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Malpractice Center

Best Misdiagnosis Lawyers in Toronto, ON (2026)

For this 2026 ranking of Toronto misdiagnosis lawyers, we weigh practice focus against published results. We also weigh client reviews and each lawyer's professional record.

Sources checked

5 lawyers and firms

Toronto skyline viewed from Snake Island
Photo: Dillan Payne, CC BY-SA 4.0, via Wikimedia Commons

The short answer

Our featured firm in Toronto is Diamond & Diamond Lawyers LLP, where Jeremy Syrtash leads the medical malpractice group. Among the firms we reviewed, Paul Cahill stands out. Medical negligence accounts for much of the practice, which has published trial results. You'll want to check the fees and who would handle your diagnosis claim before calling. Ask the firm to assess your limitation period promptly. Don't put that off. Our Ontario malpractice guide explains the rules that apply in the province.

At a glance

  1. 1Diamond & Diamond Lawyers LLPJeremy SyrtashFeatured
  2. 2Paul Cahill4.8 out of 5
  3. 3Gluckstein LLPFree consultation4.8 out of 5
  4. 4Thomson Rogers LLPFree consultation4.8 out of 5
  5. 5Howie, Sacks & HenryFree consultation4.8 out of 5

Best Misdiagnosis Lawyers in Toronto

  1. Featured
  2. Paul Cahill logo2

    Paul Cahill

    4.816 Google reviewsRated 4.8 out of 5 on Google from 16 reviews

    Best for: Diagnosis claims involving emergency care

    Paul Cahill - Medical Malpractice Lawyer has published a successful trial verdict against an emergency room physician. The case involved the death of a mother aged 34. The firm also has an $11.5 million birth injury jury verdict, another result behind its placement at the top of this list.

    CallWebsiteFree case reviewIs this your firm?
    How they were picked

    Stood out in our review for the recognition it has earned and how much of its work is medical malpractice.

    We order firms by how much of their work is medical malpractice, the results they publish, what their clients say, their experience, their standing with the regulator and the recognition they have earned, all from public records and the firms' own sites. How lists are made

  3. Gluckstein LLP logo3

    Gluckstein LLP

    4.8168 Google reviewsRated 4.8 out of 5 on Google from 168 reviews

    Best for: Clients valuing long-established firms

    Gluckstein Lawyers has been operating since 1962. That's a long history for a firm. Its site lists misdiagnosis among its medical negligence niches; senior counsel Richard Halpern and managing partner Charles E. Gluckstein are among its lawyers.

    CallWebsiteFree case reviewIs this your firm?
    How they were picked

    Stood out in our review for its years of experience and the recognition it has earned.

    We order firms by how much of their work is medical malpractice, the results they publish, what their clients say, their experience, their standing with the regulator and the recognition they have earned, all from public records and the firms' own sites. How lists are made

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    Tell us what happened. A malpractice lawyer who serves Toronto can look at it with you, and it costs nothing.

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  5. Thomson Rogers LLP logo4

    Thomson Rogers LLP

    4.8299 Google reviewsRated 4.8 out of 5 on Google from 299 reviews

    Best for: Clients seeking appellate litigation experience

    The Court of Appeal upheld a medical malpractice success that Thomson Rogers LLP reports in Denman v. Radovanovic, 2024 ONCA 276. That case was litigated. It doesn't tell you how your own misdiagnosis claim might turn out.

    CallWebsiteFree case reviewIs this your firm?
    How they were picked

    Stood out in our review for its years of experience and what its clients say.

    We order firms by how much of their work is medical malpractice, the results they publish, what their clients say, their experience, their standing with the regulator and the recognition they have earned, all from public records and the firms' own sites. How lists are made

  6. Howie, Sacks & Henry logo5

    Howie, Sacks & Henry

    4.8349 Google reviewsRated 4.8 out of 5 on Google from 349 reviews

    Best for: Clients prioritising supportive communication

    In reviews of Howie, Sacks & Henry LLP, clients repeatedly say they received patient explanations and felt supported. You'll find those comments throughout the firm's 349 Google reviews. But one client raises serious concerns about the firm's handling of their case.

    CallWebsiteFree case reviewIs this your firm?
    How they were picked

    Stood out in our review for the recognition it has earned and what its clients say.

    We order firms by how much of their work is medical malpractice, the results they publish, what their clients say, their experience, their standing with the regulator and the recognition they have earned, all from public records and the firms' own sites. How lists are made

Where they are in Toronto

What clients say about these Toronto lawyers

Google reviews of the firms on our lists, quoted as their clients wrote them and linked to where they were posted. We don't write, edit or pick reviews for pay.

  • Zoha

    July 2026 · Toronto, Ontario

    “​I want to formally express my deepest gratitude to Michelle Kudlats and the team at Neinstein Personal Injury Lawyers for their incredible support. As a young pedestrian who survived a motor vehicle accident, I was terrified and dealing with a situation I had never faced before. I was frantic, confused, and had no...”

    About Neinstein LLPGoogle reviewRead it on Google

  • Shamickia F.

    October 2026 · Toronto, Ontario

    “I had the absolute pleasure of working with Mrs. Veena Gupta and her wonderful team at Nanda & Associates throughout my refugee claim and permanent residency application process. Mrs. Gupta’s exceptional knowledge, professionalism, guidance, and dedication made my immigration journey so much easier. No matter what...”

    About Nanda & Associate LawyersGoogle reviewRead it on Google

  • Kate I.

    July 2026 · Toronto, Ontario

    “⭐⭐⭐⭐⭐ I cannot recommend Jennifer Ilton and Yoni Silberman of Bogoroch & Associates LLP highly enough. After our serious motor vehicle collision on Highway 400 North in November 2023, they stood by us every step of the way. They fought diligently to protect our insurance rights while also providing something just...”

