The 20 Best Hyperthyroidism Doctors Near Me in ontario, CA

Find the Top Hyperthyroidism Experts and Specialists

Last Updated: 09/26/2026

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MediFind found 84 doctor with experience in Hyperthyroidism near ontario, CA. Of these, 72 are Experienced, 11 are Advanced and 1 are Distinguished.

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84 providers found
    Distinguished in Hyperthyroidism
    Endocrinology
    Distinguished in Hyperthyroidism
    Endocrinology
    Referral required

    Bashar Saad, M.D., Inc.

    630 N 13th Ave, 
    Upland, CA 
     (2.7 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Tony Kastoon is an Endocrinologist practicing medicine in Upland, California. Dr. Kastoon is rated as a Distinguished provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 20 other conditions, according to our data. His clinical expertise encompasses Thyroid Storm, Type 2 Diabetes (T2D), Hypothyroidism, and Hyperparathyroidism. Dr. Kastoon is board certified in American Board Of Internal Medicine. Dr. Kastoon is currently accepting new patients.

    Experienced in Hyperthyroidism
    Family Medicine
    Experienced in Hyperthyroidism
    Family Medicine

    Cucamonga Valley Medical Group, Inc.

    5562 Philadelphia St, 
    Chino, CA 
     (2.9 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Jesse Minguez is a primary care provider, practicing in Family Medicine in Chino, California. Dr. Minguez is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 49 other conditions, according to our data. His clinical expertise encompasses Familial Combined Hyperlipidemia, Xanthoma, Cirrhosis, and Alcoholic Neuropathy. Dr. Minguez is board certified in American Board Of Family Medicine. Dr. Minguez is currently accepting new patients.

    Experienced in Hyperthyroidism
    Family Medicine
    Experienced in Hyperthyroidism
    Family Medicine

    Cucamonga Valley Medical Group

    7777 Milliken Ave Ste 240, 
    Rancho Cucamonga, CA 
     (4.7 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Eric Bekemeier is a primary care provider, practicing in Family Medicine in Rancho Cucamonga, California. Dr. Bekemeier is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 18 other conditions, according to our data. His clinical expertise encompasses Obesity, Cirrhosis, Familial Combined Hyperlipidemia, and Xanthoma. Dr. Bekemeier is currently accepting new patients.

    Learn about our expert tiers
    Experienced in Hyperthyroidism
    Family Medicine
    Experienced in Hyperthyroidism
    Family Medicine

    9190 Haven Ave

    9190 Haven Ave Ste 102, 
    Rancho Cucamonga, CA 
     (4.7 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Ani Berberyan is a primary care provider, practicing in Family Medicine in Rancho Cucamonga, California. Dr. Berberyan is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. She is also highly rated in 11 other conditions, according to our data. Her clinical expertise encompasses Obesity, Axillary Nerve Dysfunction, Sciatica, and High Cholesterol. Dr. Berberyan is currently accepting new patients.

    Advanced in Hyperthyroidism
    Endocrinology
    Advanced in Hyperthyroidism
    Endocrinology
    Referral required

    Rubina Aqeel MD Inc.

    1183 E Foothill Blvd Ste 260, 
    Upland, CA 
     (2.9 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Rubina Aqeel is an Endocrinologist practicing medicine in Upland, California. Dr. Aqeel is rated as an Advanced provider by MediFind in the treatment of Hyperthyroidism. She is also highly rated in 29 other conditions, according to our data. Her clinical expertise encompasses Hyperthyroidism, Sheehan Syndrome, Hypopituitarism, and Isolated Hypogonadotropic Hypogonadism. Dr. Aqeel is currently accepting new patients.

    Advanced in Hyperthyroidism
    Endocrinology
    Advanced in Hyperthyroidism
    Endocrinology
    Referral required

    Inland Endocrine

    9471 Haven Ave, 
    Rancho Cucamonga, CA 
     (4.4 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Stuart Seigel is an Endocrinologist practicing medicine in Rancho Cucamonga, California. Dr. Seigel is rated as an Advanced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 15 other conditions, according to our data. His clinical expertise encompasses Type 2 Diabetes (T2D), Type 1 Diabetes (T1D), Thyroid Storm, and Low Testosterone. Dr. Seigel is board certified in American Board Of Internal Medicine. Dr. Seigel is currently accepting new patients.

