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    Last Updated: 01/09/2026

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    MediFind found 74 doctor with experience in Atrial Septal Defect (ASD) near Ontario, CA. Of these, 57 are Experienced, 13 are Advanced and 4 are Distinguished.

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    74 providers found
      Distinguished in Atrial Septal Defect (ASD)

      Lee N. Benson
      Distinguished in Atrial Septal Defect (ASD)

      Lee N. Benson
      555 University Ave, 
      Toronto, ON, CA 

      Lee Benson practices in Toronto, Canada. Mr. Benson is rated as a Distinguished expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Coarctation of the Aorta, Atrial Septal Defect (ASD), Tetralogy of Fallot, Patent Foramen Ovale Repair, and Stent Placement.

      Distinguished in Atrial Septal Defect (ASD)

      Eric M. Horlick
      Distinguished in Atrial Septal Defect (ASD)

      Eric M. Horlick
      200 Elizabeth Street, M5G 2C4, 
      Toronto, ON, CA 

      Eric Horlick practices in Toronto, Canada. Mr. Horlick is rated as a Distinguished expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Atrial Septal Defect (ASD), Patent Foramen Ovale, Coarctation of the Aorta, Patent Foramen Ovale Repair, and Transcatheter Aortic Valve Replacement (TAVR).

      Distinguished in Atrial Septal Defect (ASD)

      Mark D. Osten
      Distinguished in Atrial Septal Defect (ASD)

      Mark D. Osten
      Toronto, ON, CA 

      Mark Osten practices in Toronto, Canada. Mr. Osten is rated as a Distinguished expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Atrial Septal Defect (ASD), Patent Foramen Ovale, Coarctation of the Aorta, Patent Foramen Ovale Repair, and Transcatheter Aortic Valve Replacement (TAVR).

      Learn about our expert tiers
      Distinguished in Atrial Septal Defect (ASD)

      Peter Juni
      Distinguished in Atrial Septal Defect (ASD)

      Peter Juni
      Toronto, ON, CA 

      Peter Juni practices in Toronto, Canada. Mr. Juni is rated as a Distinguished expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Acute Coronary Syndrome, Coronary Heart Disease, Heart Attack, Percutaneous Coronary Intervention (PCI), and Craniectomy.

      Advanced in Atrial Septal Defect (ASD)

      Luc L. Mertens
      Advanced in Atrial Septal Defect (ASD)

      Luc L. Mertens
      555 University Ave, 
      Toronto, ON, CA 

      Luc Mertens practices in Toronto, Canada. Mr. Mertens is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Tetralogy of Fallot, Atrioventricular Septal Defect, Hypoplastic Left Heart Syndrome (HLHS), Heart Transplant, and Kidney Transplant.

      Advanced in Atrial Septal Defect (ASD)

      Luciano A. Sposato
      Advanced in Atrial Septal Defect (ASD)

      Luciano A. Sposato
      London, ON, CA 

      Luciano Sposato practices in London, Canada. Mr. Sposato is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Stroke, Transient Ischemic Attack (TIA), Atrial Fibrillation, Thrombectomy, and Stent Placement.

      Advanced in Atrial Septal Defect (ASD)

      Sami M. Alnasser
      Advanced in Atrial Septal Defect (ASD)

      Sami M. Alnasser
      St. Michael's Hospital, 
      Toronto, ON, CA 

      Sami Alnasser practices in Toronto, Canada. Alnasser is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). Their top areas of expertise are Atrial Septal Defect (ASD), Tricuspid Regurgitation, Cardiogenic Shock, Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement.

      Advanced in Atrial Septal Defect (ASD)

      Ella Huszti
      Advanced in Atrial Septal Defect (ASD)

      Ella Huszti
      Toronto, ON, CA 

      Ella Huszti practices in Toronto, Canada. Ms. Huszti is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). Her top areas of expertise are Bronchiolitis Obliterans, Atrial Septal Defect (ASD), Swyer-James Syndrome, Lung Transplant, and Patent Foramen Ovale Repair.

