The 20 Best Diarrhea Doctors Near Me in Ontario, CA

Find the Top Diarrhea Experts and Specialists

Last Updated: 04/28/2026

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MediFind found 196 doctor with experience in Diarrhea near Ontario, CA. Of these, 180 are Experienced, 14 are Advanced and 2 are Distinguished.

Location
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196 providers found
    Distinguished in Diarrhea
    Gastroenterology
    Distinguished in Diarrhea
    Gastroenterology

    Ct Hung MD Inc.

    629 N 13th Ave, 
    Upland, CA 
     (2.7 miles away)
    Languages Spoken:
    English

    Chuang-ti Hung is a Gastroenterologist practicing medicine in Upland, California. Dr. Hung is rated as a Distinguished provider by MediFind in the treatment of Diarrhea. He is also highly rated in 47 other conditions, according to our data. His clinical expertise encompasses Diverticular Disease, Trichohepatoenteric Syndrome, Hemorrhoids, Gastrectomy, and Gastrostomy.

    Distinguished in Diarrhea
    Gastroenterology
    Distinguished in Diarrhea
    Gastroenterology

    Basim Z. Abdelkarim, M.D., Inc.

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

    Basim Abdelkarim is a Gastroenterologist practicing medicine in Upland, California. He has been practicing medicine for over 27 years. Dr. Abdelkarim is rated as a Distinguished provider by MediFind in the treatment of Diarrhea. He is also highly rated in 67 other conditions, according to our data. His clinical expertise encompasses Diverticular Disease, Hemorrhoids, Gastroesophageal Reflux Disease (GERD), Gastrostomy, and Endoscopy. Dr. Abdelkarim is board certified in American Board Of Internal Medicine.

    Experienced in Diarrhea
    Family Medicine
    Experienced in Diarrhea
    Family Medicine

    Chino Hills Family Medical Group

    15361 Central Avenue, 
    Chino, CA 
     (4.6 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Cynthia Moreno is a primary care provider, practicing in Family Medicine in Chino, California. Dr. Moreno is rated as an Experienced provider by MediFind in the treatment of Diarrhea. She is also highly rated in 10 other conditions, according to our data. Her clinical expertise encompasses Empyema, Sinusitis, Cellulitis, and Vertigo.

    Learn about our expert tiers
    Advanced in Diarrhea
    Gastroenterology
    Advanced in Diarrhea
    Gastroenterology

    Basim Z. Abdelkarim, M.D., Inc.

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

    Priyanka Yaramada is a Gastroenterologist practicing medicine in Upland, California. She has been practicing medicine for over 18 years. Dr. Yaramada is rated as an Advanced provider by MediFind in the treatment of Diarrhea. She is also highly rated in 27 other conditions, according to our data. Her clinical expertise encompasses Anemia, Diverticular Disease, Hemorrhoids, Gastrectomy, and Gastrostomy. Dr. Yaramada is board certified in American Board Of Internal Medicine.

    Advanced in Diarrhea
    Family Medicine
    Advanced in Diarrhea
    Family Medicine

    Office

    1601 Monte Vista Ave Ste 190, 
    Claremont, CA 
     (4.4 miles away)
    Languages Spoken:
    English

    Monique Castro is a primary care provider, practicing in Family Medicine in Claremont, California. Dr. Castro is rated as an Advanced provider by MediFind in the treatment of Diarrhea. She is also highly rated in 35 other conditions, according to our data. Her clinical expertise encompasses Acute Cystitis, Otitis, Asthma in Children, and Eosinophilic Asthma.

    Advanced in Diarrhea
    Family Medicine
    Advanced in Diarrhea
    Family Medicine

    Office

    1601 Monte Vista Ave Ste 190, 
    Claremont, CA 
     (4.4 miles away)
    Languages Spoken:
    English

    Dana Homer is a primary care provider, practicing in Family Medicine in Claremont, California. Dr. Homer is rated as an Advanced provider by MediFind in the treatment of Diarrhea. She is also highly rated in 39 other conditions, according to our data. Her clinical expertise encompasses Cellulitis, Parinaud Oculoglandular Syndrome, Otitis, and Peptic Ulcer.

    Advanced in Diarrhea
    Gastroenterology
    Advanced in Diarrhea
    Gastroenterology

    Carlos R. Vigil DO A Professional Corp.

    7974 Haven Ave Ste 210, 
    Rancho Cucamonga, CA 
     (4.7 miles away)
    Languages Spoken:
    English

    Hussein Abidali is a Gastroenterologist practicing medicine in Rancho Cucamonga, California. Dr. Abidali is rated as an Advanced provider by MediFind in the treatment of Diarrhea. He is also highly rated in 44 other conditions, according to our data. His clinical expertise encompasses Gastrointestinal Bleeding, Hiatal Hernia, Congenital Diaphragmatic Hernia, Endoscopy, and Gastrostomy.

