Old injury made worse in a NSW CTP claim: pre-existing condition guide
By Herman Chan, Stephen Young Lawyers | Published 2026-05-10
Yes, you may still be able to claim if a NSW motor accident made an old injury worse. A pre-existing back, neck, shoulder, knee, psychological, or other condition does not automatically defeat a CTP claim. The practical question is whether the crash caused a new injury, materially aggravated the old condition, or changed your symptoms, treatment needs, work capacity, or daily function. General information only, not legal advice.
The short answer
NSW CTP claims are not limited to people who were perfectly healthy before the crash. Many people have earlier degeneration, prior surgery, old sports injuries, chronic pain, anxiety, depression, or previous workplace injuries. What matters is the medical and factual comparison between your condition before and after the motor accident.
If the insurer says “this was pre-existing”, the answer is not simply to deny your history. The stronger response is usually to show what changed: new symptoms, increased severity, different pain pattern, reduced function, new imaging findings, extra treatment, more medication, time off work, or a loss of independence that was not present before the crash.
This issue often overlaps with disputes about whether treatment is accident-related, whether an injury is a threshold injury, and whether any lasting impairment should be assessed under the WPI pathway.
The source basis, in plain English
The Motor Accident Injuries Act 2017 (NSW) provides statutory benefits for death or injury resulting from a motor accident. For treatment and care, section 3.24 says benefits are payable for reasonable treatment and care expenses, but not to the extent that the treatment and care was not reasonable and necessary or did not relate to the injury resulting from the motor accident.
SIRA CTP treatment and rehabilitation guidance also frames reasonable and necessary treatment by asking whether the service is directly related to the injuries sustained in the motor accident. The Personal Injury Commission identifies medical disputes that can include whether treatment or care is reasonable and necessary and whether it relates to the injury caused by the accident.
That does not mean an insurer can reject a claim just by pointing to an old scan or past injury. It means the evidence needs to connect the current treatment, symptoms, and losses to the crash, and distinguish them from the earlier baseline where possible.
What “aggravation” usually means in a CTP claim
In everyday language, aggravation means the accident made an existing condition worse. In a claim file, the word is usually shorthand for a causation question: did the motor accident materially change the condition, symptoms, treatment need, or functional impact?
Examples that may support aggravation
- a pain-free or stable old injury became symptomatic after the crash
- symptoms became more frequent, severe, or widespread
- you needed new imaging, medication, injections, therapy, surgery review, or psychological care
- you had new work restrictions or reduced hours after the crash
- daily activities changed, such as driving, sleeping, lifting, walking, or caring responsibilities
Issues that can weaken the link
- long gaps before reporting symptoms
- records showing the same symptoms immediately before the crash
- inconsistent descriptions of onset or body area
- later non-accident events that explain the worsening
- treatment notes that do not mention the accident connection
Evidence that helps compare before and after
The best aggravation evidence is comparative. It does not pretend the old injury never existed. It explains the difference between your earlier baseline and your post-accident condition.
Medical records
- GP notes before and after the accident
- specialist letters and hospital records
- imaging reports and radiology requests
- physio, psychology, or rehab progress notes
Work and function records
- certificates of fitness
- rosters, payslips, and time off work
- modified duties or reduced hours
- statements about daily activity changes
Timeline evidence
- ambulance and emergency records
- first complaint dates for each body part
- symptom diary and medication changes
- referrals and treatment plan dates
If your certificates are unclear, review the guide to medical certificate requirements. If the insurer has arranged an examination, the IME guide explains what to expect.
How insurers commonly dispute old-injury claims
A pre-existing condition can affect different parts of a NSW CTP claim. The insurer might accept that an accident happened, but still dispute whether a particular treatment, body part, work restriction, or permanent impairment is caused by the crash.
Treatment and care
The insurer may say treatment is for degeneration or an older injury, not the motor accident injury. The response should usually focus on clinical reasoning: what diagnosis is being treated, why it changed after the accident, and why the proposed treatment is reasonable and necessary now.
If this happens, see the treatment refused dispute pathway.
Work capacity and income support
If you had an old injury but were working normally before the crash, work records can be powerful. They help show whether the accident, not just the historic condition, changed your earning capacity. Certificates should explain restrictions in practical work terms.
Broader benefit issues are explained in the CTP compensation guide.
Threshold injury
For physical injuries, disputes can arise about whether the accident caused more than a threshold injury. For psychological or psychiatric symptoms, the assessment also turns on diagnosis and causation. Do not assume the answer from the label “pre-existing”.
Read more in the threshold injury dispute guide.
Permanent impairment and damages
Where WPI or damages are in issue, medical assessors may need to consider what impairment is caused by the motor accident rather than the earlier condition. This can be technical and depends heavily on medical records, imaging, examination findings, and accepted assessment methods.
If WPI is disputed, start with the WPI dispute guide.
A practical way to present the issue
When writing to the insurer or preparing for a medical assessment, organise the issue as a timeline rather than an argument. A clear timeline is easier for doctors, insurers, and dispute decision-makers to test.
- Describe the old injury honestly, including diagnosis, treatment, and symptoms before the crash.
- Explain your actual baseline before the accident, including work, sport, driving, sleep, medication, and daily tasks.
- Record the accident mechanism and immediate symptoms, including ambulance, emergency, GP, or first treatment records.
- List what changed after the crash, with dates and supporting documents.
- Ask your treating doctor to explain whether the accident caused a new injury, aggravated the old condition, or accelerated treatment needs.
- Respond to insurer reasons directly, causation, reasonable and necessary treatment, amount, proof, threshold injury, or WPI.
If the insurer says it is all pre-existing
Ask for written reasons and identify the exact decision being made. Is the insurer refusing treatment, reducing weekly payments, disputing threshold injury, disputing WPI, or questioning damages? The right response depends on the decision type.
Then answer the real issue with evidence. If the insurer relies on an old scan, provide clinical records showing your pre-accident function. If the insurer says symptoms were delayed, explain the first complaint dates. If the insurer says treatment is not related, ask the treating provider to explain the link and why the treatment is reasonable and necessary.
FAQ
Can I make a NSW CTP claim if the crash made an old injury worse?
Yes, a pre-existing condition does not automatically stop a NSW CTP claim. The key issue is evidence. You need to show that the motor accident caused a new injury, materially aggravated an old injury, or made symptoms and treatment needs worse in a way that is connected to the crash.
What evidence helps prove aggravation of a pre-existing injury?
Useful evidence includes earlier GP and specialist records, imaging before and after the crash, ambulance or emergency notes, certificates of fitness, treatment plans, work records, symptom diaries, and a treating doctor explanation comparing your before and after function.
Will the insurer refuse treatment because I had the condition before?
The insurer may question causation, reasonableness, or necessity. Under the NSW CTP framework, treatment and care need to be reasonable and necessary and relate to the injury resulting from the motor accident. A clear clinical explanation can reduce this dispute.
Does an old injury affect the threshold injury or WPI assessment?
It can. Medical assessment issues may include whether the accident caused a non-threshold injury, whether symptoms are from the crash or from the earlier condition, and how any permanent impairment is assessed. These are medical evidence issues, not assumptions.
Should I hide my old injury from the CTP insurer?
No. Hiding a prior condition usually makes the claim harder and can damage credibility. A safer approach is to disclose it accurately, separate old symptoms from new or worsened symptoms, and provide records that explain the change after the accident.