Peninsula Gastrointestinal Specialists

Gastroenterology • San Simeon, CA

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About

Peninsula Gastrointestinal Specialists, Inc. is a San Mateo-based gastroenterology medical practice offering digestive health services (e.g., stomach pain, acid reflux, constipation). Contact: contactus@mygidoctors.net, phone (650) 342-7432. Website: mygidoctors.com.

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Clinic Type

Gastroenterology

Address

San Mateo, CA

Phone

(650) 342-7432

Email

contactus@mygidoctors.net

Opening Hours

Office hours not specified on page

Website

https://www.mygidoctors.com/

Services Offered

Gastroenterology
Endoscopy
Colonoscopy
Treatments for reflux
Stomach pain
Ulcers
Digestive health
Patient education

Technology & Equipment

Endoscopy
Colonoscopy
Endoscopic procedures

Team

Dr. Edward Onuma, MD, PhD in physiology (SUNY Health Science Center at Syracuse); trained at Cornell University; Ph.D. in physiology — Gastroenterologist
Dr. Eugene Lee, MD from NYU School of Medicine; Internal Medicine residency at University of Rochester/Strong Memorial Hospital — Gastroenterologist

Insurance & Payment

—

New Patients, Payment

Languages Spoken

English

Current Offers

New patient information

FAQs

What is Peninsula GI Specialists?

Gastroenterologists in San Mateo, CA, focused on digestive problems with patient-centered care.

What services are offered?

Gastroenterology services including endoscopic procedures and patient education.

FAQ question not provided in the text

Not available

Social Media

Twitter Youtube Facebook

Photos

What Patients Say

Overall sentiment across review platforms: mixed

Birdeye: 3.4/5 stars (14 reviews)
Birdeye: 4.8/5 stars (30 reviews (at time of source access))
Yelp: 1.5/5 stars (2 reviews)
WebMD Care: 4/5 stars (Dr. Onuma) (5 reviews)
WebMD Care: 5/5 stars (Dr. Lee) (1 review (Dr. Lee))

Patients praise

Professional and experienced physicians
Kind, patient, and supportive staff members
Thorough exams and clear explanations of conditions
Clean and efficient office environment

Common complaints

Billing and insurance processing concerns
Appointment scheduling issues
Negative feedback regarding physician bedside manner in isolated instances

"Dr. Onuma and Nancy are professional, kind, patient, supportive, and caring. My office visits are always such a wonderful experience. They are welcoming, there is no wait time, appointments start promptly, and scheduling is trouble free. Dr. Onuma and Nancy provide outstanding and world-class service."

— WebMD Care Patient Review

"Doctor Onuma seems to do a good job; the problem is the billing department. I just received a bill for nearly $300 for a procedure performed ten months ago."

— Yelp Review

Synthesized from public review platforms as of Jul 10, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 10, 2026. Own this clinic? Claim or correct this listing.