The 20 Best Secondary Immunodeficiency (SID) Doctors Near Me in Ontario, CA

Find the Top Secondary Immunodeficiency (SID) Experts and Specialists

Last Updated: 04/28/2026

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MediFind found 22 doctor with experience in Secondary Immunodeficiency (SID) near Ontario, CA. Of these, 20 are Experienced, 1 are Advanced and 1 are Distinguished.

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22 providers found
    Distinguished in Secondary Immunodeficiency (SID)
    Distinguished in Secondary Immunodeficiency (SID)
    St. Michael's Hospital, 
    Toronto, ON, CA 

    Stephen Betschel practices practicing medicine in Toronto, Canada. Mr. Betschel is rated as a Distinguished expert by MediFind in the treatment of Secondary Immunodeficiency (SID). He is also highly rated in 6 other conditions, according to our data. His clinical expertise encompasses Angioedema, Hereditary Angioedema, Hives, and Common Variable Immune Deficiency.

    Advanced in Secondary Immunodeficiency (SID)
    Advanced in Secondary Immunodeficiency (SID)
    Hamilton, ON, CA 

    Susan Waserman practices practicing medicine in Hamilton, Canada. Ms. Waserman is rated as an Advanced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). She is also highly rated in 12 other conditions, according to our data. Her clinical expertise encompasses Anaphylaxis, Allergic Rhinitis, Asthma, and Hives.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    555 University Ave, 
    Toronto, ON, CA 

    Paul Nathan practices practicing medicine in Toronto, Canada. Mr. Nathan is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). He is also highly rated in 19 other conditions, according to our data. His clinical expertise encompasses High Blood Pressure in Infants, Metastatic Uveal Melanoma, Hodgkin Lymphoma, Acute Pain, and Nephrectomy.

    Learn about our expert tiers
    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Ottawa, ON, CA 

    Anne Huy-Pham practices practicing medicine in Ottawa, Canada. Ms. Huy-Pham is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). She is also highly rated in 2 other conditions, according to our data. Her clinical expertise encompasses Severe Combined Immunodeficiency (SCID), Togaviridae Disease, Chickenpox, and Piebaldism.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Toronto, ON, CA 

    Chaim Roifman practices practicing medicine in Toronto, Canada. Mr. Roifman is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). He is also highly rated in 9 other conditions, according to our data. His clinical expertise encompasses Severe Combined Immunodeficiency (SCID), ZAP70-Related Severe Combined Immunodeficiency, Primary Immunodeficiency (PID), Schwartz-Jampel Syndrome, and Bone Marrow Transplant.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Department Of Otolaryngology Head And Neck Surgery, 
    Toronto, ON, CA 

    Shireen Samargandy practices practicing medicine in Toronto, Canada. Ms. Samargandy is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). Her clinical expertise encompasses Sinusitis, Secondary Immunodeficiency (SID), NUT Carcinoma, Endoscopy, and Tissue Biopsy.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Hamilton, ON, CA 

    Paul Keith practices practicing medicine in Hamilton, Canada. Mr. Keith is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). He is also highly rated in 5 other conditions, according to our data. His clinical expertise encompasses Angioedema, Hereditary Angioedema, Hives, and Allergic Rhinitis.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Toronto, ON, CA 

    Anupreet Tumber practices practicing medicine in Toronto, Canada. Tumber is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). They are also highly rated in 5 other conditions, according to our data. Their clinical expertise encompasses X-Linked Congenital Stationary Night Blindness, Myoclonic Epilepsy, Bardet-Biedl Syndrome, and Dentatorubral-Pallidoluysian Atrophy.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Thunder Bay, ON, CA 

    Marina Ulanova practices practicing medicine in Thunder Bay, Canada. Ms. Ulanova is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). She is also highly rated in 1 other condition, according to our data. Her clinical expertise encompasses H Influenzae Meningitis, Strep Throat, Septic Arthritis, and Pseudomonas Stutzeri Infections.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Burlington, ON, CA 

    Nathalie Waser practices practicing medicine in Burlington, Canada. Ms. Waser is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). Her clinical expertise encompasses Cutaneous T-Cell Lymphoma (CTCL), T-Cell Lymphoma, Secondary Immunodeficiency (SID), and Non-Small Cell Lung Cancer (NSCLC).

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    955 Oliver Road, 
    Thunder Bay, ON, CA 

    William Mccready practices practicing medicine in Thunder Bay, Canada. Mr. Mccready is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). His clinical expertise encompasses Strep Throat and Secondary Immunodeficiency (SID).

