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

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Dr. Theodore Sy is a gastroenterologist who focuses on diagnosing and treating disorders of the digestive system. He earned his medical degree from Northwestern University The Feinberg School of Medicine and has been practicing for 23 years. Dr. Sy holds board certification in internal medicine from the American Board of Internal Medicine. He speaks English fluently.

Dr. Sy practices at MemorialCare Saddleback Medical Center in Laguna Hills, California. His expertise includes treating colon polyps, hemorrhoids, and diverticular disease. He performs colonoscopy procedures and lower GI endoscopy to help diagnose digestive conditions. Patients have given him an average rating of 4.4 out of 5 on Vitals.

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

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Showing 1 to 10 of 18 reviews

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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

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

December 9th, 2024

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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

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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

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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

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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

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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

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Knowledgeable, professional, efficient, kind.

December 14th, 2019

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

August 11th, 2019

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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	Ashley Anderson, APRN	Chimdi Mfebe, APRN	Rebecca Humphries, 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	Little Rock , AR	SACRAMENTO , CA
Med School: Northwestern University The Feinberg School of Medicine	Med School: East Tennessee State University - Quillen College of Medicine	Med School: Chamberlain University College of Nursing	Med School: Emory University
Current Profile	View Profile	View Profile	View Profile

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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

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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.
How can I make an appointment with Dr. Theodore Sy?: You can find contact information for Dr. Theodore Sy here on Vitals.
Does Dr. Theodore Sy accept my insurance?: You can see the insurance plans that Dr. Theodore Sy accepts on their Vitals profile.
What languages does Dr. Theodore Sy speak?: Dr. Theodore Sy speaks English.
Which hospitals is Dr. Theodore Sy affiliated with?: Dr. Theodore Sy is affiliated with Memorialcare Saddleback Medical Center.

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