      Advanced in Atrial Septal Defect (ASD)

      Laura Oliva
      Advanced in Atrial Septal Defect (ASD)

      Laura Oliva
      101 College Street, 
      Toronto, ON, CA 

      Laura Oliva practices in Toronto, Canada. Ms. Oliva is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). Her top areas of expertise are Atrial Septal Defect (ASD), Patent Foramen Ovale, Atrial Fibrillation, Stroke, and Patent Foramen Ovale Repair.

      Advanced in Atrial Septal Defect (ASD)

      Areeba H. Asghar
      Advanced in Atrial Septal Defect (ASD)

      Areeba H. Asghar
      London, ON, CA 

      Areeba Asghar practices in London, Canada. Ms. Asghar is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). Her top areas of expertise are Patent Foramen Ovale, Atrial Septal Defect (ASD), Stroke, Diarrhea, and Patent Foramen Ovale Repair.

      Advanced in Atrial Septal Defect (ASD)

      Rami M. Abazid
      Advanced in Atrial Septal Defect (ASD)

      Rami M. Abazid
      Sault Ste Marie, 
      ON, CA 

      Rami Abazid practices in Canada. Abazid is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). Their top areas of expertise are Coronary Artery Fistula, Coronary Heart Disease, Atrial Septal Defect (ASD), Coronary Artery Bypass Graft (CABG), and Heart Bypass Surgery.

      Advanced in Atrial Septal Defect (ASD)

      Jayant Kakarla
      Advanced in Atrial Septal Defect (ASD)

      Jayant Kakarla
      Toronto, ON, CA 

      Jayant Kakarla practices in Toronto, Canada. Mr. Kakarla is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Patent Foramen Ovale, Atrial Septal Defect (ASD), Tetralogy of Fallot, Familial Ventricular Tachycardia, and Cardiac Ablation.

      Advanced in Atrial Septal Defect (ASD)

      Selai Akseer
      Advanced in Atrial Septal Defect (ASD)

      Selai Akseer
      Toronto, ON, CA 

      Selai Akseer practices in Toronto, Canada. Akseer is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). Their top areas of expertise are Atrial Septal Defect (ASD), Patent Foramen Ovale, Pulmonary Hypertension, and Hypertension.

      Advanced in Atrial Septal Defect (ASD)

      Kanjana S. Perera
      Advanced in Atrial Septal Defect (ASD)

      Kanjana S. Perera
      Hamilton, ON, CA 

      Kanjana Perera practices in Hamilton, Canada. Perera is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). Their top areas of expertise are Stroke, Transient Ischemic Attack (TIA), Patent Foramen Ovale, Atrial Septal Defect (ASD), and Thrombectomy.

      Advanced in Atrial Septal Defect (ASD)

      Claudia Frankfurter
      Advanced in Atrial Septal Defect (ASD)

      Claudia Frankfurter
      Toronto, ON, CA 

      Claudia Frankfurter practices in Toronto, Canada. Ms. Frankfurter is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). Her top areas of expertise are Patent Foramen Ovale, Atrial Septal Defect (ASD), Heart Failure, Patent Foramen Ovale Repair, and Appendectomy.

      Advanced in Atrial Septal Defect (ASD)

      Mark A. Kotowycz
      Advanced in Atrial Septal Defect (ASD)

      Mark A. Kotowycz
      Barrie, ON, CA 

      Mark Kotowycz practices in Barrie, Canada. Mr. Kotowycz is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Atrial Septal Defect (ASD), Coronary Artery Aneurysm, Coronary Heart Disease, Spontaneous Coronary Artery Dissection (SCAD), and Percutaneous Coronary Intervention (PCI).

