If a doctor commits medical malpractice while treating your Ontario workplace injury, the WSIB generally considers the worsened condition as an “aggravation” and will cover it under your existing claim. However, because doctors are usually third parties, you must make a critical “Election” to either accept the expanded WSIB benefits or surrender them to pursue a civil lawsuit against the surgeon.
Sustaining a severe injury at work is traumatic enough. But what happens if the surgery approved by the Workplace Safety and Insurance Board (WSIB) goes wrong? As of 2026, patients in Ontario sometimes face devastating setbacks due to surgical errors, misdiagnoses, or hospital infections while being treated for a workplace accident. For example, a construction worker from Mississauga might need a simple knee scope for a site injury, only to have a surgeon’s negligence result in permanent nerve damage.
When medical malpractice intersects with the WSIB, the legal rules become incredibly complex. The original injury was the employer’s responsibility, but the subsequent aggravation was caused by an independent doctor. You cannot “double-dip” and get paid by both the WSIB and the doctor’s insurance for the same injury. You will be forced to choose your legal path. Because making the wrong choice can cost you hundreds of thousands of dollars in future support, we strongly advise consulting an experienced personal injury and WSIB lawyer from our directory immediately. ⚠️
Step-by-Step Process in Ontario
Navigating an aggravation caused by medical treatment requires careful reporting to the WSIB and a strategic legal decision. Here is the process injured workers must follow. 📍
Step 1: Get Emergency Corrective Treatment
If a surgery goes wrong or a cast is applied incorrectly causing severe damage, seek emergency medical care to stabilize your health.
Do not wait for WSIB approval to fix a life-threatening or severe medical error. Go to a different hospital or specialist if necessary. Ensure the new treating doctors clearly document that the current damage was a direct result of the previous medical procedure.
Step 2: Report the Aggravation to Your Case Manager
You must inform your WSIB Case Manager that your condition has worsened due to the medical treatment. The WSIB calls this a “secondary condition” or a “clinical aggravation.” 📱
Under WSIB policy, if you are undergoing treatment for an approved injury, the WSIB accepts responsibility for the outcome of that treatment. They will generally expand your claim to cover the new restrictions and any extended time you need off work.
Step 3: Receive the WSIB Election Form
Because the doctor or hospital that caused the malpractice is likely an independent “third party” (not your employer), the WSIB will send you a Form 8 (Election Form).
This is the most critical document in your case. You must legally elect whether to claim WSIB benefits for the worsened condition OR to sue the doctor in civil court. You generally have three months from the date of the malpractice to make this decision.
Step 4: Consult a Specialized Lawyer
Do not sign the Election Form without independent legal advice. You need a lawyer who understands both medical malpractice and the Workplace Safety and Insurance Act (WSIA). 💼
Your lawyer will calculate which path offers more money. WSIB pays 85% of your net earnings (up to a cap) and a small Non-Economic Loss (NEL) award. A civil lawsuit against a doctor can yield massive payouts for pain and suffering, but it is incredibly difficult to win and can take years.
Step 5: Execute the Election
If you elect WSIB benefits, the WSIB becomes “subrogated” to your rights. This means the WSIB takes over the right to sue the doctor to recover the money they are paying you.
If you elect to sue the doctor directly (de-electing WSIB), you will stop receiving WSIB LOE payments for the aggravation and must rely on your lawyer to win the civil case to replace your lost income.
How Much Does it Cost in Ontario?
The financial implications of this choice are massive, and the legal fees depend entirely on the path you choose. 💰
- WSIB Path: Electing to stay with WSIB is free. The WSIB will continue to pay your LOE benefits and cover the costs of corrective surgeries and physiotherapy.
- Civil Lawsuit Path: Medical malpractice is the most expensive type of civil litigation in Ontario. While lawyers usually work on a 30% to 33% contingency fee, the upfront costs for medical expert witnesses can easily exceed $50,000 CAD.
- Legal Consultation: Most personal injury lawyers in Ontario will review your Election Form and the malpractice details during a free initial consultation.
| Factor | Electing WSIB Benefits | Electing to Sue the Doctor |
|---|---|---|
| Financial Certainty | High. Guaranteed monthly LOE payments. | Low. You get nothing if you lose the trial. |
| Pain and Suffering Payout | Low. Limited to a small, statutory NEL award. | High. Civil courts award large sums for pain/suffering. |
| Speed of Payment | Fast. Bi-weekly payments continue immediately. | Slow. Can take 3 to 5 years to settle. |
How Long Does the Process Take?
If you elect to keep your WSIB benefits, updating your file to include the aggravation usually takes 3 to 6 weeks. The WSIB will simply extend your current LOE payments and approve the new physiotherapy plans. ⌛
If you choose to “de-elect” and sue the negligent doctor, you are in for a marathon. Due to complex medical evidence and backlogs in the Superior Court of Justice, a medical malpractice lawsuit in Ontario typically takes 3 to 5 years to reach a settlement or trial judgment.
Frequently Asked Questions (FAQ)
What if the WSIB forced me to see that specific doctor?
In Ontario, you generally have the right to choose your own treating physician. However, even if you utilized a WSIB-sponsored specialty clinic, the doctors are still considered independent medical professionals. The Election process to sue them or take benefits remains the same.
Can I sue my employer for sending me to a bad hospital?
No. Under the WSIA, you give up the right to sue your Schedule 1 employer for anything related to a workplace injury, including the medical aftermath. Your only recourse against the employer is receiving WSIB benefits.
What happens if the WSIB sues the doctor and wins a huge settlement?
If you elect WSIB benefits and the WSIB successfully sues the doctor (subrogation), the WSIB will first reimburse themselves for everything they paid you. If there is any surplus money left over from the lawsuit, the WSIB is legally required to hand that surplus over to you.
What if my 3-month deadline to elect is expiring?
If you need more time to consult with a medical malpractice lawyer, you can request an extension from the WSIB. If you fail to submit the Election Form in time, the WSIB may suspend your ongoing benefits until you make a formal choice.
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