Dr. Edward Onuma, MD

Dr. Edward Onuma, MD

Gastroenterology  ·  
Male  ·  
Age 59
Dr. Edward Onuma, MD is a gastroenterology specialist in San Mateo, CA and has been practicing for 20 years. He graduated from SUNY Upstate Medical University in 1990 and specializes in gastroenterology and internal medicine.

100 S Ellsworth Ave Ste 507

San Mateo, CA 94401

Contact Information

Insurance Accepted

  • Aetna
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of California
  • Blue Shield of California
  • Chinese Community Health Plan (CCHP)
  • MultiPlan
  • Western Health Advantage

*Please verify this information when scheduling an appointment.

Learn about Dr. Onuma

Be confident in your decisions by checking out your provider's top areas of care, education, patient reviews and more. Learn about finding the right doctor for you.

Top Care Areas

See how frequently Dr. Onuma performs your care needs compared to other doctors.

very high
more than 99% of peers
very high
more than 99% of peers
Abdominal Pain
very high
more than 99% of peers

Dr. Onuma's percentages are based on the rate of treatment compared to peers nationwide from insurance data. Learn more info about our data and this Top Care Areas component.

2  Specialties

  • Gastroenterology
  • Internal Medicine

2  Board Certifications

  • Gastroenterology
    Accredited by: American Board of Medical Specialties*
  • Internal Medicine
    Accredited by: American Board of Internal Medicine*

76  Conditions Treated

Read Less

4  Procedures

Background Check

0 Malpractice Claims

No malpractice history found for California.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • SUNY Upstate Medical University
    Medical School | Graduated 1990
  • St. Vincent S Hospital
    Internship Hospital | Completed 1991
  • Robert Wood Johnson Med School
    Residency Hospital | Completed 1995
  • Robert Wood Johnson Med School
    Fellowship Hospital | Completed 1998

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Onuma has no media or publications listed.

Languages Spoken

  • English
  • Japanese

Memberships & Professional Affiliations

Dr. Onuma does not have any memberships or affiliations listed. If you are Dr. Onuma and would like to add memberships or affiliations, please update your profile.

Dr. Onuma's Reviews

Likelihood of recommending Dr. Onuma to family and friends
5 total reviews (2 have comments)

Likelihood to Recommend (5)

  • 5
  • 4
  • 3
  • 2
  • 1

Dr. Onuma's Performance

  • Trustworthiness

  • Explains condition(s) well

  • Answers questions

  • Time well spent


Office & Staff Performance

  • Scheduling

  • Office environment

  • Staff friendliness

  • Average wait time

    16 to 30 minutes

Patient Comments (2)

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 !!!...more
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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!
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