      Advanced in Atrial Septal Defect (ASD)

      David J. Barron
      Advanced in Atrial Septal Defect (ASD)

      David J. Barron
      555 University Ave, M5G 1X8, 
      Toronto, ON, CA 

      David Barron practices in Toronto, Canada. Mr. Barron is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Hypoplastic Left Heart Syndrome (HLHS), Pulmonary Atresia, Tetralogy of Fallot, Heart Transplant, and Patent Foramen Ovale Repair.

      Experienced in Atrial Septal Defect (ASD)

      Ashley Farrell
      Experienced in Atrial Septal Defect (ASD)

      Ashley Farrell
      Toronto, ON, CA 

      Ashley Farrell practices in Toronto, Canada. Farrell is rated as an Experienced expert by MediFind in the treatment of Atrial Septal Defect (ASD). Their top areas of expertise are Atrial Septal Defect (ASD), Patent Foramen Ovale, Myocarditis, Sarcoidosis, and Patent Foramen Ovale Repair.

      Experienced in Atrial Septal Defect (ASD)

      Christoffer Dharma
      Experienced in Atrial Septal Defect (ASD)

      Christoffer Dharma
      Toronto, ON, CA 

      Christoffer Dharma practices in Toronto, Canada. Mr. Dharma is rated as an Experienced expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Atrial Septal Defect (ASD), Patent Foramen Ovale, Asthma, Heart Bypass Surgery, and Aneurysm Repair.

      Experienced in Atrial Septal Defect (ASD)

      David Zeitoun-Messika
      Experienced in Atrial Septal Defect (ASD)

      David Zeitoun-Messika
      40 Ruskin Street, 
      Ottawa, ON, CA 

      David Zeitoun-Messika practices in Ottawa, Canada. Mr. Zeitoun-Messika is rated as an Experienced expert by MediFind in the treatment of Atrial Septal Defect (ASD). His top areas of expertise are Mitral Stenosis, Aortic Valve Stenosis, Mitral Valve Regurgitation, Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement.

      While we make every effort to provide the best results possible, data is currently limited outside of the United States. Doctors listed may include both clinicians and researchers, and individuals relocate frequently. We recommend contacting doctors directly to confirm their location and areas of focus. Contact information is provided when available. Learn more about our expert tiers.
      Showing 1-20 of 74

      Last Updated: 01/09/2026

      What is the definition of Atrial Septal Defect (ASD)?

      Atrial septal defect (ASD) is a heart defect that is present at birth (congenital).

      As a baby develops in the womb, a wall (septum) forms that divides the upper chamber into a left and right atrium. When this wall does not form correctly, it can result in a defect that remains after birth. This is called an atrial septal defect, or ASD.

      When should I see an Atrial Septal Defect (ASD) doctor in Ontario, CA?

      There are various reasons why you may want to see a specialist, such as: 

      • Your primary care provider recommends it. 
      • Your condition requires expert knowledge and specialized care. 
      • Your symptoms persist or worsen despite treatment. 
      • You need specialized testing or procedures. 
      • You want a second opinion.  

      What should I consider when choosing an Atrial Septal Defect (ASD) doctor in Ontario, CA?

      It’s important to see a provider with expertise in your specific condition. Each provider profile in MediFind’s doctor database includes information on which conditions they treat, years of experience, research contributions, languages spoken, insurance plans accepted, and more.  

      How do I find the best Atrial Septal Defect (ASD) doctor in Ontario, CA?

      You can find an Atrial Septal Defect (ASD) doctor in any of the 10 largest U.S. cities by clicking below:

      Atrial Septal Defect (ASD) doctor near New York, NY
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      Atrial Septal Defect (ASD) doctor near Philadelphia, PA
      Atrial Septal Defect (ASD) doctor near Atlanta, GA
      Atrial Septal Defect (ASD) doctor near Boston, MA
      Atrial Septal Defect (ASD) doctor near Dallas, TX
      Atrial Septal Defect (ASD) doctor near San Jose, CA

      How does MediFind rank Atrial Septal Defect (ASD) doctors in Ontario, CA?