    Experienced in Diarrhea
    Gastroenterology
    Experienced in Diarrhea
    Gastroenterology

    Andrea S Tieng MD, Inc

    10801 Foothill Blvd, Ste 106, 
    Rancho Cucamonga, CA 
     (5.3 miles away)
    Languages Spoken:
    English
    Accepting New Patients

    Dr. Andrea Tieng was born and raised in New York City. She graduated Summa Cum Laude from the City University of New York and completed her medical degree at the State University of New York Health Science Center at the SUNY Downstate College of Medicine in Brooklyn, New York.Her internship and residency in Internal Medicine was completed at the Albert Einstein College of Medicine at Long Island Jewish Medical Center in New Hyde Park, New York, where she also fulfilled her Gastroenterology and Hepatology Fellowship.Board Certified by the American Board of Internal Medicine, Dr. Tieng is licensed to practice in both California and New York. She is a member of the American College of Gastroenterology and the American Gastroenterology Association.Prior to founding her own practice in Redlands and San Bernardino, Dr. Tieng worked as a private gastroenterologist at Cedars-Sinai Medical Center in Los Angeles.Dr. Tieng specializes in providing sensitive and compassionate care to women, and delivers personalized care to all patients 18 years and older. Dr. Tieng is a board certified physician who treats patients with gastrointestinal illnesses and liver diseases. She utilizes innovative technology to perform diagnostic and therapeutic procedures of the gastrointestinal tract, including colonoscopy and upper endoscopy. Dr. Tieng is rated as an Experienced provider by MediFind in the treatment of Diarrhea. She is also highly rated in 4 other conditions, according to our data. Her clinical expertise encompasses Diverticular Disease, Familial Adenomatous Polyposis, Gastritis, Gastrectomy, and Endoscopy. Dr. Tieng is board certified in Internal Medicine. Dr. Tieng is currently accepting new patients.

    Experienced in Diarrhea
    General Practice
    Experienced in Diarrhea
    General Practice

    California Medical Clinic Inc.

    402 E Holt Blvd, 
    Ontario, CA 
     (0.1 miles away)
    Languages Spoken:
    English

    David Lozano is a primary care provider, practicing in General Practice in Ontario, California. Dr. Lozano is rated as an Experienced provider by MediFind in the treatment of Diarrhea. He is also highly rated in 14 other conditions, according to our data. His clinical expertise encompasses Osteomyelitis in Children, Type 2 Diabetes (T2D), High Cholesterol, and Cirrhosis.

    Experienced in Diarrhea
    Experienced in Diarrhea

    Kong-Tay Wu M.D Inc

    437 N Campus Ave, 
    Ontario, CA 
     (0.4 miles away)
    Languages Spoken:
    English

    Catareya Liep is a Pediatrics provider practicing medicine in Ontario, California. Dr. Liep is rated as an Experienced provider by MediFind in the treatment of Diarrhea. Her clinical expertise encompasses Diarrhea.

    Experienced in Diarrhea
    Family Medicine
    Experienced in Diarrhea
    Family Medicine

    Ravinder Singh, Md, Inc.

    525 N 13th Ave, 
    Upland, CA 
     (2.6 miles away)
    Experience:
    27+ years
    Languages Spoken:
    English
    Offers Telehealth

    Ravinder Singh is a primary care provider, practicing in Family Medicine in Upland, California. He has been practicing medicine for over 27 years. Dr. Singh is rated as an Experienced provider by MediFind in the treatment of Diarrhea. He is also highly rated in 108 other conditions, according to our data. His clinical expertise encompasses Glucocorticoid-Remediable Aldosteronism, Familial Hypertension, Hypertension, Liver Transplant, and Knee Replacement. Dr. Singh is board certified in American Board Of Family Medicine.

    Experienced in Diarrhea
    Experienced in Diarrhea

    Perez And Perez Medical Corp

    630 N 13th Ave, 
    Upland, CA 
     (2.7 miles away)
    Experience:
    48+ years
    Languages Spoken:
    English

    Glenn Perez is a Pediatrics provider practicing medicine in Upland, California. He has been practicing medicine for over 48 years. Dr. Perez is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His clinical expertise encompasses Obesity in Children, Diarrhea, and Croup. Dr. Perez is board certified in American Board Of Pediatrics.

    Experienced in Diarrhea
    Family Medicine
    Experienced in Diarrhea
    Family Medicine

    Cucamonga Valley Medical Group, Inc.

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

    Muhammad Mowjood is a primary care provider, practicing in Family Medicine in Upland, California. He has been practicing medicine for over 26 years. Dr. Mowjood is rated as an Experienced provider by MediFind in the treatment of Diarrhea. 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 Diarrhea
    Family Medicine
    Experienced in Diarrhea
    Family Medicine

    Win Family Medicine Inc.

