevant to weekly payments and work capacity.
Secondary psychological symptoms from chronic pain should be considered for treatment and capacity evidence, but they are not a separate psychiatric WPI rating for Section 66.
What can change the WPI percentage
The final percentage can move because of method selection, objective findings, surgery, pre-existing deduction, or how multiple impairments are combined. These are the practical pressure points for this injury type.
- The underlying accepted physical injury if chronic pain is assessed through another body-system chapter.
- For CRPS, documented symptoms and signs across sensory, vasomotor, sudomotor/oedema and motor/trophic categories.
- Duration, diagnostic confirmation and exclusion of other conditions that can mimic CRPS.
- Evidence of specific nerve injury for CRPS Type 2.
- Whether the report avoids double-counting pain already built into another impairment method.
What the assessor usually checks
- whether the diagnosis is chronic pain associated with another injury or CRPS
- the underlying accepted injury and whether pain is already allowed for in that assessment
- pain specialist, rehabilitation and therapy records
- functional impact on daily activities, sleep, medication, tolerance and work capacity
- whether psychological symptoms are secondary and should not be confused with primary psychiatric impairment
Evidence that may help
A useful WPI report depends on the material the assessor receives. These records often matter for chronic pain and crps:
- pain specialist and rehabilitation physician reports
- treating GP notes recording pain pattern, medication and functional effect
- physiotherapy, occupational therapy and graded activity records
- capacity certificates dealing with endurance, flare-ups, concentration and safe duties
- records explaining CRPS signs, symptom consistency and treatment response where relevant
Common insurer or report disputes
- the insurer says pain is subjective and not assessable
- the report double-counts or ignores pain instead of applying the NSW pathway
- CRPS signs are not recorded consistently
- secondary psychological symptoms are misused to reject capacity evidence
- treatment is described as excessive without engaging with specialist reasoning
Report cautions before relying on the percentage
Report red flags
- The report gives a chronic pain percentage under AMA5 Chapter 18 despite the NSW exclusion.
- CRPS is accepted or rejected without going through the required symptom/sign categories.
- CRPS Type 2 is discussed without identifying a specific nerve injury.
- Pain is used to increase WPI twice: once in the body-system rating and again as a separate pain rating.
Method and reliance checks
- Is the page dealing with chronic pain as a symptom of another injury, or a properly diagnosed CRPS pathway?
- Does the report record sensory, vasomotor, sudomotor/oedema and motor/trophic symptoms and signs where CRPS is alleged?
- Were pain specialist, rehabilitation and medication records included?
- Are secondary psychological symptoms separated from primary psychiatric impairment?
- Has CRPS been verified over time and have mimicking conditions been excluded?
- Does the report explain which underlying body system is assessed if chronic pain is not CRPS?
- Severe pain can be disabling, but NSW WPI assessment still needs the correct guideline pathway.
- CRPS should not be assumed from pain alone.
- Pain-related sleep, medication and fatigue may strongly affect work capacity even when they are not separately rated under AMA5 Chapter 18.
Guideline notes
- The NSW guideline excludes AMA5 Chapter 18.
- CRPS is assessed under the NSW criteria and relevant extremity impairment method.
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 chronic pain and crps 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 chronic pain and crps 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 chronic pain and crps, 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.