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Peninsula Gastrointestinal Specialists: Gastroenterologist San ...

Gastroenterology • San Mateo, CA

About

Peninsula Gastrointestinal Specialists, Inc. is a San Mateo-based private medical practice offering gastroenterology services to treat digestive conditions such as stomach pain, acid reflux, and constipation. The group operates four offices in the U.S. (headquartered at 100 S. Ellsworth Ave, San Mateo, CA 94401) and has an annual revenue of about $4.24 million. Current workforce is small (2 employees noted). Website: mygidoctors.com. Notable metrics: monthly site visits ~4,122, low bounce rate (0.3%), and top country is the United States. Contact: contactus@mygidoctors.net; phone: (650) 342-7432.

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Clinic Type

Gastroenterology

Address

Peninsula Gastrointestinal Specialists, San Mateo, CA

Phone

(650) 342-7432

Email

contactus@mygidoctors.net

Opening Hours

9:00 am-12:00 pm; 2:00 pm-5:00 pm (regular schedule appears multiple days in site content)

Website

https://www.mygidoctors.com/

Services Offered

Gastroenterology
Endoscopy
Colonoscopy
Digestive Health Care
Stomach Pain Evaluation
Ulcers Evaluation
Reflux Management
Pediatric/Adult Gastroenterology (adult-focused)

Team

Dr. Edward Onuma, Board-certified gastroenterologist — Gastroenterologist
Dr. Eugene Lee, MD, specialty in Gastroenterology — Gastroenterologist

Insurance & Payment

—

Languages Spoken

English

Current Offers

New patient information

FAQs

What services are offered?

Gastroenterology, endoscopy, colonoscopy, digestive health care.

FAQ's

No explicit FAQ questions and answers provided in the extracted content.

Social Media

Twitter Youtube Facebook

Photos

What Patients Say

Overall sentiment across review platforms: mixed

Birdeye (Aggregate): 3.4 stars (14 reviews)
Birdeye (Aggregate): 4.8 stars (30 reviews)
Yelp: 1.5 stars (2 reviews)
WebMD (Dr. Eugene Lee): 5.0 stars (1 rating)

Patients praise

Professionalism, kindness, and patience of doctors, particularly Dr. Onuma and Dr. Lee
Thoroughness and expertise in gastroenterology procedures
Clean office environment and professional staff interactions (in positive reports)

Common complaints

Issues with the billing department
Last-minute insurance verification issues and appointment cancellations
Inconsistent patient experiences ranging from dissatisfaction to highly positive reviews

"Dr. Edward Onuma provides exceptional professionalism, kindness, patience and support! Throughout the years, both Dr. Onuma and his Assistant Nancy have consistently provided excellent patient care."

— Patient review on Birdeye

"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..."

— Patient review on Yelp/MapQuest

"Went and booked an appointment with them and everything went fine then. But then they call me the day before my appointment and tell me that they can't take my insurance even though my insurance..."

— Patient review on Yelp

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