      MediFind’s rankings are based on a variety of data sources, such as the number of articles a doctor has published in medical journals, participation in clinical trials and industry conferences, as well as the number of patients that provider sees for a given condition. Note that MediFind’s provider database is not based on user reviews, and providers do not pay to be included in the database. 

      What types of insurance are accepted by Atrial Septal Defect (ASD) doctors in Ontario, CA?

      Most profiles in MediFind’s doctor database include a list of insurance plans accepted by that provider. However, it’s a good idea to contact the provider’s office to make sure they still accept your insurance, then doublecheck by contacting your insurance plan to confirm they’re in network. 

      How can I book an appointment online with an Atrial Septal Defect (ASD) doctor in Ontario, CA?

      MediFind offers direct scheduling for certain providers using the “Request Appointment” button on that provider’s profile. If the schedule option is not available for a provider, tap the red “Show Phone Number” button on their profile to get their contact information. If you prefer to find providers who offer online scheduling, select “Schedules online” under the “Availability” category of the filter feature on the left side of the Atrial Septal Defect (ASD) doctor search results page. 

      Why is it important to get a second opinion from a different Atrial Septal Defect (ASD) doctor?

      Second opinions are an opportunity to confirm a diagnosis and its root cause, learn about alternative treatment options, or simply gain peace of mind. Many people, especially those with serious diagnoses, get second opinions so they can understand all their options and make informed decisions, so don’t hesitate to get one if you have any doubts or need more information or clarification regarding your care. Note that some insurance plans require second opinions, while others don’t cover second opinions, so be sure to confirm with your insurance provider first.   

      How can I prepare for my appointment with an Atrial Septal Defect (ASD) doctor in Ontario, CA?

      Prepare for your appointment by gathering the following items: 

      • Copies of medical records (dating back at least one year) 
      • Your medical history, including illnesses, medical conditions, surgeries, and other doctors you see 
      • Family history of disease 
      • List of current prescription drugs, over-the-counter medicines, vitamins, and herbal remedies or supplements including names and doses 
      • Allergies to medications, food, latex, insects, etc.  
      • List of questions and concerns 
      • Your insurance card 

      You might also contact the provider’s office to see if they offer transportation or childcare services or if you’re allowed to bring a loved one for support or to take notes during your visit. 

      What questions should I ask my Atrial Septal Defect (ASD) doctor?

      Here are some sample questions: 

      • Can you explain in simple terms what this condition is and how it’s treated? 
      • What symptoms or side effects should I watch for? 
      • What tests will be involved, and when can I expect results? 
      • Are there other specialists I need to see? 
      • What’s the best way to reach you if I have follow-up questions? 

      How can I learn about the latest clinical trials and research advances my Atrial Septal Defect (ASD) doctor may know about?

      MediFind’s Clinical Trials tool asks you a series of questions to help you narrow down your search by health condition, age, gender, location, how far you’re willing to travel, and more. Each question you answer filters down the number of trials until you find the ones that are most relevant to you. 

      MediFind’s Latest Advances tool features summaries of recent articles published in medical journals. We use cutting-edge technology to scour medical publication databases for the latest research advancements on any given condition, then we simplify this information in a way that’s useful and easy to understand. 

      Can I filter my search to show male or female Atrial Septal Defect (ASD) doctors in Ontario, CA?

      Look for the filter feature on the left side of the Atrial Septal Defect (ASD) doctor search results page. Select “Female” or “Male” under the “Gender” category to search for female or male providers exclusively. If the “Any” option is selected, it will pull results for both male and female providers. 

      Can I filter my search to find an Atrial Septal Defect (ASD) doctor that offers video calls?

      Look for the filter feature on the left-side of the Atrial Septal Defect (ASD) doctor search results page. Select “Offers telehealth visits” under the Availability category to search for providers who offer virtual appointments (video calls). 

      Reviewed on: 11/11/24  

      By: MediFind Medical Staff 

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