    Advanced in Hyperthyroidism
    Endocrinology
    Advanced in Hyperthyroidism
    Endocrinology
    Referral required

    Inland Endocrine

    9471 Haven Ave, 
    Rancho Cucamonga, CA 
     (4.4 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Jodi Nagelberg is an Endocrinologist practicing medicine in Rancho Cucamonga, California. Dr. Nagelberg is rated as an Advanced provider by MediFind in the treatment of Hyperthyroidism. She is also highly rated in 3 other conditions, according to our data. Her clinical expertise encompasses Hyperthyroidism, Thyroid Storm, Addison's Disease, Secondary Adrenal Insufficiency, and Parathyroidectomy. Dr. Nagelberg is board certified in American Board Of Internal Medicine. Dr. Nagelberg is currently accepting new patients.

    Advanced in Hyperthyroidism
    Internal Medicine
    Advanced in Hyperthyroidism
    Internal Medicine

    Mallu C. Reddy M.D., Inc

    1196 N Park Ave, 
    Pomona, CA 
     (6.1 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Mallu Reddy is a primary care provider, practicing in Internal Medicine in Pomona, California. Dr. Reddy is rated as an Advanced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 45 other conditions, according to our data. His clinical expertise encompasses Type 2 Diabetes (T2D), Hypertension, Familial Hypertension, Endoscopy, and Gastrostomy. Dr. Reddy is board certified in American Board Of Internal Medicine. Dr. Reddy is currently accepting new patients.

    Advanced in Hyperthyroidism
    Family Medicine
    Advanced in Hyperthyroidism
    Family Medicine

    Ravinder Singh, Md, Inc.

    8231 Rochester Ave, 
    Rancho Cucamonga, CA 
     (6.5 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Ravinder Singh is a primary care provider, practicing in Family Medicine in Rancho Cucamonga, California. Dr. Singh is rated as an Advanced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 121 other conditions, according to our data. His clinical expertise encompasses Hypercalcemia, Milk-Alkali Syndrome, Type 2 Diabetes (T2D), Hormone Replacement Therapy (HRT), and Parathyroidectomy. Dr. Singh is board certified in American Board Of Family Medicine. Dr. Singh is currently accepting new patients.

    Experienced in Hyperthyroidism
    Family Medicine
    Experienced in Hyperthyroidism
    Family Medicine

    Office

    437 N Euclid Ave, 
    Ontario, CA 
     (0.3 miles away)
    Languages Spoken:
    English

    Mark Folmsbee is a primary care provider, practicing in Family Medicine in Ontario, California. Dr. Folmsbee is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 11 other conditions, according to our data. His clinical expertise encompasses High Cholesterol, Obesity in Children, Obesity, and Type 2 Diabetes (T2D).

    Experienced in Hyperthyroidism
    Family Medicine
    Experienced in Hyperthyroidism
    Family Medicine

    Cucamonga Valley Medical Group, Inc.

    1310 San Bernardino Rd, 
    Upland, CA 
     (2.7 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Muhammad Mowjood is a primary care provider, practicing in Family Medicine in Upland, California. Dr. Mowjood is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 20 other conditions, according to our data. His clinical expertise encompasses Obesity, Methylmalonic Acidemia with Homocystinuria, Hypermethioninemia, and Sulfite Oxidase Deficiency. Dr. Mowjood is board certified in American Osteopathic Board Of Family Practice.

    Experienced in Hyperthyroidism
    Family Medicine
    Experienced in Hyperthyroidism
    Family Medicine

    Unicare Community Health Center Inc.

    1151 E Walnut St, 
    Ontario, CA 
     (2.8 miles away)
    Languages Spoken:
    English

    Naila Mubashar is a primary care provider, practicing in Family Medicine in Ontario, California. Dr. Mubashar is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. She is also highly rated in 12 other conditions, according to our data. Her clinical expertise encompasses Obesity in Children, Obesity, Food Allergy, and Fish-Eye Disease.

    Experienced in Hyperthyroidism
    Family Medicine
    Experienced in Hyperthyroidism
    Family Medicine

    R S Bir MD Inc

    11692 Central Ave, 
    Chino, CA 
     (2.9 miles away)
    Experience:
    17+ years
    Languages Spoken:
    English

    Michelle Oneil is a primary care provider, practicing in Family Medicine in Chino, California. She has been practicing medicine for over 17 years. Dr. Oneil is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. Her clinical expertise encompasses Vitamin D Deficiency, High Cholesterol, Familial Combined Hyperlipidemia, and Xanthoma.

    Experienced in Hyperthyroidism
    Internal Medicine
    Experienced in Hyperthyroidism
    Internal Medicine

    Kevin Jenkins, Do, Inc.

    944 W Foothill Blvd, 
    Upland, CA 
     (3.1 miles away)
    Languages Spoken:
    English

    Kevin Jenkins is a primary care provider, practicing in Internal Medicine in Upland, California. Dr. Jenkins is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 18 other conditions, according to our data. His clinical expertise encompasses Irritable Bowel Syndrome (IBS), Diverticular Disease, Helicobacter Pylori Infection, Gastrostomy, and Colonoscopy. Dr. Jenkins is board certified in American Osteopathic Board Of Internal Medicine.

