Browse Health
Gastroenterologist (digestive)
39 years of experience
Accepting new patients
License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. Dennis Zai:

View the full profile to get information on:

  1. Qualifications
  2. What's important to you

View full profile

Patient Reviews

Patient comments (1)

The overall average patient rating of Dr. Dennis Zai is Good. Dr. Zai has been reviewed by 3 patients who have provided 1 comments. The rating is 3.5 out of 5 stars.

Specialties & Research

Dr. Dennis Zai, MD is board certified in Gastroenterology.

  • He has special expertise in 5 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Constipation
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. Zai graduated from University of Illinois at Chicago. He has 1 awards.

Castle Connolly's Top Doctors™ (2012 - 2013)


Dr. Zai has 11 hospital affiliations:

  • John Muir Medical Center, Walnut Creek Campus 
  • John Muir Medical Center, Concord Campus 


  • Spanish
  • German
  • French
  • Armenian
  • Mandarin
  • Chinese
  • English

Similar doctors nearby

Dr. Kalyani Maganti

Internal Medicine
14 years experience
Antioch, CA

Dr. Alex Aslan

26 years experience
Concord, CA

Dr. Varujan Keledjian

31 years experience
Antioch, CA

Dr. Ram Gollapudi

Antioch, CA

Dr. William Hou

Internal Medicine
Antioch, CA

Dr. Suk Seo

Internal Medicine
13 years experience
Antioch, CA
Search All Similar Doctors
Additional Information
Dr. Dennis Zai MD is a male Internist, has 39 years of experience and practices in Gastroenterology.
Where does Dr. Dennis Zai practice?
Dr. Dennis Zai has 1 office location.
Dr. Dennis Zai practices Gastroenterology near Antioch, CA.
See Antioch Gastroenterologists.