Dr. Theodore Sy, MD | Laguna Hills, CA | Gastroenterology

.about .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Dr. Theodore Sy is a gastroenterologist with 23 years of experience specializing in digestive health and disorders of the gastrointestinal system. He earned his medical degree from Northwestern University The Feinberg School of Medicine and holds certification in internal medicine from the American Board of Internal Medicine. Dr. Sy communicates with patients in English.

Dr. Sy practices at MemorialCare Saddleback Medical Center in Laguna Hills, California. His expertise includes treating colon polyps, hemorrhoids, and diverticular disease. He performs colonoscopies and lower gastrointestinal endoscopy procedures to diagnose and treat digestive conditions. Patients have given him an average rating of 4.4 stars for his care.

AI-generated from data on this provider profile.

accepting new patients
4.3

20 Ratings
23 years of experience
46 insurance plans accepted
speaks English
Northwestern University The Feinberg School of Medicine
18 written reviews
1 specialty
12 areas of expertise
2 board certifications
1 hospital affiliation
1 office location
Male

20 ratings & reviews

Sort:

Showing 1 to 10 of 18 reviews

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Excellent listener— came up with plan together. Was clear about next steps. No condescension. Long wait to get in but worth it. Staff was friendly and helpful.

March 26th, 2025

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Dr. Sy is very attentive!! Listened to all my concerns and provided ideas/suggestions!! I would highly recommend Dr. Sy!!

December 9th, 2024

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

This is my consultation visit with Dr. Sy for a colondoscopy after 10 years . I think Dr. Sy is a phenomenal doctor. He is very thorough, polite and courteous. He provided clear This is my first visit with Dr. Sy after 10 years . I think Dr. Sy is a phenomenal doctor. He is very thorough, polite and courteous. He provided clear communication This is my first visit with Dr. Sy after 10 years . I think Dr. Sy is a phenomenal doctor. He is very thorough, polite and courteous. He provided clear communication about my care, answered questions and explained in details.

June 13th, 2023

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

This is my consultation for a colondoscopy procedure with Dr. Sy after 10 years . Dr. Sy had reviewed my records before he discussed his concerns. I think Dr. Sy is a phenomenal doctor. He is very thorough, polite and courteous. He provided clear communication about my care, answered questions and explained in details.

March 21st, 2023

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Three years ago I had a colonoscopy with Dr. Sy. He is a very compassionate man. It was suggested that I have another colonoscopy this year. It was suggested that I had a more intense anesthesia for this next colonoscopy. Between 6-8 phone calls with this office, Angela the nurse was progressively more rude. I am not sure if it is COVID related but I feel she is sick of her job. I asked direct questions and I only received nebulous responses. I am looking for another doctor.

March 16th, 2021

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Dr. Sy is very knowledgeable and caring physician. I would recommend Dr. Sy to whoever is looking for a good GI specialist.

February 24th, 2021

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Dr. Sy has been my gastroenterologist for many years and I credit him and his nurse, Andrea Green with saving my life. They are two of the finest professionals I have had the pleasure to know and good fortune to be a recipient of their critical care.

April 17th, 2020

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Knowledgeable, professional, efficient, kind.

December 14th, 2019

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

He listens, responds to what he hears and explains himself precisely.

August 11th, 2019

.rating-and-reviews .noScriptHide .nojs-show,.truncated [data-rem],blockquote .truncated-text{ display: initial !important}.no-js-hide,.ellipsis { display: none; }.truncated:after {content: '' !important}

Dr Sy took time to explain about my health concerns. I felt better after I left his office, not as worried as I came in. And nurse Andrea is sweeter than sugar. Thank you Team..