    Experienced in Hyperthyroidism
    Endocrinology
    Experienced in Hyperthyroidism
    Endocrinology
    Referral required

    Ontario Medical Center

    2295 S Vineyard Ave, 
    Ontario, CA 
     (3.2 miles away)
    Languages Spoken:
    English
    Accepting New Patients
    Offers Telehealth

    Brandon Chock is an Endocrinologist practicing medicine in Ontario, California. Dr. Chock is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 3 other conditions, according to our data. His clinical expertise encompasses Type 1 Diabetes (T1D), Empty Sella Syndrome, Thyroid Nodule, and Prolactinoma. Dr. Chock is currently accepting new patients.

    Experienced in Hyperthyroidism
    Endocrinology
    Experienced in Hyperthyroidism
    Endocrinology
    Referral required

    Kaiser Permanente Ontario Medical Center - Endocrinology Department

    2295 S Vineyard Ave, 
    Ontario, CA 
     (3.2 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Dat Ha is an Endocrinologist practicing medicine in Ontario, California. Dr. Ha is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 1 other condition, according to our data. His clinical expertise encompasses Type 1 Diabetes (T1D), Thyroid Nodule, Thyroid Storm, and Hyperthyroidism. Dr. Ha is currently accepting new patients.

    Experienced in Hyperthyroidism
    Internal Medicine
    Experienced in Hyperthyroidism
    Internal Medicine

    Chino Medical Group Inc

    5475 Walnut Ave, 
    Chino, CA 
     (3.4 miles away)
    Languages Spoken:
    English

    Jose Lira is a primary care provider, practicing in Internal Medicine in Chino, California. Dr. Lira is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 5 other conditions, according to our data. His clinical expertise encompasses High Cholesterol, Cirrhosis, Familial Combined Hyperlipidemia, and Xanthoma.

    Experienced in Hyperthyroidism
    Internal Medicine
    Experienced in Hyperthyroidism
    Internal Medicine

    Chino Medical Group Inc

    5475 Walnut Ave, 
    Chino, CA 
     (3.4 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Avani Patel-Shah is a primary care provider, practicing in Internal Medicine in Chino, California. Dr. Patel-Shah is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. She is also highly rated in 3 other conditions, according to our data. Her clinical expertise encompasses Type 2 Diabetes (T2D), High Cholesterol, Cirrhosis, and Osteomyelitis in Children.

    Experienced in Hyperthyroidism
    Family Medicine
    Experienced in Hyperthyroidism
    Family Medicine

    Chino Medical Group Inc

    5475 Walnut Ave, 
    Chino, CA 
     (3.4 miles away)
    Languages Spoken:
    English, Spanish
    Accepting New Patients

    Nayan Shah is a primary care provider, practicing in Family Medicine in Chino, California. Dr. Shah is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 12 other conditions, according to our data. His clinical expertise encompasses High Cholesterol, Obesity, Familial Combined Hyperlipidemia, and Xanthoma. Dr. Shah is currently accepting new patients.

    Experienced in Hyperthyroidism
    Internal Medicine
    Experienced in Hyperthyroidism
    Internal Medicine

    Parktree Community Health Center

    1450 E Holt Ave, 
    Pomona, CA 
     (4.2 miles away)
    Languages Spoken:
    English

    Ranjit Shenoy is a primary care provider, practicing in Internal Medicine in Pomona, California. Dr. Shenoy is rated as an Experienced provider by MediFind in the treatment of Hyperthyroidism. He is also highly rated in 4 other conditions, according to our data. His clinical expertise encompasses Obesity in Children, Food Allergy, Obesity, and Type 2 Diabetes (T2D).

    Showing 1-20 of 84

    Last Updated: 09/26/2026

    What is the definition of Hyperthyroidism?

    Hyperthyroidism is a condition in which the thyroid gland makes too much thyroid hormone. The condition is often called overactive thyroid.

    When should I see a Hyperthyroidism doctor near 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 Hyperthyroidism doctor near 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 Hyperthyroidism doctors near 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 Hyperthyroidism doctors near 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 Hyperthyroidism doctor near 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 Hyperthyroidism doctor search results page. 

    Why is it important to get a second opinion from a different Hyperthyroidism 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 Hyperthyroidism doctor near 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 Hyperthyroidism 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 Hyperthyroidism 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 Hyperthyroidism doctors near ontario, CA?

    Look for the filter feature on the left side of the Hyperthyroidism 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 Hyperthyroidism doctor that offers video calls?

    Look for the filter feature on the left-side of the Hyperthyroidism 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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