(650) 342-7432

100 S. Ellsworth Ave.
Suite 507
San Mateo, CA 94401
(650) 342-7432

San Mateo Gastroenterologist- San Mateo Gastroenterologist Office

Comfort and convenience are the hallmarks of Peninsula Gastrointestinal Specialists' office operations. To ensure your convenience, below is the information you need about our hours, location, appointment scheduling, insurance acceptance and billing.

Please visit FAQs for answers to common questions

Peninsula Gastrointestinal Specialists
100 S. Ellsworth Ave., Suite 507
San Mateo, CA 94401
(650) 342-7432 Tel.

(650) 342-3239 Fax.

Office Hours


9:00 AM - 12:00 PM & 2:00 PM - 5:00PM
9:00 AM - 12:00 PM & 2:00 PM - 5:00PM
9:00 AM - 12:00 PM & 2:00 PM - 5:00PM
9:00 AM - 12:00 PM & 2:00 PM - 5:00PM
9:00 AM - 12:00 PM & 2:00 PM - 5:00PM

After Hours & Weekends
If you are calling after hours, you may leave a message and we will get back to you the next business day.  If it is regarding an urgent matter, there is an advice nurse or doctor “on-call” at all times to care for you.  You may ask to speak directly with the doctor by calling our office number (650-342-7432).  If you need to see a doctor and the office is closed, please call the Extended Hours Clinic at 650-696-9776.  Call 911 for emergencies.

Our office is conveniently located in downtown San Mateo.  We are two blocks south of the San Mateo Caltrain station.

Underground parking is available in our Mills Square Tower Building ($1.00/hour - sorry we do not validate) or street parking.

Click here for door to door driving directions

Mid-Peninsula Endoscopy Center
1720 El Camino Real, Suite 100
Burlingame, CA 94010
tel. (650) 373-1970


  • new state-of-the art facility solely dedicated to GI endoscopy
  • fully licensed and Medicare-certified location
  • recognized as 2009-2010 ASGE Endoscopy Center honoree




Mills-Peninsula Medical Center, GI Endoscopy Unit
1501 Trousdale Drive
Burlingame, CA 94010
tel. 650-696-5523
www.mills-peninsula .org



We know you have many choices when choosing a Gastroenterologist in San Mateo, CA so we have made requesting an appointment a simple and convenient process via our Web site. If, for any reason you cannot keep a scheduled appointment, or will be delayed, please call us as soon as possible.

Insurance and Billing

Please contact our office to verify acceptance of your insurance plan. Qualifications for insurance coverage may differ due to the uniqueness of each procedure. We are happy to file insurance for your reimbursement as long as you are free to choose your own gastroenterologist.

Please visit FAQs for answers to common questions about insurance

Payment Options

Please see our Financial Coordinator for details.

Questions or Comments?
We encourage you to contact us whenever you have an interest about our services.

Click here to see maps and directions.

100 S. Ellsworth Ave
Suite 507
San Mateo CA, 94401