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Home > CA Providers > Bariatric Surgeons

Dr. Antonio Kobyashi Coirin, MD

Accepting New Patients

(5 Ratings)

Specializes in: Bariatric Surgery, General Surgery and Trauma Surgery

University of California, Davis, School of Medicine

Professional interests include: minimally invasive surgery, incisional hernia repair, laparoscopic hernia repair, and more.

644 East Harding Way Suite B
Stockton, CA 95204

(209) 244-9191

Dr. Antonio Kobyashi Coirin, MD is a bariatric surgeon in Modesto, CA specializing in bariatric surgery, general surgery and trauma surgery. He graduated from University of California, Davis, School of Medicine. Dr. Antonio Kobyashi Coirin, MD is affiliated with Sutter Health and Central Valley Medical Group.

Office Locations

1001 Sylvan Avenue Suite A
Modesto, CA 95350

(209) 422-6120

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Central Valley Medical Group

1552 Coffee Road Suite 200
Modesto, CA 95355

(209) 248-7168

(209) 846-9641

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Sutter Health

644 East Harding Way Suite B
Stockton, CA 95204

(209) 944-5476

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Some issues Dr. Antonio Kobyashi Coirin, MD can help you with:

Gallbladder Removal Surgery (Cholecystectomy)

The gallbladder is a small, pear-shaped organ on the right side of the upper abdomen, underneath the liver. Its purpose is to store bile, which is used to digest fat. Occasionally, the gallbladder can develop mineral stones, called gallstones. If they are large enough, gallstones can block the ducts in the gallbladder and cause swelling and infection. Gallstones can be treated with lifestyle changes and medication, but sometimes this is not enough. In these cases, it is best to remove the gallbladder before it can cause more serious problems. The surgical removal of the gallbladder is called a cholecystectomy.

Today, most gallbladder surgeries are done laparoscopically. Four tiny incisions are made in the abdomen, and small tools are inserted through these tiny incisions to perform the surgery. Because the incisions are much smaller, recovery time is much faster with this type of surgery. Patients are usually discharged from the hospital the same day. Sometimes, open surgery is used to remove a gallbladder. In this type of surgery, a cut about six inches long is made in the upper right abdomen. After the gallbladder is removed, it is sutured or stapled closed. With open surgery, patients usually stay in the hospital for two to three days to recover before they are discharged.

Gallbladder removal, like any surgery, carries some risks, such as bleeding, infection, or the development of blood clots. Doctors will tell patients how to minimize their risk for complications. After surgery, patients are advised to avoid strenuous activity for several days. They should not soak in a bath until their sutures or staples have been removed. Patients should wash hands before touching the area around the incision. It will take a couple of days until patients feel like themselves again and a few weeks until their scar has healed and faded.

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.

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.

In The News

“According to the documents, Dr. Antonio Coirin - a surgeon in Modesto - was pulled over in September 2018 and blew a.14 blood-alcohol level.”—"Medical Board Looking At Revoking Or Suspending License Of Modesto Surgeon Who Got DUI While On Call", CBS Tampa Bay, November 2021

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Antonio Kobyashi Coirin, MD treated as a bariatric surgeon in Modesto, CA during 2012 were hospital care, inpatient care, bypass surgery and minimally invasive procedures.

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

bypass surgery	19
diagnostic procedures	12
doctor visit	613
excision	12
gastrointestinal procedures	19
hospital care	92
inpatient care	92
minimally invasive procedures	19
open surgery	12
weight management	19

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Antonio Kobyashi Coirin, MD treated as a bariatric surgeon in Modesto, CA during 2013 were hospital care, inpatient care, bypass surgery and minimally invasive procedures.

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

bypass surgery	24
doctor visit	738
gastrointestinal procedures	24
hospital care	112
inpatient care	112
minimally invasive procedures	24
weight management	24

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Male	87
Female	228

**Ethnicity**
Non-Hispanic White	210
Black	0
Hispanic	67
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	103
From 75 to 84	0
85 and over	0
Less than 65	179

Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD in 2013

Hypertension	75
High Cholesterol	52
Stroke	4
Ischemic Heart Disease	27
Depression	33
Chronic Kidney Disease	26
Asthma	18
Osteoperosis	5
Atrial Fibrilation	7
Heart Failure	16
Chronic Obstructive Pulmonary Disease	12
Diabetes	53
Dementia	0
Cancer	5

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Antonio Kobyashi Coirin, MD treated as a bariatric surgeon in Modesto, CA during 2014 were hospital care, inpatient care, bypass surgery and minimally invasive procedures.

