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Dr. Andrew Duffy, MD

Accepting New Patients

(1 Rating)

Specializes in: Bariatric Surgery and General Surgery

University of Massachusetts Medical School (1996)

Professional interests include: minimally invasive surgery, acid reflux (GERD), gastroparesis, and more.

111 Goose Lane
Guilford, CT 06437

(203) 785-6060

Dr. Andrew Duffy, MD is a bariatric surgeon in Guilford, CT specializing in bariatric surgery and general surgery. He graduated from University of Massachusetts Medical School in 1996 and has 28 years of experience. Dr. Andrew Duffy, MD is affiliated with Yale Medicine, Yale University and Yale New Haven Health.

Office Locations

Address:

111 Goose Lane
Guilford, CT 06437

Address:

2000 Post Road Suite 101
Fairfield, CT 06824

Address:

40 Temple Street Suite 7b
New Haven, CT 06510

Address:

800 Boston Post Road Building 3
Guilford, CT 06437

Some issues Dr. Andrew Duffy, 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.

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 (see more mentions in the news)

“It prevents doctors from getting hurt in their hands, wrists, neck, feet, backs when they stand for long-hour procedures with uncomfortable positions," said Andrew J. Duffy, associate surgical...”—"How robotic surgeries are transforming patient care", Yale News, September 2024

“The seminars are presented by Dr. Andrew Duffy, director of bariatric and metabolic surgery for the Yale New Haven Health System, and Dr. Saber Ghiassi Bridgeport Hospital site director of the Yale...”—"Office hosts talk on weight-loss surgert", Associated Press News, July 2017

“"This designation is a testament to the dedication of a team that includes board-certified bariatric surgeons, specially trained nurses, dietitians and others," said Dr. Andrew Duffy, bariatric...”—"Bridgeport bariatric program gets national accreditation", Associated Press News, March 2017

doctor visit	198
gastrointestinal procedures	9
hospital care	11
inpatient care	11
minimally invasive procedures	10

**Gender**
Male	75
Female	104

**Ethnicity**
Non-Hispanic White	135
Black	24
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	61
From 75 to 84	32
85 and over	11
Less than 65	75

Hypertension	69
High Cholesterol	56
Stroke	0
Ischemic Heart Disease	30
Depression	36
Chronic Kidney Disease	30
Asthma	15
Osteoperosis	9
Atrial Fibrilation	9
Heart Failure	19
Chronic Obstructive Pulmonary Disease	12
Diabetes	37
Dementia	0
Cancer	14

abdominal surgery	14
doctor visit	220
gastrointestinal procedures	60
minimally invasive procedures	61
weight management	11

**Gender**
Male	89
Female	110

**Ethnicity**
Non-Hispanic White	158
Black	21
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	69
From 75 to 84	41
85 and over	11
Less than 65	78

Hypertension	75
High Cholesterol	57
Stroke	0
Ischemic Heart Disease	31
Depression	35
Chronic Kidney Disease	24
Asthma	19
Osteoperosis	14
Atrial Fibrilation	14
Heart Failure	15
Chronic Obstructive Pulmonary Disease	15
Diabetes	37
Dementia	0
Cancer	15

doctor visit	192
gastrointestinal procedures	46
minimally invasive procedures	47
weight management	13

**Gender**
Male	158
Female	206

**Ethnicity**
Non-Hispanic White	284
Black	44
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	156
From 75 to 84	68
85 and over	22
Less than 65	118

Hypertension	70
High Cholesterol	65
Stroke	0
Ischemic Heart Disease	28
Depression	31
Chronic Kidney Disease	29
Asthma	19
Osteoperosis	12
Atrial Fibrilation	7
Heart Failure	13
Chronic Obstructive Pulmonary Disease	13
Diabetes	37
Dementia	7
Cancer	16

abdominal surgery	25
doctor visit	230
gastrointestinal procedures	55
minimally invasive procedures	45
open surgery	10

**Gender**
Male	92
Female	124

**Ethnicity**
Non-Hispanic White	181
Black	19
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	102
From 75 to 84	49
85 and over	16
Less than 65	49

Hypertension	68
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	31
Depression	27
Chronic Kidney Disease	32
Asthma	27
Osteoperosis	11
Atrial Fibrilation	11
Heart Failure	16
Chronic Obstructive Pulmonary Disease	11
Diabetes	32
Dementia	5
Cancer	17

abdominal surgery	12
doctor visit	225
gastrointestinal procedures	56
minimally invasive procedures	57

**Gender**
Male	87
Female	112

**Ethnicity**
Non-Hispanic White	163
Black	15
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	92
From 75 to 84	52
85 and over	11
Less than 65	44

Hypertension	72
High Cholesterol	52
Stroke	0
Ischemic Heart Disease	35
Depression	33
Chronic Kidney Disease	30
Asthma	18
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	14
Chronic Obstructive Pulmonary Disease	14
Diabetes	32
Dementia	10
Cancer	18

abdominal surgery	17
doctor visit	180
gastrointestinal procedures	45
minimally invasive procedures	46
plastic surgery procedures	23
reconstructive surgery	23
tissue transfer	23

