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Dr. Benjamin Y. Leong, MD

(Dr. Benjamin Leong, M.D.)

(No ratings)

Specializes in: Bariatric Surgery and General Surgery
Professional interests include: minimally invasive surgery, robotic surgery, obesity, and more.
3660 Park Sierra Drive Suite 105
Riverside, CA 92505

Dr. Benjamin Y. Leong, MD is a bariatric surgeon in Corona, CA specializing in bariatric surgery and general surgery. Dr. Benjamin Y. Leong, MD is affiliated with Riverside Community Hospital.

View Doctor's Full Profile (951) 278-8870

Office Locations

2083 Compton Avenue Suite 104
Corona, CA 92881
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3660 Park Sierra Drive Suite 105
Riverside, CA 92505
(951) 278-8870
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Some issues Dr. Benjamin Y. Leong, MD can help you with:

Gastric Bypass Surgery

Gastric bypass surgery is a procedure that promotes weight loss by reducing the stomach and altering how the digestive system absorbs and processes food. The procedure treats morbid obesity, where one's weight impairs day-to-day function or poses serious health risks. Gastric bypass surgery is used only after other weight loss treatments are unsuccessful.

Generally, gastric bypass surgery is performed on patients who have a BMI of 40 or greater, or a BMI of 35 or greater with a weight-related health condition such as type 2 diabetes. Bariatric surgeons frequently expect patients to first attempt natural weight loss for about six months to prove to the surgeon that the patient is capable of maintaining a post-surgery diet and exercise regimen.

For obese patients, gastric bypass surgery has many potential health and weight benefits. Gastric bypass surgery restricts the amount of food the stomach contains, as well as:

  • Reduces the calories the stomach absorbs
  • Alters gastrointestinal hormones, which help to heal obesity-induced metabolic syndrome
  • Suppresses appetite
  • Alleviates conditions caused or exacerbated by obesity, such as obstructive sleep apnea, heart disease, and type 2 diabetes
  • Contributes to mental health by improving self-esteem

During gastric bypass surgery, the stomach is stapled to reduce its size, and a small hole is created in the stomach and attached to the middle section of the small intestine. This direct connection between the stomach and the middle of the small intestine creates a channel for some food to bypass the normal route. By bypassing the upper small intestine and larger region of the stomach, food is not fully absorbed and patients do not retain the same amount of calories as before. This procedure is also sometimes referred to as "Roux-en-Y" gastric bypass surgery. Some bariatric surgeons may perform a "laparoscopic bypass" which uses a tiny camera (laparoscope) to guide the procedure.

Gastric bypass surgery is performed with general anesthesia and as preparation, a liquid diet is required for two weeks prior to undergoing the surgery. After the surgery, patients will spend about two days in the hospital and may miss work for two to three weeks. In the first month after the surgery, patients are only able to consume small portions of liquid or soft food. Even after reintroducing solid food, patients feel full quickly, sometimes after eating just two or three tablespoons. Some patients experience "dumping syndrome" (rapid processing of food into the small intestine), which is common during the recovery process. Gastric bypass surgery patients must also make permanent lifestyle changes. For example, gastric bypass patients are required to take vitamins for life after surgery and required to forever avoid certain foods, such as alcohol, sugar, and high fat food.

While the gastric bypass recovery process can be challenging, surgery results are usually swift: most gastric bypass surgery patients lose nearly half to two thirds of their starting weight within two years of surgery.

Robotic Surgery

Robotic surgery is a type of minimally invasive surgery, using a tiny opening to get inside the body instead of making a large cut. It uses small tools attached to a thin robotic arm, which is controlled by the surgeon. Robotic surgery may be referred to by the specific kind of robot that is used. The most advanced robot currently in use is called the da Vinci, and surgery using it is sometimes called da Vinci surgery.

There are many benefits to robotic surgery, both for the patient and the surgeon. Robotic surgery allows for more precise movements and increased control during very delicate surgical procedures. This makes performing surgery accurately much easier for surgeons and reduces fatigue. The smaller 'hand' of the robot can enter the body via a much smaller opening, which reduces the risk of infection and scarring and leads to a faster recovery. The robotic hands also contain tiny moveable cameras among their tools, giving surgeons a much closer view of the procedure than would be possible with traditional surgery.