    About Bogoroch & Associates LLPGoogle reviewRead it on Google
See all reviews
How a malpractice claim usually moves in Ontario

  1. 1.Something went wrong

    Write down dates and names while they're fresh.

  2. 2.Get your records

    Ask for your full chart and test results.

  3. 3.Free case review

    A lawyer looks at what happened, free.

  4. 4.Medical opinion

    A doctor checks whether the care fell short.

  5. 5.Start the claim in time

    Your lawyer starts the claim before the deadline.

  6. 6.Settlement or trial

    Many claims settle. Some go to a judge or jury.

Your deadline: 2 years from when you found outRead the Ontario law guide

Malpractice claims in Toronto: the rules that matter

The filing deadline in Ontario
  1. The clock startsWhen you found out, or should have
  2. Time to start a claim2 yearsMiss it and the claim is usually lost.
  3. At the very most15 yearsafter the treatment, with a few exceptions
Limits on damages in Ontario
  • Pain and sufferingCapped at about $484,330
  • All damages togetherNo overall cap
  • Expert paperworkNo affidavit or certificate of merit is required to start a claim.

Read the Ontario law guideWork out your own deadline

Basic limitation period in Ontario
2 years
Source
Ultimate limitation period
15 years
Source

Choosing a Toronto misdiagnosis lawyer

The diagnosis problem comes first. Reputation alone is a secondary consideration. Neinstein Medical Malpractice Lawyers handles medical malpractice exclusively. Several other firms here include that work within a broader injury practice. Find out who would assess your claim. Then ask what experience that lawyer has with the condition involved. A birth injury verdict doesn't establish a record in delayed diagnosis.

Make the first conversation useful

  1. Describe the timeline

    Give the lawyer your care dates and the diagnosis you received. Follow with the diagnosis change's timing. Find out which medical records the lawyer wants to review. Be clear about anything you can't remember. If you don't remember a date, say so.

  2. Ask about the medical assessment

    To start a claim in Ontario, you don't need an affidavit or certificate of merit. You'll still need expert reports. Reports addressing the standard of care and causation must be served under the court's rules, so ask how the firm would assess those issues in your case.

  3. Set communication expectations

    Find out who'll take your calls. You'll also want to ask how you'll get updates. Good communication comes up often in reviews across this list. Some reviewers, however, report intake delays or missed follow-up. Ask what happens if the firm declines your case.

Clarify costs before signing

You'll start with a free consultation discussion. The firm hasn't committed to taking your case by meeting you. With contingency fees, the legal fee depends on the outcome. Other possible expenses aren't fully explained by that label. Ask for the written agreement and an explanation of when payment would be due. Ask who would pay for expert reports if your claim doesn't succeed, as well as how those costs are handled.

  • A promised outcome is a red flag. Your claim's outcome can't be predicted from published verdicts. They describe what happened in earlier cases.
  • A deadline calculation needs an explanation before you accept it. Find out why the lawyer chose that discovery date.
  • Look for patterns in reviews. Review feedback isn't proof of results in diagnosis cases; treat it separately.

This general information isn't legal advice for you. An Ontario lawyer can assess your circumstances before you make a decision about proceeding.

Questions people ask

Who leads this Toronto misdiagnosis lawyer list?
The list starts with Paul Cahill - Medical Malpractice Lawyer. Of its practice, 80% is medical negligence. Misdiagnosis and delayed diagnosis are both listed among the areas it handles. Its published trial results cover birth injury as well as negligence in the emergency room. Those are earlier cases. Ask what experience the firm has with your particular diagnosis before you decide to hire it.
How long do I have to start a misdiagnosis claim in Ontario?
The basic limitation period is two years from discovery. The treatment date isn't automatically the start of that clock. Discovery involves knowing, or reasonably being expected to know, that you were injured and that a health care provider contributed to it, as well as that a lawsuit was appropriate. There's also an ultimate limitation period in Ontario: 15 years. For an assessment of your dates and the rules, consult an Ontario lawyer.
Does the limitation period work differently for a child?
Yes. While the claimant is under 18 without a litigation guardian for the claim, the two-year period doesn't run. For a claim arising when the claimant is a minor without a litigation guardian, the 15-year ultimate period is suspended too. The rule is addressed in Wong v. Lui, 2023 ONCA 272. For advice on how the rule affects your child, consult an Ontario lawyer.
Do I need an expert report before starting an Ontario malpractice claim?
Ontario doesn't require an affidavit or certificate of merit to start the claim. Under the court's rules, you'll still have to serve expert reports addressing the standard of care and causation. Find out how the lawyer would assess those medical issues. Report costs need discussion, too. Although there's no initial certificate requirement, you'll still need expert reports.
Are damages capped in an Ontario misdiagnosis case?
Economic losses, including lost income or future care, aren't subject to a statutory cap. Non-pecuniary damages have a different rule, the national judge-made trilogy cap. Your claim's value isn't established by a firm's verdict or negotiated resolution in an earlier case. An Ontario lawyer can explain which losses may apply to your circumstances and how the cap affects the assessment.

Sources

  1. Limitations Act, 2002, S.O. 2002, c. 24, Sched. B, Government of Ontario (e-Laws)
  2. Claims from minors and the 15-year ultimate limitation period in Ontario, Borden Ladner Gervais LLP
  3. Non-Pecuniary Damages Upper Limits (monthly indexed figures, 2024 to 2026), McKellar Structured Settlements
  4. Key Numbers for 2025 (trilogy cap and indexation), McCague Borlack LLP
  5. Malpractice Center methodology, Malpractice Center

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