    811 E 11th St Ste 205, 
    Upland, CA 
     (2.8 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Sandar Win is a primary care provider, practicing in Family Medicine in Upland, California. Dr. Win is rated as an Experienced provider by MediFind in the treatment of Diarrhea. Her clinical expertise encompasses Hypertension, Familial Hypertension, Glucocorticoid-Remediable Aldosteronism, and Osteomyelitis in Children.

    Experienced in Diarrhea
    Internal Medicine
    Experienced in Diarrhea
    Internal Medicine

    Cucamonga Valley Medical Group, Inc.

    5562 Philadelphia St, 
    Chino, CA 
     (2.9 miles away)
    Experience:
    15+ years
    Languages Spoken:
    English
    Offers Telehealth

    Brandon Tong is a primary care provider, practicing in Internal Medicine in Chino, California. He has been practicing medicine for over 15 years. Dr. Tong is rated as an Experienced provider by MediFind in the treatment of Diarrhea. He is also highly rated in 20 other conditions, according to our data. His clinical expertise encompasses Obesity, Familial Hypobetalipoproteinemia, Chorea-Acanthocytosis, Familial HDL Deficiency, and Ureteroscopy. Dr. Tong is board certified in American Osteopathic Board Of Internal Medicine.

    Experienced in Diarrhea
    Internal Medicine
    Experienced in Diarrhea
    Internal Medicine

    Inland Pulmonary Medical Group

    9525 Monte Vista Ave Unit 105, 
    Montclair, CA 
     (2.9 miles away)
    Languages Spoken:
    English

    Jose Santiago is a primary care provider, practicing in Internal Medicine in Montclair, California. Dr. Santiago is rated as an Experienced provider by MediFind in the treatment of Diarrhea. He is also highly rated in 22 other conditions, according to our data. His clinical expertise encompasses Apoplexy, Sepsis, Gastrointestinal Bleeding, Hernia Surgery, and Kidney Transplant.

    Experienced in Diarrhea
    Internal Medicine
    Experienced in Diarrhea
    Internal Medicine

    Premiere Medical Group Of California

    901 San Bernardino Rd Ste 101, 
    Upland, CA 
     (2.9 miles away)
    Languages Spoken:
    English

    Ythanh Nguyen is a primary care provider, practicing in Internal Medicine in Upland, California. Dr. Nguyen is rated as an Experienced provider by MediFind in the treatment of Diarrhea. She is also highly rated in 26 other conditions, according to our data. Her clinical expertise encompasses Peptic Ulcer, Sepsis, Necrosis, Endoscopy, and Colonoscopy.

    Experienced in Diarrhea
    Gastroenterology
    Experienced in Diarrhea
    Gastroenterology

    Chaparral Medical Group Inc.

    1330 San Bernardino Rd Ste L, 
    Upland, CA 
     (2.9 miles away)
    Languages Spoken:
    English

    Nischita Merla is a Gastroenterologist practicing medicine in Upland, California. Dr. Merla is rated as an Experienced provider by MediFind in the treatment of Diarrhea. She is also highly rated in 36 other conditions, according to our data. Her clinical expertise encompasses Attenuated Familial Adenomatous Polyposis, Cronkhite-Canada Disease, Juvenile Polyposis Syndrome, Endoscopy, and Gastrostomy.

    Experienced in Diarrhea
    Gastroenterology
    Experienced in Diarrhea
    Gastroenterology

    Dwaraknath P. Reddy M.D.

    811 E 11th St Ste 208, 
    Upland, CA 
     (2.9 miles away)
    Languages Spoken:
    English

    Dwaraknath Reddy is a Gastroenterologist practicing medicine in Upland, California. Dr. Reddy is rated as an Experienced provider by MediFind in the treatment of Diarrhea. He is also highly rated in 1 other condition, according to our data. His clinical expertise encompasses Esophagitis, Gastrointestinal Bleeding, Painful Swallowing, Gastrectomy, and Gastrostomy.

    Experienced in Diarrhea
    Family Medicine
    Experienced in Diarrhea
    Family Medicine

    Inland Family Healthcare Centers Inc.

    300 N Euclid Ave Ste B, 
    Upland, CA 
     (2.9 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Rick Hirsch is a primary care provider, practicing in Family Medicine in Upland, California. Dr. Hirsch is rated as an Experienced provider by MediFind in the treatment of Diarrhea. He is also highly rated in 1 other condition, according to our data. His clinical expertise encompasses Multiple Myeloma, Glucocorticoid-Remediable Aldosteronism, Hypertension, Bone Marrow Aspiration, and Gastrostomy.

    Showing 1-20 of 196

    Last Updated: 04/28/2026

    What is the definition of Diarrhea?

    Diarrhea is when you pass loose or watery stool.

    When should I see a Diarrhea 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 Diarrhea 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 Diarrhea 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 Diarrhea 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 Diarrhea 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 Diarrhea doctor search results page. 

    Why is it important to get a second opinion from a different Diarrhea 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 Diarrhea 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 Diarrhea 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 Diarrhea 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 Diarrhea doctors near Ontario, CA?

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

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