Weight Loss Surgery (Bariatric Surgery)

Bariatric or weight-loss surgery is a surgical procedure performed to help significantly obese patients lose weight when more traditional methods, such as dieting and exercise, have not helped. Depending on the type, these surgeries change the gastrointestinal tract to limit how much food can be eaten and also change how food is absorbed by the body. Of the various bariatric surgeries available, the most common is gastric bypass.

By far the most common of the gastric bypass surgeries is called Roux-en-Y. During this surgery, part of the stomach and small intestine are detached from the gastrointestinal tract, in order to make the tract smaller. The surgeon divides the stomach into two parts. The working stomach, at the end of the esophagus, is now tiny - only the size of a walnut. This makes patients feel full after eating a small amount of food. Then the small intestine is also divided, and after bypassing a section of the small intestine to reduce food absorption, the intestine is attached to the small stomach pouch. The patient now has a working stomach and intestine like before, only much smaller.

Because gastric bypass is used to treat extreme obesity, it can reduce the risk of some of the problems associated with obesity. Gastric bypass can help treat or reduce the risk for such conditions as heart disease, high blood pressure, sleep apnea, and type 2 diabetes. However, it is a major surgery and also carries risks itself. Any surgery can lead to infection, bleeding, or blood clots, and weight loss surgery in particular carries risks of leaks in the gastrointestinal system, malnutrition, bowel obstructions, and vomiting.

Typically patients are considered candidates for gastric bypass surgery if they have a BMI greater than 40, or sometimes if they have a BMI between 35 and 40 but are suffering from obesity-related illnesses such as diabetes. The outlook is generally good, with most patients losing between 50-75% of their excess weight in 1-2 years. However, patients must follow strict diet guidelines so that the stomach can heal, starting with no food at all, then followed by a liquid diet for some time. For many severely obese patients who have tried strict diets before without success, gastric bypass surgery is the tool that allows them to finally achieve their weight loss and health goals.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2012 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

doctor visit 49
hospital care 210
inpatient care 210

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2013 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

doctor visit 60
hospital care 332
inpatient care 332

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 89
Female 97
Ethnicity
Non-Hispanic White 121
Black 13
Hispanic 32
Asian 0
Other 0
Native American 0
Age
From 65 to 74 65
From 75 to 84 54
85 and over 28
Less than 65 39

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2013

Hypertension 75
High Cholesterol 65
Stroke 10
Ischemic Heart Disease 55
Depression 31
Chronic Kidney Disease 46
Asthma 11
Osteoperosis 7
Atrial Fibrilation 17
Heart Failure 40
Chronic Obstructive Pulmonary Disease 34
Diabetes 45
Dementia 16
Cancer 20

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2014 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

doctor visit 36
hospital care 177
inpatient care 177

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 50
Female 73
Ethnicity
Non-Hispanic White 71
Black 11
Hispanic 28
Asian 0
Other 0
Native American 0
Age
From 65 to 74 45
From 75 to 84 30
85 and over 25
Less than 65 23

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2014

Hypertension 75
High Cholesterol 58
Stroke 9
Ischemic Heart Disease 46
Depression 24
Chronic Kidney Disease 44
Asthma 17
Osteoperosis 0
Atrial Fibrilation 20
Heart Failure 34
Chronic Obstructive Pulmonary Disease 30
Diabetes 45
Dementia 21
Cancer 21

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2015 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

doctor visit 44
hospital care 139
inpatient care 139

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 120
Female 122
Ethnicity
Non-Hispanic White 158
Black 22
Hispanic 40
Asian 0
Other 0
Native American 0
Age
From 65 to 74 106
From 75 to 84 58
85 and over 40
Less than 65 38

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2015

Hypertension 75
High Cholesterol 63
Stroke 13
Ischemic Heart Disease 57
Depression 31
Chronic Kidney Disease 40
Asthma 19
Osteoperosis 12
Atrial Fibrilation 14
Heart Failure 40
Chronic Obstructive Pulmonary Disease 27
Diabetes 45
Dementia 15
Cancer 16

