(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.

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

(650) 342-3239 Fax

Office Hours


08:00 AM - 05:00 PM 
08:00 AM - 05:00 PM
10:00 AM - 06:00 PM 
08:00 AM - 05:00 PM 

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.

Available at Mills Square Tower Building ($1.00 for 1st hour and $0.75/hour after that- sorry we do not validate) or street parking.

Click here for door to door driving directions

Mid-Peninsula Endoscopy Center
Mills Peninsula Medical Arts Pavilion
50 S. San Mateo Drive
San Mateo, CA 94401
tel. (650) 373-1970

  • conveniently located less than a block away from our office
  • fully licensed and Medicare-certified location
  • recognized as 2009-2010 ASGE Endoscopy Center honoree




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.

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