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

bypass surgery	24
diagnostic procedures	15
doctor visit	553
excision	15
gastrointestinal procedures	24
hospital care	90
inpatient care	90
minimally invasive procedures	24
open surgery	15
weight management	24

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Male	68
Female	168

**Ethnicity**
Non-Hispanic White	148
Black	29
Hispanic	44
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	80
From 75 to 84	0
85 and over	0
Less than 65	133

Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD in 2014

Hypertension	74
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	29
Depression	36
Chronic Kidney Disease	27
Asthma	19
Osteoperosis	0
Atrial Fibrilation	6
Heart Failure	18
Chronic Obstructive Pulmonary Disease	14
Diabetes	53
Dementia	0
Cancer	7

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

doctor visit	502

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Male	98
Female	292

**Ethnicity**
Non-Hispanic White	228
Black	52
Hispanic	84
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	138
From 75 to 84	24
85 and over	0
Less than 65	228

Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD in 2015

Hypertension	72
High Cholesterol	52
Stroke	0
Ischemic Heart Disease	29
Depression	35
Chronic Kidney Disease	26
Asthma	25
Osteoperosis	0
Atrial Fibrilation	6
Heart Failure	17
Chronic Obstructive Pulmonary Disease	11
Diabetes	48
Dementia	0
Cancer	6

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

doctor visit	419

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Male	39
Female	126

**Ethnicity**
Non-Hispanic White	100
Black	0
Hispanic	38
Asian	0
Other	0
Native American	0

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

Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD in 2016

Hypertension	75
High Cholesterol	50
Stroke	0
Ischemic Heart Disease	29
Depression	38
Chronic Kidney Disease	36
Asthma	30
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	18
Chronic Obstructive Pulmonary Disease	12
Diabetes	50
Dementia	0
Cancer	7

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Antonio Kobyashi Coirin, MD treated as a bariatric surgeon in Modesto, CA during 2017 were minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

doctor visit	255
gastrointestinal procedures	11
minimally invasive procedures	11

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Male	33
Female	95

**Ethnicity**
Non-Hispanic White	82
Black	0
Hispanic	27
Asian	0
Other	0
Native American	0

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

Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD in 2017

Hypertension	70
High Cholesterol	45
Stroke	0
Ischemic Heart Disease	30
Depression	46
Chronic Kidney Disease	42
Asthma	20
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	13
Chronic Obstructive Pulmonary Disease	13
Diabetes	47
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Antonio Kobyashi Coirin, MD treated as a bariatric surgeon in Modesto, CA during 2018 were minimally invasive procedures, gastrointestinal procedures, bypass surgery and weight management.

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

bypass surgery	12
doctor visit	40
gastrointestinal procedures	28
minimally invasive procedures	28
weight management	12

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Male	17
Female	66

**Ethnicity**
Non-Hispanic White	57
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	0
From 75 to 84	0
85 and over	0
Less than 65	48

Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD in 2018

Hypertension	75
High Cholesterol	61
Stroke	0
Ischemic Heart Disease	40
Depression	47
Chronic Kidney Disease	58
Asthma	27
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	16
Chronic Obstructive Pulmonary Disease	20
Diabetes	57
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Antonio Kobyashi Coirin, MD treated as a bariatric surgeon in Modesto, CA during 2019 were minimally invasive procedures, gastrointestinal procedures and weight management.

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

doctor visit	266
gastrointestinal procedures	32
minimally invasive procedures	32
weight management	16

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Male	58
Female	161

**Ethnicity**
Non-Hispanic White	123
Black	0
Hispanic	59
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	76
From 75 to 84	0
85 and over	0
Less than 65	132

Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD in 2019

Hypertension	75
High Cholesterol	54
Stroke	0
Ischemic Heart Disease	31
Depression	41
Chronic Kidney Disease	51
Asthma	24
Osteoperosis	0
Atrial Fibrilation	6
Heart Failure	15
Chronic Obstructive Pulmonary Disease	16
Diabetes	54
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

doctor visit	143

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Male	20
Female	94

**Ethnicity**
Non-Hispanic White	67
Black	0
Hispanic	32
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	0
From 75 to 84	0
85 and over	0
Less than 65	67

Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD in 2020

Hypertension	75
High Cholesterol	59
Stroke	0
Ischemic Heart Disease	31
Depression	46
Chronic Kidney Disease	59
Asthma	12
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	18
Chronic Obstructive Pulmonary Disease	12
Diabetes	63
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

doctor visit	141

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Male	24
Female	74

**Ethnicity**
Non-Hispanic White	60
Black	0
Hispanic	26
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	0
From 75 to 84	0
85 and over	0
Less than 65	58

Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD in 2021

Hypertension	75
High Cholesterol	67
Stroke	0
Ischemic Heart Disease	27
Depression	48
Chronic Kidney Disease	49
Asthma	22
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	27
Chronic Obstructive Pulmonary Disease	15
Diabetes	60
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Antonio Kobyashi Coirin, MD treated as a bariatric surgeon in Modesto, CA during 2022 were minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

doctor visit	142
gastrointestinal procedures	13
minimally invasive procedures	13

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Male	25
Female	74

**Ethnicity**
Non-Hispanic White	51
Black	0
Hispanic	33
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	0
From 75 to 84	0
85 and over	0
Less than 65	64

Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD in 2022

Hypertension	75
High Cholesterol	74
Stroke	0
Ischemic Heart Disease	20
Depression	47
Chronic Kidney Disease	24
Asthma	25
Osteoperosis	12
Atrial Fibrilation	0
Heart Failure	19
Chronic Obstructive Pulmonary Disease	12
Diabetes	47
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Antonio Kobyashi Coirin, MD for Medicare patients.

The highest averages for the top procedures that Dr. Antonio Kobyashi Coirin, MD treated as a bariatric surgeon in Modesto, CA were hospital care, inpatient care, minimally invasive procedures and gastrointestinal procedures.

bypass surgery	19
diagnostic procedures	13
doctor visit	346
excision	13
gastrointestinal procedures	21
hospital care	98
inpatient care	98
minimally invasive procedures	21
open surgery	13
weight management	19

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD.

**Gender**
Female	125
Male	42

**Ethnicity**
Black / African American	7
Asian / Pacific Islander	0
Non-Hispanic White	102
Hispanic	37
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	0
75 to 84	2
Less than 65	97
65 to 74	36

Average of Total of Conditions of Medicare patients treated by Dr. Antonio Kobyashi Coirin, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Antonio Kobyashi Coirin, MD treated were hypertension, high cholesterol, diabetes and depression.

Hypertension	67
High Cholesterol	51
Stroke	0
Ischemic Heart Disease	26
Depression	37
Chronic Kidney Disease	36
Asthma	20
Osteoporosis	1
Heart Failure	16
Chronic Obstructive Pulmonary Disease	12
Diabetes	48
Atrial Fibrillation	2
Dementia	0
Cancer	2

Education & Training

Dr. Antonio Kobyashi Coirin, MD graduated from University of California, Davis, School of Medicine. He completed residency at San Joaquin General Hospital. He is certified by the Surgery - Board Certified and has a state license in California.

Medical School: University of California, Davis, School of Medicine

Residency: San Joaquin General Hospital

Board Certification: Surgery - Board Certified

Licensed In: California

Affiliations & Hospitals

Dr. Antonio Kobyashi Coirin, MD is associated with these hospitals and organizations:

Sutter Health

Central Valley Medical Group

Ratings & Reviews

Dr. Antonio Kobyashi Coirin, MD has an exceptional overall rating with an average of 5.0 out of 5 stars based on 5 ratings. We collect ratings and reviews of Dr. Antonio Kobyashi Coirin, MD from all over the web to help you find the right in Modesto, CA.

Overall Rating

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General Payments

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

**Payments by Company**
Intuitive Surgical, Inc.	$188,730 Da Vinci Surgical System $176,128	DA VINCI SP $12,602
Covidien Sales LLC	$4,396 Access $1,747	Sonicision $1,135	Endo Stapling $726	Synthetic Mesh $235	Vessel Sealing $195	Other $358
Covidien LP	$3,473 LigaSure $878	Parietene $763	Spacemaker $377	Sonicision $375	Battery-Powered Devices $165	Other $916
Ethicon US, LLC	$3,427 Endoscopy: Endocutters $3,225	Energy Harmonic $65	Energy: Harmonic $63	LINX Reflux Management System $44	Echelon; Endopath $17	Other $13
Davol Inc.	$1,378 PHASIX $1,321	Phasix Mesh $14	$44
Other	$4,016 LINX Reflux Management System $1,446	BIO-A Tissue Reinforcement $917	Signia $455	Orbera $314	Sonicision $197	Other $687

**Types of Payments**
Education	$87,500
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$73,500
Travel and Lodging	$28,533
Food and Beverage	$15,887

Biography

Dr. Antonio Coirin sees patients in Modesto, CA and Stockton, CA. His medical specialties are general surgery, bariatric surgery, and trauma surgery. He is a graduate of the University of California, Davis, School of Medicine and a graduate of San Joaquin General Hospital's residency program. Dr. Coirin's areas of expertise include laparoscopic sleeve gastrectomy, roux-en-y gastric bypass, and hiatal hernia. He is rated 5.0 stars (out of 5) by his patients. In addition to English, he speaks Japanese. His professional affiliations include Sutter Health and Central Valley Medical Group. Dr. Coirin has an open panel in Stockton, CA according to Central Valley Medical Group.