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2016 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

hospital care 154
inpatient care 154

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 41
Female 44
Ethnicity
Non-Hispanic White 65
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 30
From 75 to 84 20
85 and over 17
Less than 65 18

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2016

Hypertension 75
High Cholesterol 62
Stroke 13
Ischemic Heart Disease 38
Depression 29
Chronic Kidney Disease 44
Asthma 20
Osteoperosis 0
Atrial Fibrilation 16
Heart Failure 25
Chronic Obstructive Pulmonary Disease 20
Diabetes 42
Dementia 19
Cancer 14

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2017 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

doctor visit 20
hospital care 151
inpatient care 151

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 48
Female 65
Ethnicity
Non-Hispanic White 88
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 50
From 75 to 84 30
85 and over 20
Less than 65 13

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2017

Hypertension 75
High Cholesterol 57
Stroke 11
Ischemic Heart Disease 48
Depression 26
Chronic Kidney Disease 45
Asthma 13
Osteoperosis 11
Atrial Fibrilation 19
Heart Failure 34
Chronic Obstructive Pulmonary Disease 19
Diabetes 41
Dementia 19
Cancer 16

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2018 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

doctor visit 32
hospital care 157
inpatient care 157

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 41
Female 87
Ethnicity
Non-Hispanic White 89
Black 0
Hispanic 21
Asian 0
Other 0
Native American 0
Age
From 65 to 74 46
From 75 to 84 33
85 and over 25
Less than 65 24

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2018

Hypertension 73
High Cholesterol 52
Stroke 0
Ischemic Heart Disease 43
Depression 37
Chronic Kidney Disease 48
Asthma 9
Osteoperosis 9
Atrial Fibrilation 16
Heart Failure 34
Chronic Obstructive Pulmonary Disease 24
Diabetes 41
Dementia 18
Cancer 14

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2019 were hospital care, inpatient care, thoracic (chest) surgery procedures and open surgery.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

bypass surgery 13
cardiac procedures 26
doctor visit 35
hospital care 100
inpatient care 100
open surgery 26
thoracic (chest) surgery procedures 26

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 55
Female 70
Ethnicity
Non-Hispanic White 80
Black 0
Hispanic 26
Asian 0
Other 0
Native American 0
Age
From 65 to 74 56
From 75 to 84 36
85 and over 17
Less than 65 16

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2019

Hypertension 75
High Cholesterol 66
Stroke 0
Ischemic Heart Disease 51
Depression 29
Chronic Kidney Disease 47
Asthma 10
Osteoperosis 9
Atrial Fibrilation 20
Heart Failure 35
Chronic Obstructive Pulmonary Disease 25
Diabetes 40
Dementia 16
Cancer 14

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2020 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

doctor visit 14
hospital care 88
inpatient care 88

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 43
Female 42
Ethnicity
Non-Hispanic White 55
Black 0
Hispanic 15
Asian 0
Other 0
Native American 0
Age
From 65 to 74 41
From 75 to 84 26
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2020

Hypertension 75
High Cholesterol 72
Stroke 0
Ischemic Heart Disease 56
Depression 18
Chronic Kidney Disease 56
Asthma 0
Osteoperosis 0
Atrial Fibrilation 13
Heart Failure 29
Chronic Obstructive Pulmonary Disease 18
Diabetes 47
Dementia 18
Cancer 16

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2021 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

doctor visit 12
hospital care 126
inpatient care 126

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 39
Female 43
Ethnicity
Non-Hispanic White 62
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 34
From 75 to 84 25
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2021

Hypertension 75
High Cholesterol 62
Stroke 0
Ischemic Heart Disease 46
Depression 33
Chronic Kidney Disease 60
Asthma 0
Osteoperosis 0
Atrial Fibrilation 21
Heart Failure 24
Chronic Obstructive Pulmonary Disease 21
Diabetes 39
Dementia 17
Cancer 20

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2022 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

doctor visit 13
hospital care 66
inpatient care 66

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 25
Female 27
Ethnicity
Non-Hispanic White 37
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 23
From 75 to 84 11
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2022

Hypertension 75
High Cholesterol 75
Stroke 0
Ischemic Heart Disease 46
Depression 23
Chronic Kidney Disease 0
Asthma 0
Osteoperosis 0
Atrial Fibrilation 31
Heart Failure 21
Chronic Obstructive Pulmonary Disease 31
Diabetes 33
Dementia 0
Cancer 29

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA during 2023 were hospital care and inpatient care.

