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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. Thomas O'Brien:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. Thomas O'Brien is Excellent. Dr. O'Brien has been reviewed by 3 patients who have provided 0 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 2.3
Promptness 3.7
Courteous Staff 3.7
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. Thomas O'Brien, 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. O'Brien graduated from Saint Louis University.


Dr. O'Brien has 3 hospital affiliations:

  • California Pacific Medical Center - Davies Campus 
  • Kaiser Permanente Medical Center San Rafael 
  • San Rafael Medical Center 

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Additional Information
Dr. Thomas Kevin O'Brien MD is a male Internist, has 46 years of experience and practices in Gastroenterology.
Where does Dr. Thomas K. O'Brien practice?
Dr. Thomas O'Brien has 1 office location.
Dr. Thomas O'Brien practices Gastroenterology near San Rafael, CA.
See San Rafael Gastroenterologists.