Can a WSIB Claim Be Denied if Your Medical Records Don't Match?

Can a WSIB Claim Be Denied Even If a Workplace Accident Really Happened?

Yes — a workplace accident and a compensable workplace injury are two different things under Ontario law. The Tribunal in Decision No. 569/26, 2026 ONWSIAT 808 (CanLII) confirmed that even where an accident clearly occurred, a worker must still show that the accident caused or worsened a specific injury. If the medical record does not support that connection, the claim can be denied.

In this case, the Vice-Chair accepted that a pump truck handle broke and the worker fell. That was a real accident. But the evidence did not support that boxes of product fell on the worker’s shoulder and back as claimed — photos showed the boxes still wrapped and leaning against the trailer wall. The Tribunal found the worker could not adequately explain that gap.

What Role Do Medical Records Play in a WSIB Claim?

Medical records are often the most important evidence in a WSIB claim. Decision-makers look at whether the clinical notes, physiotherapy records, and physician reports are consistent with the accident history the worker describes.

In this case, the family physician’s records showed the worker had been seeking treatment for recurring low back pain for years before the accident, including a referral for physiotherapy that pre-dated the incident. There was no clinical note recording a new injury or a visit the day after the accident, despite the worker’s testimony that he had attended the clinic then. A Form 8 completed by the physician nearly seven months after the fact carried little weight without a contemporaneous clinical record to support it.

What Happens When a Worker’s Testimony Conflicts With Documents?

When testimony conflicts with documentary evidence, Tribunals generally give more weight to records created closer in time to the events in question. Contemporaneous records — notes made at the time of treatment, billing records, WSIB intake memos — are considered more reliable than recollections offered months or years later.

Here, the worker’s account conflicted with the medical records on several points: the date of the first doctor’s visit, who paid for physiotherapy, and the history of prior low back complaints. The physiotherapy records from September 2022 described the condition as chronic, with no mention of a workplace accident. The Tribunal placed greater weight on those documents.

Can a Pre-Existing Condition Still Support a WSIB Claim?

Yes, in the right circumstances. Ontario workers’ compensation law allows a claim where a workplace incident aggravates or accelerates a pre-existing condition. A worker does not need to be in perfect health before an accident to be entitled to benefits.

However, there must still be evidence linking the workplace event to a measurable change in the condition. In this case, the Tribunal found that neither the physician’s records nor the physiotherapy notes established that the August 2022 incident caused the worker’s condition to worsen. The first time the workplace accident was mentioned in the physiotherapy records was in late November 2022 — three months after the accident — when a new program of care was initiated.

What Is the Benefit of the Doubt in WSIB Claims?

The benefit of the doubt is a statutory protection for workers under the WSIA. It means that where the evidence on both sides of an issue is roughly equal in weight, the decision must go in favour of the worker.

This protection does not apply when the evidence clearly favours one side. In this case, the Tribunal found the documentary record weighed against the worker’s position, so the benefit of the doubt did not come into play. The principle is meaningful, but it is not a tie-breaker that can overcome a record that consistently points in the other direction.

How Does WSIAT Evaluate Credibility in a Workers’ Compensation Appeal?

WSIAT does not approach credibility the same way a civil court does. The focus is on whether the overall evidence — taken together — supports the claim on a balance of probabilities. Inconsistencies between testimony and records are noted and weighed, but the Tribunal is not required to find that a worker is dishonest. It may simply find that the documentary record is more reliable.

In this decision, the Vice-Chair noted multiple inconsistencies but did not make an explicit finding that the worker was being untruthful. The conclusion was that the evidence, as a whole, did not establish the injury claimed. Workers and employers alike should understand that the strength of a WSIB claim often depends on the quality and consistency of the paper trail.

If you are navigating a WSIB denial or appeal, our Ontario employment lawyers can help you understand what evidence matters and how the process works. For workers in the Hamilton and Burlington area, our Hamilton employment law team is available to discuss your situation.

Questions and Records to Discuss With a Lawyer

• What medical records exist from the period immediately before and after the accident, and do they mention the workplace incident?
• Were there any pre-existing conditions that a doctor or physiotherapist had documented before the accident date?
• Is there a gap between when the accident occurred and when medical treatment was first sought, and what explains that gap?
• Are there any inconsistencies between what was reported to the employer, the WSIB, and healthcare providers?
• What documentation exists to support that the accident caused a change in the worker’s condition?

If you have questions about a WSIB denial or want to understand your options after a workplace injury, reach out to UL Lawyers through /connect to discuss your own circumstances.

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This article is automated commentary on a public court decision and is for general information only — not legal advice. Decisions rely on facts unique to each case. If you are affected by a similar issue, contact a lawyer for advice specific to your situation.