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Dr. Theodore Y. Sy, MD

Accepting New Patients

(Dr. Theodore Sy, MD)

(523 Ratings)

Specializes in: Adult Gastroenterology

Northwestern University, Feinberg School of Medicine (2003)

26538 MOULTON PARKWAY SUITE 38E
LAGUNA HILLS, CA 92653

1-877-696-3622

Dr. Theodore Y. Sy, MD is a gastroenterologist in LAGUNA HILLS, CA specializing in adult gastroenterology. He graduated from Northwestern University, Feinberg School of Medicine in 2003 and has 23 years of experience. Dr. Theodore Y. Sy, MD is affiliated with Saddleback Medical Center, MemorialCare, MemorialCare Medical Group and Edinger Medical Group MemorialCare Independent Physicians.

Office Locations

26538 MOULTON PARKWAY SUITE 38E
LAGUNA HILLS, CA 92653

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15 Mareblu #100 Aliso
Viejo, CA 92656

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Noteworthy Medicare Patient Procedures Performed by Dr. Theodore Y. Sy, MD in 2024

Click on any procedure below to see further details on volume and pricing among Medicare patients.

Top 5%

By Affordability:

blood draw

blood draw for lab tests

phlebotomy for lab tests

venipuncture

In 2024, Dr. Theodore Y. Sy, MD had a list price for blood draw, blood draw for lab tests, phlebotomy for lab tests, and venipuncture (phlebotomy) that was lower than the list prices billed to Medicare by 95% of providers in related specialties within California. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

doctor visit	17

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2013 were blood draw, removal of lesion (e.g. growth), minimally invasive procedures and diagnostic procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

blood draw	18
diagnostic procedures	13
doctor visit	33
gastrointestinal procedures	13
minimally invasive procedures	13
removal of lesion (e.g. growth)	13

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	22
Female	27

**Ethnicity**
Non-Hispanic White	33
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	33
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2013

Hypertension	63
High Cholesterol	45
Stroke	0
Ischemic Heart Disease	24
Depression	0
Chronic Kidney Disease	39
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	41
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

doctor visit	59

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	31
Female	31

**Ethnicity**
Non-Hispanic White	49
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	40
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2014

Hypertension	45
High Cholesterol	40
Stroke	0
Ischemic Heart Disease	29
Depression	0
Chronic Kidney Disease	19
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	23
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2015 were removal of lesion (e.g. growth), minimally invasive procedures, diagnostic procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

diagnostic procedures	60
doctor visit	53
gastrointestinal procedures	60
minimally invasive procedures	60
removal of lesion (e.g. growth)	60

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	72
Female	80

**Ethnicity**
Non-Hispanic White	114
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	102
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2015

Hypertension	49
High Cholesterol	38
Stroke	0
Ischemic Heart Disease	17
Depression	24
Chronic Kidney Disease	24
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	21
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2016 were removal of lesion (e.g. growth), minimally invasive procedures, diagnostic procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

blood draw	35
diagnostic procedures	53
doctor visit	57
gastrointestinal procedures	53
minimally invasive procedures	53
removal of lesion (e.g. growth)	53

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	36
Female	46

**Ethnicity**
Non-Hispanic White	56
Black	0
Hispanic	13
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	53
From 75 to 84	15
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2016

Hypertension	45
High Cholesterol	38
Stroke	0
Ischemic Heart Disease	21
Depression	23
Chronic Kidney Disease	24
Asthma	13
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	23
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2017 were blood draw, removal of lesion (e.g. growth), minimally invasive procedures and diagnostic procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

blood draw	46
diagnostic procedures	40
doctor visit	77
gastrointestinal procedures	40
minimally invasive procedures	40
removal of lesion (e.g. growth)	40

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	43
Female	59

**Ethnicity**
Non-Hispanic White	68
Black	0
Hispanic	0
Asian	18
Other	0
Native American	0

**Age**
From 65 to 74	74
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2017

Hypertension	46
High Cholesterol	37
Stroke	0
Ischemic Heart Disease	23
Depression	23
Chronic Kidney Disease	26
Asthma	0
Osteoperosis	11
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	27
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2018 were removal of lesion (e.g. growth), minimally invasive procedures, diagnostic procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

blood draw	19
diagnostic procedures	87
doctor visit	58
gastrointestinal procedures	87
minimally invasive procedures	87
removal of lesion (e.g. growth)	87

