Assessment overview
How this assessment usually works
Digestive-system WPI depends on the objective disease, anatomic change, treatment and functional criteria in AMA5 Chapter 6 as modified by NSW Chapter 16. Symptoms alone do not replace the required examination and investigation evidence.
For digestive system, the assessor gives a medical opinion about permanent impairment under the NSW workers compensation guidelines; the assessor does not decide legal liability. Once the body-system method and percentage are understood, separate advice may be needed about Section 66 compensation, weekly payments, medical-expense time limits or work injury damages.
Injuries and diagnoses assessed in this body system
The referral and report should identify the accepted diagnosis precisely. Similar symptoms can use different assessment methods depending on the injured structure.
- accepted oesophageal, gastric, intestinal, colorectal, anal, liver, biliary or pancreatic injury or disease
- abdominal-wall or inguinal hernia and stable post-repair consequences
- ilioinguinal nerve injury, excessive induration or recurrence after hernia repair
- post-traumatic splenectomy or functional asplenia
- intra-abdominal adhesions after trauma requiring further laparotomy
When a permanent impairment assessment can occur
For digestive system, assessment should occur only after maximum medical improvement (MMI). NSW Guidelines paragraph 1.15 describes a condition that is well stabilised and unlikely to change substantially during the next year, with or without treatment.
For digestive system, if adequate treatment or rehabilitation could materially change the impairment, paragraph 1.16 says the assessment should be deferred. The report should explain why the timing is appropriate.
For digestive system, the assessor should consider whether active disease, further surgery, nutritional treatment or changing medication is likely to materially alter the digestive impairment before finalising WPI.
The NSW and AMA5 assessment method
The NSW Workers Compensation Guidelines prevail over AMA5 wherever the two differ. The method is a medical assessment framework, not a self-scoring exercise.
NSW Guidelines Chapter 16 applies AMA5 Chapter 6 with specific NSW rules for hernia, analgesic-related symptoms, splenectomy and adhesions.
The AMA5 digestive classes integrate symptoms with objective anatomic or physiological abnormality, treatment needs and nutritional consequence. Weight loss and ability to maintain adequate nutrition are important severity criteria where the relevant digestive table uses them.
Objective investigation can include endoscopy, imaging, biopsy, pathology, examination and functional tests appropriate to the organ. The precise test and class depend on whether the accepted condition affects the upper tract, lower tract, liver, biliary system, pancreas or abdominal wall.
A hernia cannot be established from ultrasound alone: NSW paragraph 16.7 requires a palpable defect and either a palpable lump or a history of a lump on straining.
Post-repair ilioinguinal nerve injury and excessive induration use the NSW persistence and non-combination rules. They are assessed separately but only the higher valid result is used.
What the assessor actually measures
For digestive system, the percentage should be traceable to relevant, stable and reproducible findings.
- objective anatomic or physiological abnormality demonstrated by examination, endoscopy, imaging, biopsy, pathology or organ-specific testing
- frequency and severity of symptoms, treatment and dietary restriction linked to the accepted condition
- documented weight change, ability to maintain nutrition and need for supplements, enteral or parenteral support where relevant
- palpable hernia defect, lump history, recurrence and stable post-repair findings
- localised ilioinguinal sensory loss, severe dysaesthesia or excessive induration persisting at least 12 months after repair
- operation records for splenectomy, adhesions, bowel resection, stoma or further laparotomy
How the measurements are converted to WPI
Select the applicable AMA5 Chapter 6 organ table, identify the supported class, and choose the precise WPI from objective disease severity, treatment, nutrition and functional effect.
A person with only occasional symptoms, no objective disease, no treatment or diet restriction and adequate nutrition may have no rateable digestive impairment under the applicable method.
Post-repair ilioinguinal nerve injury and induration are not combined. NSW paragraph 16.5 requires the higher valid impairment to be selected.
Any separate permitted physical WPI is combined through the Combined Values Chart, not ordinary addition.
Verified category and table examples
These short examples show how the published method works. They do not predict an individual assessment.
| Finding or category | Published value or method | Source |
|---|---|---|
| Post-repair ilioinguinal sensory loss persisting 12 months | 1% WPI | NSW Guidelines paragraph 16.2 and Table 5.1 |
| Severe post-repair ilioinguinal dysaesthesia persisting 12 months | Maximum 5% WPI | NSW Guidelines paragraph 16.3 and Table 5.1 |
| Post-traumatic splenectomy or functional asplenia | 3% WPI | NSW Guidelines paragraph 16.10 |
| Constipation without a rateable permanent disorder | 0% WPI | NSW Guidelines paragraph 16.9 |
Worked illustrations
How the assessment method can operate
These paraphrased illustrations explain the published method. They are not estimates of another worker's WPI.
