Best Misdiagnosis Lawyers in Ontario (2026)

The misdiagnosis lawyers in Ontario we'd call first, drawn from every city list we've published there and the firms whose own work shows these cases.

Sources checked November 7, 2026

5 lawyers and firms

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The short answer

Our featured firm in Ontario is Diamond & Diamond Lawyers LLP. Diamond & Diamond Lawyers LLP is our featured partner in Ontario and is listed first. Of the 20 firms that show misdiagnosis work on our 14 city lists in Ontario, Paul Cahill scores highest on malpractice focus, published results, client reviews and experience, followed by Sommers Roth & Elmaleh and Gluckstein LLP. Each firm keeps its best score from the cities it serves; open a city for its full list.

Best Misdiagnosis Lawyers in Ontario

Featured
1
Diamond & Diamond Lawyers LLP
Jeremy Syrtash
Jeremy Syrtash leads the medical malpractice litigation practice at Diamond & Diamond Lawyers LLP. He earned a BA from Yeshiva University (2010) and a JD from the University of Ottawa (2013), was called to the Bar of Ontario in 2014, and has acted as counsel and co-counsel in medical malpractice cases across Canada, many involving pediatric and obstetrical negligence.
Called to the Bar of Ontario, 2014 · JD, University of Ottawa · Best Lawyers: Ones to Watch in Canada, Health Care Law (2024 to 2027)
Free case review 1-800-567-HURT Website
2
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.
On our lists for Toronto, Mississauga, Brampton and Hamilton.
Call Website Free case review Is this your firm?
How they were picked
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
Sommers Roth & Elmaleh
Best for: Missed diagnoses during pregnancy
The result Sommers Roth & Elmaleh publishes directly concerns missed diagnosis. After a family physician failed to provide conventional pregnancy screening and monitoring, it reports over $6 million over a lifetime.
On our list for Mississauga.
Website Free case review Is this your firm?
How they were picked
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
4
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.
On our lists for Toronto, Mississauga, Brampton and Ottawa.
Call Website Free case review Is this your firm?
How they were picked
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
5
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.
On our lists for Toronto, Mississauga, Brampton and Hamilton.
Call Website Free case review Is this your firm?
How they were picked
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

What clients say about misdiagnosis lawyers in Ontario

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.

David K.
November 2025 · Mississauga, Ontario
“Jim Davidson and his team at his firm are very experienced and professional in what they do. They cut no corners and handled my case with professionalism. He put me at ease throughout the legal process and showed me consistent support through my case. I highly recommend Jim and his team at Davidson Cahill Morrison LLP.”
About Davidson Cahill Morrison LLPGoogle reviewRead it on Google
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
Joanna C.
October 2026 · Markham, Ontario
“I can’t say enough good things about Dana! From the beginning, she has been kind, empathetic, and incredibly clear in her communication. I never feel like I’m left in the dark or unsure of what’s happening with my case, which has made such a difference throughout the entire process. Navigating an accident benefits...”
About Reyes Tam LawGoogle reviewRead it on Google

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How a malpractice claim usually moves in Ontario

1.Something went wrong
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3.Free case review
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4.Medical opinion
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5.Start the claim in time
Your lawyer starts the claim before the deadline.
6.Settlement or trial
Many claims settle. Some go to a judge or jury.

Misdiagnosis Lawyers by city in Ontario

Photos: Toronto, Dillan Payne, CC BY-SA 4.0; Ottawa, No machine-readable author provided. Arctic.gnome assumed (based on copyright cl, CC BY 2.5; Mississauga, The Eloquent Peasant, CC BY 4.0; Brampton, Peter K Burian, CC BY-SA 4.0; Hamilton, AI-generated image; London, Mcalpinestudios, CC BY-SA 4.0; Markham, Mhsheikholeslami, CC BY-SA 4.0; Vaughan, Dillan Payne, CC BY-SA 4.0; Oakville, Canmenwalker, CC BY 4.0; Richmond Hill, Raysonho @ Open Grid Scheduler / Scalable Grid Engine, CC0. Via Wikimedia Commons.

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