New Patients

Patient Forms, Map and Directions to San Mateo Office

Planning your first visit to Peninsula Gastrointestinal Specialists? On this page, you'll find the information you need to get started, such as a map and directions to our San Mateo office. To save you time, we've also included our new patient forms, which you can print out and complete prior to visiting our office.

Mission Statement

Our practice has been delivering health care to patients since 1985. Our goal is to provide you with personalized medical care using the most current technology to diagnose and treat your medical problems. Our professional office staff strives to make your experience with us as comfortable and fulfilling as possible.

Patient Forms

For your convenience, our patient forms are located below. Please download, print and complete the following forms so we can expedite your first visit. Please also bring your insurance cards and any other pertinent information to your visit.

Patient Forms (PDF)

Patient Forms (Online)

Please click here to securely send us a copy of your Insurance Cards (front and back) and/or Records.

Dr. Onuma's Preps

Dr. Lee's Preps

Schedule your Video Visit with Dr. Lee here

Other Preps

Get Adobe Reader

In order to view or print these forms you will need Adobe Acrobat Reader installed.
Click here to download it.

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.  You may contact our billing service by phone at 650-501-9776 or by email at [email protected].

Please visit FAQs for answers to common questions about insurance

Payment Options

For your convenience, we accept check, cash, or credit card. Please contact our Financial Coordinator for details.

You may pay your balance online by using our PCI-secure link below. Please fill in all requested information in order for us to credit the correct account.

Secure Merchant Account Credit Card Processing.Merchant Account

What To Expect

Being well-prepared for your appointment will ensure that the doctor has all of the needed information to provide the best possible care for you. It will also help alleviate any unnecessary anxiety you may be feeling prior to your first appointment. Educate yourself on your symptoms by reviewing the content on this website. Also, take some time to review our staff page and familiarize yourself with the doctors. We look forward to your first visit.

Driving Directions

Our Location

Find us on the map

Office Hours

Our Regular Schedule


9:00 am-12:00 pm

2:00 pm-5:00 pm


9:00 am-12:00 pm

2:00 pm-5:00 pm


9:00 am-12:00 pm

2:00 pm-5:00 pm


9:00 am-12:00 pm

2:00 pm-5:00 pm


9:00 am-12:00 pm

2:00 pm-5:00 pm