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

hospital care 66
inpatient care 66

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 24
Female 26
Ethnicity
Non-Hispanic White 29
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 18
From 75 to 84 16
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD in 2023

Hypertension 75
High Cholesterol 72
Stroke 0
Ischemic Heart Disease 40
Depression 30
Chronic Kidney Disease 34
Asthma 0
Osteoperosis 0
Atrial Fibrilation 24
Heart Failure 28
Chronic Obstructive Pulmonary Disease 26
Diabetes 40
Dementia 0
Cancer 26

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. Benjamin Y. Leong, MD for Medicare patients.

The highest averages for the top procedures that Dr. Benjamin Y. Leong, MD treated as a bariatric surgeon in Corona, CA were hospital care, inpatient care, thoracic (chest) surgery procedures and open surgery.

bypass surgery 13
cardiac procedures 26
doctor visit 31
hospital care 147
inpatient care 147
open surgery 26
thoracic (chest) surgery procedures 26

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. Benjamin Y. Leong, MD.

Gender
Male 47
Female 58
Ethnicity
Black / African American 3
Asian / Pacific Islander 0
Non-Hispanic White 71
Hispanic 13
Native American / Alaskan Native 0
Other 0
Age
75 to 84 28
85 and over 14
Less than 65 14
65 to 74 42

Average of Total of Conditions of Medicare patients treated by Dr. Benjamin Y. Leong, MD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Benjamin Y. Leong, MD treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension 68
High Cholesterol 58
Stroke 4
Ischemic Heart Disease 43
Depression 25
Chronic Kidney Disease 38
Asthma 8
Osteoporosis 4
Heart Failure 28
Chronic Obstructive Pulmonary Disease 22
Diabetes 38
Atrial Fibrillation 17
Cancer 17
Dementia 13

Education & Training

He completed residency at New York Medical College Affiliated Hospitals. He has a state license in California.

Residency: New York Medical College Affiliated Hospitals

Licensed In: California

Affiliations & Hospitals

Dr. Benjamin Y. Leong, MD is associated with these hospitals and organizations:

Riverside Community Hospital

Ratings & Reviews

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General Payments

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

Payments by Company
Intuitive Surgical, Inc. $27,284 Da Vinci Surgical System
$27,284
Covidien LP $1,792 LigaSure
$459 		ProGrip
$293 		iDrive Ultra
$266 		Tacker
$261 		Signia
$175 		Other
$338
Medtronic, Inc. $1,694 LigaSure
$666 		Signia
$591 		GIA
$275 		Sonicision
$161
Medical Device Business Services, Inc. $1,682 LINX Reflux Management System
$1,161 		PHYSIOMESH
$521
Ethicon Inc. $1,531 ENSEAL Product Family
$1,531
Other $1,298 LINX Reflux Management System
$203 		ECHELON FLEX Stapler
$184 		Endoscopy: Trocars
$125 		RAPAFLO
$106 		AJOVY
$105 		Other
$576
Types of Payments
Education $24,106
Food and Beverage $6,981
Travel and Lodging $4,194

Biography

Dr. Benjamin Leong is a specialist in general surgery and bariatric surgery. He works in Riverside, CA and Corona, CA. After attending the University of Toledo College of Medicine for medical school, he completed his residency training at a hospital affiliated with New York Medical College. His areas of expertise include the following: laparoscopic sleeve gastrectomy, duodenal switch, and roux-en-y gastric bypass. In addition to English, Dr. Leong (or staff) speaks Mandarin, Filipino, and Spanish. He is affiliated with Riverside Community Hospital.

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