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    155 College Street, 
    Toronto, ON, CA 

    Jason Pole practices practicing medicine in Toronto, Canada. Mr. Pole is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). He is also highly rated in 2 other conditions, according to our data. His clinical expertise encompasses Acute Lymphoblastic Leukemia (ALL), Leukemia, Hodgkin Lymphoma, Thyroidectomy, and Bone Marrow Transplant.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Department Of Otolaryngology Head And Neck Surgery, 
    Toronto, ON, CA 

    Eric Monteiro practices practicing medicine in Toronto, Canada. Mr. Monteiro is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). He is also highly rated in 3 other conditions, according to our data. His clinical expertise encompasses Olfactory Neuroblastoma, Sinusitis, Tonsillitis, Thyroidectomy, and Parathyroidectomy.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    155 College Street, 
    Toronto, ON, CA 

    Rinku Sutradhar practices practicing medicine in Toronto, Canada. Sutradhar is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). They are also highly rated in 12 other conditions, according to our data. Their clinical expertise encompasses Colorectal Cancer, Breast Cancer, Acute Lymphoblastic Leukemia (ALL), Mastectomy, and Colonoscopy.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Toronto, ON, CA 

    Elise Heon practices practicing medicine in Toronto, Canada. Ms. Heon is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). She is also highly rated in 21 other conditions, according to our data. Her clinical expertise encompasses Bardet-Biedl Syndrome, Late-Onset Retinal Degeneration, Retinitis Pigmentosa, and Retinopathy Pigmentary Mental Retardation.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    London, ON, CA 

    Rongbo Zhu practices practicing medicine in London, Canada. Zhu is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). Their clinical expertise encompasses Infectious Arthritis, Septic Arthritis, Asthma, and Secondary Immunodeficiency (SID).

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Toronto, ON, CA 

    Linda Vong practices practicing medicine in Toronto, Canada. Ms. Vong is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). She is also highly rated in 1 other condition, according to our data. Her clinical expertise encompasses Vitamin D Deficiency, Severe Combined Immunodeficiency (SCID), Viral Gastroenteritis, and Colitis.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    Department Of Otolaryngology Head & Neck Surgery, St. Michael's Hospital, 
    Toronto, ON, CA 

    Elysia Grose practices practicing medicine in Toronto, Canada. Ms. Grose is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). She is also highly rated in 1 other condition, according to our data. Her clinical expertise encompasses Sinusitis, Croup, Chronic Rhinosinusitis with Nasal Polyps (CRSwNP), Septoplasty, and Endoscopy.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    149 College Street, 
    Toronto, ON, CA 

    Ajoy Vincent practices practicing medicine in Toronto, Canada. Vincent is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). They are also highly rated in 16 other conditions, according to our data. Their clinical expertise encompasses X-Linked Congenital Stationary Night Blindness, Late-Onset Retinal Degeneration, Bardet-Biedl Syndrome, and Retinitis Pigmentosa.

    Experienced in Secondary Immunodeficiency (SID)
    Experienced in Secondary Immunodeficiency (SID)
    686 Bay Street, 
    Toronto, ON, CA 

    Lillian Sung practices practicing medicine in Toronto, Canada. Ms. Sung is rated as an Experienced expert by MediFind in the treatment of Secondary Immunodeficiency (SID). She is also highly rated in 15 other conditions, according to our data. Her clinical expertise encompasses Febrile Neutropenia, Infantile Neutropenia, Agranulocytosis, Bone Marrow Transplant, and Bone Marrow Aspiration.

    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 22

    Last Updated: 04/28/2026

    When should I see a Secondary Immunodeficiency (SID) 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 a Secondary Immunodeficiency (SID) 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 does MediFind rank Secondary Immunodeficiency (SID) 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 Secondary Immunodeficiency (SID) 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 a Secondary Immunodeficiency (SID) 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 Secondary Immunodeficiency (SID) doctor search results page. 

    Why is it important to get a second opinion from a different Secondary Immunodeficiency (SID) 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 a Secondary Immunodeficiency (SID) 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 Secondary Immunodeficiency (SID) 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 Secondary Immunodeficiency (SID) 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 Secondary Immunodeficiency (SID) doctors in Ontario, CA?

    Look for the filter feature on the left side of the Secondary Immunodeficiency (SID) 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 a Secondary Immunodeficiency (SID) doctor that offers video calls?

    Look for the filter feature on the left-side of the Secondary Immunodeficiency (SID) 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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