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Dr. Edward Onuma, MD

Dr. Edward Onuma, MD

Gastroenterology*
30+ years of experience

Dr. Edward Onuma, MD is a gastroenterologist in San Mateo, CA and has over 30 years of experience in the medical field. Dr. Onuma has extensive experience in Pancreatic Disease and Esophageal Disorders. He graduated from STATE UNIVERSITY OF NEW YORK / HEALTH SCIENCE CENTER AT SYRACUSE in 1990. He is affiliated with Mills-Peninsula Medical Center. He is accepting new patients and telehealth appointments.

3.9 Star Rating
Based on 7 reviews 3.9 Star Rating (7 reviews)

Practice

100 S Ellsworth Ave Ste 507 San Mateo, CA 94401
Telehealth available

Make an Appointment

Hospital Highlight

Dr. Onuma is affiliated with Mills-Peninsula Medical Center Burlingame, a highly rated and top awarded hospital for gastroenterology.

At a Glance

  • Area of Expertise
    Dr. Onuma specializes in the area of Gastroenterology. See board certifications
  • Explains Conditions Well
    Patients said this doctor explains conditions well. See reviews
  • Offers Telehealth
    This doctor offers telehealth appointments. Call the office to schedule an appointment.
  • Practices at Top Hospital
    Gastrointestinal Care Excellence Award™ See hospitals
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Dr. Onuma's Reviews

Likelihood to recommend Dr. Onuma

3.9
7 ratings, 4 with a written review
5 star
71%
71%
4 star
0%
0%
3 star
0%
0%
2 star
0%
0%
1 star
29%
29%

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Dr Onuma’s provides exceptional care and follow up.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Mar 28, 2025
×Post a ResponseAre you Dr. Onuma?
Incredibly inefficient front desk staff. Save yourself the headache and look for another GI doctor if you want to avoid scheduling, billing, getting lab results, etc. issues.
What went well
No results
What could be improved
  • Staff wasn't friendly
1 other person found this helpful
Helpful
Jul 13, 2021
×Post a ResponseAre you Dr. Onuma?
Dr Onuma is my second opinion dr He is very kind and concerned about all your health conditions.He knows how to explain, listen and speaks to his patient. To me having others medical conditions and being treated for different specialists . The main key for a good dr is having all good !!! Mentioned above !!! That I was missing from my previous Gastrentologist . Excellent and I will recommend him 100%.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
1 other person found this helpful
Helpful
Sonia – Mar 16, 2018
×Post a ResponseAre you Dr. Onuma?
Dr. Onuma is a fantastic doctor! He takes the time to listen to you and your concerns. He also takes the time to get to know you. He is great at returning calls if you have a concern or need anything. I am so grateful that I found him!
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
9 others found this helpful
Helpful
Jul 03, 2017
×Post a ResponseAre you Dr. Onuma?

Leave a review

How was your experience with Dr. Onuma?

About Me

biography

Dr. Edward Onuma, MD is a gastroenterologist in San Mateo, CA and has over 30 years of experience in the medical field. Dr. Onuma has extensive experience in Pancreatic Disease and Esophageal Disorders. He graduated from STATE UNIVERSITY OF NEW...read more
  • Gastroenterology

*Healthgrades does not verify qualifications for medical specialties. Please verify your provider's specialty and qualifications directly with your provider and applicable medical board.

  • State University Of New York / Health Science Center At Syracuse

    Medical School, 1990
American Board of Medical Specialties®
American Board of Internal Medicine®
Gastroenterology
For detailed information about any of the below board actions, please search for the provider's records on the linked state licensing board or the Federation of State Medical Boards. To learn more about the difference between these sources, please refer to our FAQs.
Healthgrades has not received any data indicating a board action exists for this provider.
  • English

  • Japanese

Locations

Practice

Peninsula Gastrointestinal100 S Ellsworth Ave Ste 507 San Mateo, CA 94401
1

Affiliated Hospitals

  • Mills-Peninsula Medical Center

    1501 Trousdale Dr
    Burlingame, CA 94010
    Recipient of 46
    hospital awards

    America's 100 Best Hospitals Award™ (2025, 2024, 2023)

    Top 1% in the nation for providing the highest clinical quality year over year

    America's 250 Best Hospitals Award™ (2025, 2024, 2023)

    Top 1% in the nation for providing the highest clinical quality year over year

    View all awards

    How patients felt about the care they received at this hospital.

    87%
    Patients said they were given information about recovering at home

    3% higher than the national average

    80%
    Patients would recommend the hospital to friends and family

    15% higher than the national average

    View all patient feedback
Learn more about how Healthgrades measures Hospital Quality