Illustration: objective digestive disease and nutrition determine the class
Assumed findings: After an accepted abdominal injury and bowel surgery, a worker has stable objective intestinal abnormality, ongoing specialist treatment and documented difficulty maintaining weight despite an appropriate nutritional plan.
Method and arithmetic: The assessor applies the relevant AMA5 Chapter 6 intestinal class, using the objective anatomic change, treatment needs and verified nutritional effect. The exact WPI is selected within that class from the full severity criteria rather than from abdominal pain alone.
What the illustration shows: A worker with similar symptoms but no objective disorder or nutritional consequence may not meet that class. This paraphrased illustration explains the assessment logic and does not predict a result.
Method source: NSW Guidelines Chapter 16; AMA5 Chapter 6 digestive class method
Illustration: two post-hernia findings are not added
Assumed findings: More than 12 months after accepted hernia repair, a worker has supported ilioinguinal sensory loss and persistent excessive induration at the repair site.
Method and arithmetic: The assessor derives each valid rating under paragraphs 16.2-16.4, then applies paragraph 16.5: nerve injury and induration are not combined, so the higher valid impairment is selected.
What the illustration shows: Adding the two values would overstate the method. This is an illustration, not a predicted result.
Method source: NSW Guidelines paragraphs 16.2-16.5
What does not establish WPI by itself
These matters can remain medically and practically important, but they do not replace the measurements or category requirements in the applicable method.
- abdominal pain, reflux, altered bowel habit or nausea without objective disease and the evidence required by the selected organ table
- ultrasound alone as proof of a hernia
- constipation or irritable bowel symptoms without objective colon or rectal disease
- weight change assumed to be caused by the digestive condition without a supported history and nutritional assessment
- post-operative status without a stable rateable consequence
Evidence checklist
The assessor should receive enough material to test the accepted injury, stability, measurable impairment and any deduction.
- the accepted injury or disease description and any insurer liability decisions
- contemporaneous GP, hospital and treating-specialist records
- relevant investigations, pathology, procedure reports and treatment history
- earlier impairment assessments and evidence about any pre-existing impairment
- a current clinical opinion explaining stability and whether material improvement remains likely
- gastroenterology, colorectal, hepatology or surgical reports identifying the objective disorder and class criteria
- endoscopy, biopsy, pathology, imaging and organ-specific functional testing where relevant
- operation, stoma, nutritional, weight and treatment records
- palpable examination, recurrence, sensory and duration evidence for a hernia or post-repair consequence
Common insurer or report disputes
A disagreement about digestive system WPI may concern the accepted diagnosis, the body-system findings, the selected method, a deduction or the way another impairment was handled. The report should identify the disputed step rather than leave the percentage unexplained.
- a hernia is diagnosed from ultrasound alone
- constipation or irritable bowel symptoms are rated without objective disease
- nerve injury and induration are incorrectly combined
- the report omits required treating or endoscopy evidence
Sources for this assessment guide
The public NSW Guidelines control where they modify AMA5. AMA5 table references below identify the method without reproducing the proprietary table in full.
- NSW Guidelines Chapter 16, paragraphs 16.1-16.11: digestive, hernia, analgesic, splenectomy and adhesion modifications.
- AMA5 Chapter 6, including sections 6.1-6.7 and the relevant organ tables: objective disease, treatment, weight, nutrition and digestive class structure, subject to NSW rules.
Questions to ask when the report comes back
These questions help identify whether the report explains its method and evidence. They do not replace medical or legal advice about the particular assessment.
- What objective digestive finding supports the class?
- Does a specific NSW hernia rule apply?
- Are any values prohibited from combination?
- Are the treatment and operation records complete?
How this connects to thresholds and strategy
In a digestive system claim, SIRA's permanent impairment thresholds must be applied to the accepted injury and the supported body-system percentage. The general thresholds are 11% or more permanent impairment for physical injury and 15% or more for primary psychological injury; secondary psychological injury is treated differently. A threshold is an eligibility checkpoint, not a promised payment.
A low digestive system WPI opinion may affect weekly-payment planning, treatment time-limit issues, dispute posture and whether work injury damages threshold advice is required. Before the opinion is relied on, check the relevant measurements, body-system method, deduction and practical consequences.
Questions workers often ask
Can ultrasound alone establish a hernia for WPI?
No. NSW paragraph 16.7 also requires a palpable defect and either a palpable lump or a history of a lump on straining.
Is constipation assigned a WPI percentage?
NSW paragraph 16.9 states that constipation is a symptom and generally reversible, so 0% WPI applies.
How is post-traumatic splenectomy assessed?
NSW paragraph 16.10 assigns 3% WPI to post-traumatic splenectomy or functional asplenia following abdominal trauma.
Can post-hernia nerve injury and induration be added?
No. NSW paragraph 16.5 requires the higher valid impairment to be chosen rather than combining them.
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.