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	50
Female	56

**Ethnicity**
Non-Hispanic White	84
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	78
From 75 to 84	13
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2018

Hypertension	42
High Cholesterol	42
Stroke	0
Ischemic Heart Disease	17
Depression	20
Chronic Kidney Disease	21
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	10
Chronic Obstructive Pulmonary Disease	0
Diabetes	25
Dementia	0
Cancer	18

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2019 were removal of lesion (e.g. growth), minimally invasive procedures, diagnostic procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

blood draw	28
diagnostic procedures	85
doctor visit	60
gastrointestinal procedures	85
minimally invasive procedures	85
removal of lesion (e.g. growth)	85

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	48
Female	57

**Ethnicity**
Non-Hispanic White	82
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	76
From 75 to 84	16
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2019

Hypertension	50
High Cholesterol	48
Stroke	0
Ischemic Heart Disease	21
Depression	21
Chronic Kidney Disease	15
Asthma	0
Osteoperosis	10
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	19
Dementia	0
Cancer	14

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2020 were removal of lesion (e.g. growth), minimally invasive procedures, diagnostic procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

blood draw	44
diagnostic procedures	66
doctor visit	99
gastrointestinal procedures	66
minimally invasive procedures	66
removal of lesion (e.g. growth)	66

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	49
Female	65

**Ethnicity**
Non-Hispanic White	85
Black	0
Hispanic	13
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	87
From 75 to 84	13
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2020

Hypertension	40
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	18
Depression	14
Chronic Kidney Disease	18
Asthma	0
Osteoperosis	11
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	26
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2021 were removal of lesion (e.g. growth), minimally invasive procedures, diagnostic procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

blood draw	35
diagnostic procedures	93
doctor visit	100
gastrointestinal procedures	93
minimally invasive procedures	93
removal of lesion (e.g. growth)	93

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	63
Female	64

**Ethnicity**
Non-Hispanic White	90
Black	0
Hispanic	16
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	91
From 75 to 84	22
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2021

Hypertension	52
High Cholesterol	49
Stroke	0
Ischemic Heart Disease	23
Depression	23
Chronic Kidney Disease	22
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	24
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2022 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

blood draw	36
diagnostic procedures	95
doctor visit	105
gastrointestinal procedures	106
minimally invasive procedures	106
preventive care	11
removal of lesion (e.g. growth)	95

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	54
Female	78

**Ethnicity**
Non-Hispanic White	98
Black	0
Hispanic	0
Asian	17
Other	0
Native American	0

**Age**
From 65 to 74	84
From 75 to 84	36
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2022

Hypertension	57
High Cholesterol	63
Stroke	0
Ischemic Heart Disease	13
Depression	18
Chronic Kidney Disease	14
Asthma	0
Osteoperosis	13
Atrial Fibrilation	11
Heart Failure	0
Chronic Obstructive Pulmonary Disease	13
Diabetes	23
Dementia	0
Cancer	16

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2023 were removal of lesion (e.g. growth), minimally invasive procedures, diagnostic procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

blood draw	18
diagnostic procedures	91
doctor visit	77
gastrointestinal procedures	91
minimally invasive procedures	91
removal of lesion (e.g. growth)	91

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	56
Female	77

**Ethnicity**
Non-Hispanic White	98
Black	0
Hispanic	0
Asian	13
Other	0
Native American	0

**Age**
From 65 to 74	89
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2023

Hypertension	55
High Cholesterol	66
Stroke	0
Ischemic Heart Disease	11
Depression	20
Chronic Kidney Disease	17
Asthma	0
Osteoperosis	16
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	12
Diabetes	19
Dementia	0
Cancer	12

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA during 2024 were removal of lesion (e.g. growth), minimally invasive procedures, diagnostic procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

blood draw	23
diagnostic procedures	89
doctor visit	113
gastrointestinal procedures	89
minimally invasive procedures	89
removal of lesion (e.g. growth)	89

