Peninsula Gastroenterology Medical Group

Redwood City

Gastroenterology · 5 Providers

Average Rating of all Office Providers

Office Providers

Office Provider Reviews


based on the average of 26 provider reviews for Peninsula Gastroenterology Medical Group

Review of Dr. Rengstorff

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Dr. Rengstorff is always on time for his appts, and both he and his staff are most pleasant and competent. I greatly value Dr. Rengstorff's medical expertise as well as his willingness to answer questions and discuss patients' concerns. I also appreciate that he responds in a timely manner to messages sent to him and shares test results as they become available. I am fortunate to have Dr. Rengstorff as part of my health care team!
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Review of Dr. Yang


Dr. Yang has been my GI Dr. for years. She is outstanding! Colonoscopies, endoscopies, ulcers, etc. she has diagnosed my issues perfectly and treated them competently. She has a wonderful bedside manner yet you know she is supremely competent.
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Review of Dr. Rengstorff


A previous GI doc prescribed a PPI, and I was not tolerating it well. My reflux was gone but I had suddenly become severely anemic, was falling down a lot, and was regurgitating daily. I saw Dr, Rengstorff for a desperate 4th opinion. He was not interested in my symptoms, just reiterated to stay on the med. When I asked for some alternative he "fired" me as a patient. I have never felt so alone or uncared for. I am happy to say I am now off that med & have no more reflux. I cannot recommend.
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Review of Dr. Yang

- in san jose, ca |

My wife had an intestinal problem. Dr Yang performed a colonoscopy on her this week. I drove my wife to the Atherton Endoscopy Center where Dr Yang performed the colonoscopy. The front desk was so friendly. The nurses were quite sweet. After about one hour, the nurse escorted my wife to me (in the waiting room). My wife told me the entire procedure was extremely smooth. Dr Yang found 2 polyps and removed both -no pain, no discomfort.. She was amazed with how superb Dr Yang was.
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Review of Dr. Yang

- in San Bruno, CA |

Dr. Yang is an excellent physician that I feel is watching out for my well being.
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Learn About Peninsula Gastroenterology Medical Group

22 Procedures

  • Ablation
  • Anoscopy
  • Bile Duct Procedure
  • Breath Testing
  • Capsule Endoscopy
  • Colon Cancer Screening
  • Colonoscopy
  • Colonoscopy With Polypectomy
  • Colonoscopy, Proctosigmoidoscopy, And Sigmoidoscopy
  • Colorectal Cancer Screening
  • Endoscopic Polypectomy
  • Endoscopy
  • Endoscopy (Esophagus, Stomach, Small Intestine)
  • Ercp (Endoscopic Retrograde Cholangiopancreatography)
  • Esophageal Surgery
  • Flexible Sigmoidoscopy
  • Gastroenterology Procedures
  • Hemorrhoid Treatment
  • Hemorrhoidectomy Or Excision Of Anal Tags
  • Manometry
  • Physical Examination
  • Sigmoidoscopy


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Language Services

  • French
  • Greek
  • Mandarin
  • Spanish
  • Taiwanese

Peninsula Gastroenterology Medical Group accepts 21 insurance carriers

  • Aetna
  • Anthem Blue Cross Blue Shield
  • AvMed
  • Beech Street (Multiplan)
  • Benesys
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of California
  • Blue Shield of California
  • Cigna
  • Commercial Insurance Company
  • Coventry Health Care
  • First Health (Coventry Health Care)
  • Government Employees Health Association (GEHA)
  • Guardian
  • Health Net
  • HealthSmart - Interplan Health Group
  • Humana
  • Kaiser Permanente
  • MultiPlan
  • Principal Life
  • UnitedHealthCare


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