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Internist, Gastroenterologist (digestive)
9 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).

Patient Reviews

Patient comments (2)

The overall average patient rating of Dr. Theodore Sy is Average. Dr. Sy has been reviewed by 2 patients who have provided 2 comments. The rating is 3 out of 5 stars.

Patient Ratings
Ease of Appointment 3.0
Promptness 3.5
Courteous Staff 3.0
Accurate Diagnosis 3.0
Bedside Manner 3.0
Spends Time with Me 3.0
Follows Up After Visit 3.0

Specialties & Research

Dr. Theodore Sy, MD is board certified in Internal Medicine and 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. Sy graduated from Northwestern University, Chicago.


Dr. Sy has 3 hospital affiliations:

  • Mission Hospital 
  • South Coast Medical Center/Adventist Health 
  • University of California 


  • English

> > > > Dr. Theodore Sy, MD

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Additional Information
Dr. Theodore Sy MD is a male Internist, has 9 years of experience and practices in Internal Medicine and Gastroenterology.
Where does Dr. Theodore Sy practice?
Dr. Theodore Sy has 1 office location.
Dr. Theodore Sy practices Internal Medicine and Gastroenterology near Aliso Viejo, CA.
See Aliso Viejo Internists and Aliso Viejo Gastroenterologists.