August 3rd, 2019

Theodore Sy, MD

26538 Moulton Pkwy Ste 38ELaguna Hills, CA 92653

Tel: (877) 696-3622

Mon8:00 am - 5:00 pm

Tue8:00 am - 5:00 pm

Wed8:00 am - 5:00 pm

Thu8:00 am - 5:00 pm

Fri8:00 am - 5:00 pm

SatClosed

SunClosed


Dr. Theodore Sy, MD	Rachel Oliver, APRN	Ji Soo Choi, APRN	Ashley Anderson, APRN
Gastroenterology	Gastroenterology	Gastroenterology	Gastroenterology
Accepts New Patients	Accepts New Patients	Accepts New Patients	Accepts New Patients
4.3 (20 Ratings)	0 (0 Ratings)	0 (0 Ratings)	0 (0 Ratings)
23 Years of Experience
No Virtual Visit Option	Virtual Visit Available	Virtual Visit Available	Virtual Visit Available
Speaks English	Speaks English	Speaks English	Speaks English
Laguna Hills , CA	SACRAMENTO , CA	SACRAMENTO , CA	SACRAMENTO , CA
Med School: Northwestern University The Feinberg School of Medicine	Med School: University of South Alabama	Med School: New York University	Med School: East Tennessee State University - Quillen College of Medicine
Current Profile	View Profile	View Profile	View Profile

Search for your insurance and plan

Gastroenterology

Acid Reflux Disease (Gastroesophageal Reflux / GERD)
Check-up
Constipation
Heartburn
Hepatitis C
Immunization
Irritable Bowel Syndrome (IBS)
Physical
Ulcerative Colitis
Vaccination
Weight Loss
Weight Loss (non-surgical)

BOARD CERTIFICATIONS

American Board of Internal Medicine

Internal medicine

EDUCATION & TRAINING

Medical School

Northwestern University The Feinberg School of MedicineGraduated in 2003

Ivy Zheng
Nurse Practitioner
| Newport Beach, CA
(0)
Fadela Amine
Nurse Practitioner
| Lighthouse Point, FL
(0)
Mary Guirguis
Gastroenterology
| Anaheim, CA
(0)
Dr. William Tan Nguyen, MD
Gastroenterology
46 Years Exp | Anaheim, CA
(1)
Dr. Donald Steven Furman, MD
Gastroenterology
50 Years Exp | Orange, CA
(1)
Dr. Pundari Kakshudu Chemitiganti, MD
Gastroenterology
54 Years Exp | Newport Beach, CA
(1)
Dr. James Frederick Roy, MD
Gastroenterology
50 Years Exp | Corona, CA
(16)
Dr. Martin Jerry Feldman, MD
Gastroenterology
57 Years Exp | Orange, CA
(1)
Dr. Syeda Sakina Husain, MD
Internal Medicine
30 Years Exp | Anaheim, CA
(3)
Dr. Robert Ianmaurice Fearn
Gastroenterology
| Orange, CA
(0)

Which hospitals is Dr. Theodore Sy affiliated with?: Dr. Theodore Sy is affiliated with Memorialcare Saddleback Medical Center.
What languages does Dr. Theodore Sy speak?: Dr. Theodore Sy speaks English.
Where is Dr. Theodore Sy's office located?: Dr. Theodore Sy's office is located at 26538 Moulton Pkwy Ste 38E, Laguna Hills, CA, 92653.
Does Dr. Theodore Sy accept my insurance?: You can see the insurance plans that Dr. Theodore Sy accepts on their Vitals profile.
Is Dr. Theodore Sy accepting new patients?: Dr. Theodore Sy is accepting new patients on Vitals. View Dr. Theodore Sy's profile on Vitals to make an appointment.

Our provider data is gathered directly from physicians and publicly available databases. Providers who verify their profiles gain the ability to update information, offering additional details about their specialties,education, treated conditions, performed procedures, and accepted insurances.

Reviews on Vitals are submitted by users only. Recognizing the valuable insights these reviews offer into a doctor's reputation, we maintain internal policies and protocols to ensure the quality and accuracy of all reviews. Importantly, providers cannot delete or alter reviews independently. Reviews can only be deleted or changed following an internal assessment by our customer service team.

Your feedback is highly valued and we encourage you to contact our support team should you encounter any issues.

Copyright © 2026 Vitals Consumer Services, LLC. US Patent No. 8, 694, 441. All Rights Reserved.
As more fully set forth in this website's terms of use . (1) nothing contained on or offered by or through this website should be construed as medical advice and should not be relied upon for medical diagnosis or treatment. Vitals Consumer Services, LLC ("Vitals"). the provider of this website, does not recommend or endorse any particular healthcare provider whose information or ratings appear on this website; and (2) Vitals has granted you a limited license to access and use this website for your own noncommercial use. You are not permitted to copy, reproduce, distribute, transmit, mirror, frame, scrape, extract, wrap, create derivative works of, reverse engineer, decompile or disassemble any part or aspect of this website.