For thousands of Australians each year, recovering from an injury is hard enough without being told by insurers that a previous health issue might disqualify you from compensation. If you’ve ever heard that your old back injury or arthritis could prevent you from getting your full entitlements, you’re not alone.
The rules around pre-existing conditions and accident compensation are complex, often feeling like red tape meant to keep you from justice. Understanding your rights is the first step to cutting through the confusion and getting the outcome you deserve.
What Are Pre-Existing Conditions & Why Do Insurers Focus On Them?
In compensation cases, a “pre-existing condition” refers to any injury, illness, or degeneration that existed before your most recent work incident or accident. These can include things like old sports injuries, prior falls, or chronic issues such as osteoarthritis.
Insurers will carefully analyse your medical history after a claim is lodged, often requesting doctor’s notes, X-rays, and treatment records. The aim is usually to prove that all or part of your current condition was already present or likely to happen anyway.
This scrutiny doesn’t mean you lose your right to compensation. The law requires insurers and employers to ‘take their victim as they find them.’ This is known as the “eggshell skull rule.” Even if you were more vulnerable to injury due to an old problem, you are still covered if a workplace or road incident made things worse.
Yet, insurers frequently push back, claiming your pain or limitation is simply a flare-up of an older problem, not something new.
They may ask: would you have ended up in this situation regardless of the incident?
Sometimes, this boils down to detailed assessment of your work, daily life, and medical journey both before and after the event.

How Insurers Use Pre-Existing Conditions To Limit Claims
It’s not uncommon for insurers to push hard for apportionment, splitting the blame for your symptoms between the old and new injuries. When this happens, you may suddenly find only a fraction of your lost wages or medical costs are being recognised.
For instance, if you hurt your knee in a car accident but already had a football injury years ago, an insurer might argue that only a percentage of your impairment is “fresh.”
This tactic extends to lump sum claims for permanent impairment, where every percentage point of pre-existing disability can result in less compensation. Insurers will reference past appointments, GP notes, or any mention of pain in the area, sometimes even digging up decades-old complaints to justify a reduction.
To challenge this, you’ll need solid, clear medical evidence. It’s crucial to gather up-to-date specialist reports that compare your health before and after the latest incident. Family testimonies, photographs of your activities, or employer support letters can all help build a strong case.
How To Maximise Your Claim & Avoid Pitfalls
One of the keys to getting fair compensation is transparency, combined with robust medical backing. Always be honest about your past health challenges when speaking to your doctor or legal team. The best outcomes happen when clients:
- Request fresh medical evaluations that outline the specific impacts of the new injury.
- Collect practical evidence, like statements from friends, family, or co-workers, describing your abilities before and after the incident.
- Have a lawyer challenge vague or overly broad assertions from insurer-appointed doctors, insisting that causation is properly substantiated.
- Refuse to be pressured into accepting a reduced or lump sum settlement before all medical questions are resolved.
At times, the process will involve dispute resolution at the Personal Injury Commission, where independent experts may weigh in.

When Insurers Say ‘No’ – Know Your Dispute Options
Disagreements about the effect of pre-existing conditions are one of the most common reasons for claim denial or reduction. If you believe you’re being treated unfairly, legal support can make all the difference. At this stage, your lawyer can request a review, arrange for independent expert opinions, and lodge an application with the Commission or relevant court. Many insurers will reconsider their position when faced with a clear, evidence-based response.
Sometimes the process must proceed to a conference or mediation, where an experienced lawyer’s negotiation skills can result in a much better settlement. Rarely, a formal hearing is necessary, but most disputes resolve before that stage.
Don’t Get Stuck In Red Tape, Contact McDonnell Schroder
Struggling with a compensation claim due to a pre-existing condition is difficult, but you don’t have to navigate it alone. The team at McDonnell Schroder specialises in these complex cases, cutting through red tape, assembling persuasive evidence, and driving successful outcomes.
Call us today on (02) 9622 1155 or fill out our online form for a free consultation. We’re here to guide you every step of the way.