Peninsula Gastrointestinal Specialists

San Mateo

Gastroenterology · 1 Provider

Average Rating of all Office Providers

Office Providers

Office Provider Reviews


based on the average of 5 provider reviews for Peninsula Gastrointestinal Specialists

Review of Dr. Onuma

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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%.
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Review of 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!
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Learn About Peninsula Gastrointestinal Specialists

4 Procedures

  • Colonoscopy, Proctosigmoidoscopy, And Sigmoidoscopy
  • Endoscopy (Esophagus, Stomach, Small Intestine)
  • Gastroenterology Procedures
  • Liver Biopsy

Language Services

  • Japanese

Peninsula Gastrointestinal Specialists accepts 7 insurance carriers

  • 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.