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	71
Female	86

**Ethnicity**
Non-Hispanic White	123
Black	0
Hispanic	16
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	99
From 75 to 84	44
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD in 2024

Hypertension	60
High Cholesterol	75
Stroke	8
Ischemic Heart Disease	17
Depression	23
Chronic Kidney Disease	18
Asthma	11
Osteoperosis	20
Atrial Fibrilation	12
Heart Failure	7
Chronic Obstructive Pulmonary Disease	9
Diabetes	25
Dementia	0
Cancer	21

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Theodore Y. Sy, MD for Medicare patients.

The highest averages for the top procedures that Dr. Theodore Y. Sy, MD treated as a gastroenterologist in LAGUNA HILLS, CA were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

blood draw	30
diagnostic procedures	70
doctor visit	69
gastrointestinal procedures	71
minimally invasive procedures	71
preventive care	11
removal of lesion (e.g. growth)	70

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Theodore Y. Sy, MD.

**Gender**
Male	45
Female	55

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	3
Non-Hispanic White	75
Hispanic	4
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	0
75 to 84	12
Less than 65	0
65 to 74	69

Average of Total of Conditions of Medicare patients treated by Dr. Theodore Y. Sy, MD From 2012 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. Theodore Y. Sy, MD treated were hypertension, high cholesterol, diabetes and chronic kidney disease.

Hypertension	46
High Cholesterol	45
Stroke	0
Ischemic Heart Disease	18
Depression	16
Chronic Kidney Disease	19
Asthma	1
Osteoporosis	6
Heart Failure	1
Chronic Obstructive Pulmonary Disease	2
Diabetes	22
Atrial Fibrillation	1
Cancer	6
Dementia	0

Education & Training

Dr. Theodore Y. Sy, MD graduated from Northwestern University, Feinberg School of Medicine in 2003. He completed residency at University of California, Irvine Affiliated Hospitals. He is certified by the American Board of Internal Medicine: Gastroenterology and has a state license in California.

Medical School: Northwestern University, Feinberg School of Medicine (2003)

Residency: University of California, Irvine Affiliated Hospitals (2007)

Board Certification: American Board of Internal Medicine: Gastroenterology

Licensed In: California

Ratings & Reviews

Dr. Theodore Y. Sy, MD has an exceptional overall rating with an average of 4.89 out of 5 stars based on 523 ratings. We collect ratings and reviews of Dr. Theodore Y. Sy, MD from all over the web to help you find the right in LAGUNA HILLS, CA.

4.89

Overall Rating

(523 Ratings)

Leave a Review

Reviews Left On DocSpot

Overall Rating: 1.0 2023-02-24

I wish I could do zero stars or negative if possible. Do not go here. Worst gastro in orange county. He cares about money and not patient health.

General Payments

These charts describe general payments received by Dr. Theodore Y. Sy, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
AbbVie Inc.	$1,897 Skyrizi $1,401	Rinvoq $402	Humira $74	Creon $20
AbbVie, Inc.	$493 Humira $309	Viekira $86	Creon $47	Mavyret $22	Moderiba $17	Other $13
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$470 XIFAXAN $304	Trulance $92	Uceris $74
Gilead Sciences Inc	$457 $457
Gilead Sciences, Inc.	$439 Epclusa $24	$415
Other	$3,773 DUPIXENT $264	LINZESS $211	ENTYVIO $202	REZDIFFRA $201	OMVOH $197	Other $2,698

**Types of Payments**
Food and Beverage	$7,402
Education	$127

Biography

Dr. Theodore Sy is an adult gastroenterology specialist in Laguna Hills, CA and Viejo, CA. After attending Northwestern University, Feinberg School of Medicine, he completed his residency training at a hospital affiliated with the University of California, Irvine. Dr. Sy is rated highly by his patients. He is professionally affiliated with Saddleback Medical Center and MemorialCare Medical Group. According to Doctor.com, Dr. Sy is currently accepting new patients at his office in LAGUNA HILLS, CA.