The 20 Best Atrial Septal Defect (ASD) Doctors Near Me in Ontario, CA

Find the Top Atrial Septal Defect (ASD) Experts and Specialists

Last Updated: 04/28/2026

Save doctors for later
Sign Up
Not sure about your diagnosis?
Check Your Symptoms
Already have a doctor?
Find A Second Opinion

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.

Location
LocationClose
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 practicing medicine in Toronto, Canada. Mr. Benson is rated as a Distinguished expert by MediFind in the treatment of Atrial Septal Defect (ASD). He is also highly rated in 12 other conditions, according to our data. His clinical expertise encompasses 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 practicing medicine in Toronto, Canada. Mr. Horlick is rated as a Distinguished expert by MediFind in the treatment of Atrial Septal Defect (ASD). He is also highly rated in 11 other conditions, according to our data. His clinical expertise encompasses 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 practicing medicine in Toronto, Canada. Mr. Osten is rated as a Distinguished expert by MediFind in the treatment of Atrial Septal Defect (ASD). He is also highly rated in 5 other conditions, according to our data. His clinical expertise encompasses 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
    Li Ka Shing Knowledge Institute Of St Michael's Hospital, 
    Toronto, ON, CA 

    Peter Juni practices practicing medicine in Toronto, Canada. Mr. Juni is rated as a Distinguished expert by MediFind in the treatment of Atrial Septal Defect (ASD). He is also highly rated in 20 other conditions, according to our data. His clinical expertise encompasses Acute Coronary Syndrome, Coronary Heart Disease, Heart Attack, Percutaneous Coronary Intervention (PCI), and Patent Foramen Ovale Repair.

    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 practicing medicine in Toronto, Canada. Mr. Mertens is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). He is also highly rated in 27 other conditions, according to our data. His clinical expertise encompasses 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 practicing medicine in London, Canada. Mr. Sposato is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). He is also highly rated in 7 other conditions, according to our data. His clinical expertise encompasses Stroke, Transient Ischemic Attack (TIA), Atrial Fibrillation, Thrombectomy, and Stent Placement.

    Advanced in Atrial Septal Defect (ASD)

    Laura Oliva
    Advanced in Atrial Septal Defect (ASD)

    Laura Oliva
    Toronto, ON, CA 

    Laura Oliva practices practicing medicine in Toronto, Canada. Ms. Oliva is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). She is also highly rated in 3 other conditions, according to our data. Her clinical expertise encompasses Atrial Septal Defect (ASD), Patent Foramen Ovale, Atrial Fibrillation, Stroke, and Patent Foramen Ovale Repair.

    Advanced in Atrial Septal Defect (ASD)

    Ella Huszti
    Advanced in Atrial Septal Defect (ASD)

    Ella Huszti
    Mount Sinai Hospital, 
    ON, CA 

    Ella Huszti practices practicing medicine in Canada. Ms. Huszti is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). She is also highly rated in 6 other conditions, according to our data. Her clinical expertise encompasses Bronchiolitis Obliterans, Atrial Septal Defect (ASD), Swyer-James Syndrome, Lung Transplant, and Patent Foramen Ovale Repair.

    Advanced in Atrial Septal Defect (ASD)

    Areeba Asghar
    Advanced in Atrial Septal Defect (ASD)

    Areeba Asghar
    London, ON, CA 

    Areeba Asghar practices practicing medicine in London, Canada. Ms. Asghar is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). She is also highly rated in 3 other conditions, according to our data. Her clinical expertise encompasses Atrial Septal Defect (ASD), Patent Foramen Ovale, 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 practicing medicine in Canada. Abazid is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). They are also highly rated in 6 other conditions, according to our data. Their clinical expertise encompasses Coronary Artery Fistula, Atrial Septal Defect (ASD), Coronary Heart Disease, Heart Bypass Surgery, and Coronary Artery Bypass Graft (CABG).

    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 practicing medicine in Toronto, Canada. Alnasser is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). They are also highly rated in 2 other conditions, according to our data. Their clinical expertise encompasses Atrial Septal Defect (ASD), Tricuspid Regurgitation, Mitral Stenosis, Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement.

    Advanced in Atrial Septal Defect (ASD)

    Jayant Kakarla
    Advanced in Atrial Septal Defect (ASD)

    Jayant Kakarla
    Toronto, ON, CA 

    Jayant Kakarla practices practicing medicine in Toronto, Canada. Mr. Kakarla is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). He is also highly rated in 3 other conditions, according to our data. His clinical expertise encompasses Patent Foramen Ovale, Atrial Septal Defect (ASD), Tetralogy of Fallot, Familial Ventricular Tachycardia, and Cardiac Ablation.

    Advanced in Atrial Septal Defect (ASD)

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

    Kanjana S. Perera
    Hamilton, ON, CA 

    Kanjana Perera practices practicing medicine in Hamilton, Canada. Perera is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). They are also highly rated in 5 other conditions, according to our data. Their clinical expertise encompasses 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 practicing medicine in Toronto, Canada. Ms. Frankfurter is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). She is also highly rated in 3 other conditions, according to our data. Her clinical expertise encompasses 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 practicing medicine in Barrie, Canada. Mr. Kotowycz is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). He is also highly rated in 1 other condition, according to our data. His clinical expertise encompasses 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)

    Selai Akseer
    Advanced in Atrial Septal Defect (ASD)

    Selai Akseer
    Toronto, ON, CA 

    Selai Akseer practices practicing medicine in Toronto, Canada. Akseer is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). They are also highly rated in 1 other condition, according to our data. Their clinical expertise encompasses Atrial Septal Defect (ASD), Patent Foramen Ovale, Pulmonary Hypertension, and Hypertension.

    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 practicing medicine in Toronto, Canada. Mr. Barron is rated as an Advanced expert by MediFind in the treatment of Atrial Septal Defect (ASD). He is also highly rated in 23 other conditions, according to our data. His clinical expertise encompasses Tetralogy of Fallot, Hypoplastic Left Heart Syndrome (HLHS), Transposition of the Great Arteries, 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 practicing medicine in Toronto, Canada. Farrell is rated as an Experienced expert by MediFind in the treatment of Atrial Septal Defect (ASD). Their clinical expertise encompasses 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 practicing medicine in Toronto, Canada. Mr. Dharma is rated as an Experienced expert by MediFind in the treatment of Atrial Septal Defect (ASD). His clinical expertise encompasses Atrial Septal Defect (ASD), Patent Foramen Ovale, Stridor, 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 practicing medicine in Ottawa, Canada. Mr. Zeitoun-Messika is rated as an Experienced expert by MediFind in the treatment of Atrial Septal Defect (ASD). He is also highly rated in 12 other conditions, according to our data. His clinical expertise encompasses 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: 04/28/2026

    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
    Atrial Septal Defect (ASD) doctor near Los Angeles, CA
    Atrial Septal Defect (ASD) doctor near Chicago, IL
    Atrial Septal Defect (ASD) doctor near Houston, TX
    Atrial Septal Defect (ASD) doctor near Phoenix, AZ
    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 

    Read more about our Content Policy.