**Gender**
Male	79
Female	92

**Ethnicity**
Non-Hispanic White	149
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	84
From 75 to 84	45
85 and over	11
Less than 65	31

Hypertension	69
High Cholesterol	65
Stroke	0
Ischemic Heart Disease	35
Depression	32
Chronic Kidney Disease	32
Asthma	16
Osteoperosis	12
Atrial Fibrilation	15
Heart Failure	16
Chronic Obstructive Pulmonary Disease	11
Diabetes	26
Dementia	12
Cancer	18

abdominal surgery	12
doctor visit	204
gastrointestinal procedures	38
minimally invasive procedures	39

**Gender**
Male	102
Female	87

**Ethnicity**
Non-Hispanic White	158
Black	0
Hispanic	0
Asian	0
Other	12
Native American	0

**Age**
From 65 to 74	87
From 75 to 84	53
85 and over	0
Less than 65	0

Hypertension	68
High Cholesterol	68
Stroke	0
Ischemic Heart Disease	35
Depression	29
Chronic Kidney Disease	34
Asthma	14
Osteoperosis	12
Atrial Fibrilation	9
Heart Failure	17
Chronic Obstructive Pulmonary Disease	16
Diabetes	28
Dementia	6
Cancer	19

abdominal surgery	15
doctor visit	107
gastrointestinal procedures	32
minimally invasive procedures	33

**Gender**
Male	75
Female	70

**Ethnicity**
Non-Hispanic White	123
Black	11
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	70
From 75 to 84	28
85 and over	11
Less than 65	36

Hypertension	64
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	33
Depression	32
Chronic Kidney Disease	36
Asthma	19
Osteoperosis	15
Atrial Fibrilation	10
Heart Failure	18
Chronic Obstructive Pulmonary Disease	13
Diabetes	29
Dementia	8
Cancer	12

doctor visit	250
gastrointestinal procedures	44
minimally invasive procedures	45

Average Medicare Procedure Volume From 2013 - 2021

Volume of procedures performed by Dr. Andrew Duffy, MD for Medicare patients.

The highest averages for the top procedures that Dr. Andrew Duffy, MD treated as a bariatric surgeon in Guilford, CT were gastrointestinal procedures, minimally invasive procedures, reconstructive surgery and plastic surgery procedures.

abdominal surgery	16
doctor visit	202
gastrointestinal procedures	45
hospital care	11
inpatient care	11
minimally invasive procedures	44
open surgery	10
plastic surgery procedures	23
reconstructive surgery	23
tissue transfer	23
weight management	12

Average Medicare Patient Data From 2013 - 2021

Information about Medicare patients treated by Dr. Andrew Duffy, MD.

**Gender**
Female	90
Male	75

**Ethnicity**
Black / African American	13
Asian / Pacific Islander	0
Non-Hispanic White	135
Hispanic	0
Native American / Alaskan Native	0
Other	1

**Age**
85 and over	9
75 to 84	36
Less than 65	43
65 to 74	72

Average of Total of Conditions of Medicare patients treated by Dr. Andrew Duffy, MD From 2013 - 2021

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

Hypertension	55
High Cholesterol	48
Stroke	0
Ischemic Heart Disease	25
Depression	25
Chronic Kidney Disease	24
Asthma	14
Osteoporosis	9
Heart Failure	12
Chronic Obstructive Pulmonary Disease	10
Diabetes	25
Atrial Fibrillation	8
Dementia	4
Cancer	12

Education & Training

Dr. Andrew Duffy, MD graduated from University of Massachusetts Medical School in 1996. He completed residency at University of Massachusetts Affiliated Hospitals. He has a state license in Connecticut.

Medical School: University of Massachusetts Medical School (1996)

Residency: University of Massachusetts Affiliated Hospitals

Licensed In: Connecticut

Affiliations & Hospitals

Dr. Andrew Duffy, MD is associated with these hospitals and organizations:

Yale Medicine

Yale University

Yale New Haven Health

Insurance Information

Please note: Insurance information may change at any time, and the provider may accept your insurance plan even if it is not listed below. Please contact the provider's office to confirm that your insurance is accepted.

Dr. Andrew Duffy, MD appears to accept the following insurance providers: CorVel, Great-West Healthcare, WellCare, MultiPlan, Community Care Network (CCN), United Healthcare, Aetna, TRICARE, Oxford Health Plans, Medicare, Consumer Health Network, Medicaid, Humana, Cigna, Anthem, ConnectiCare, Focus Health Solutions, Prime Health, First Health, Private Healthcare Systems (PHCS), COMPWORKS, HEALTHCARE VALUE MANAGEMENT, MANAGED COMP, HUSKY and PREFERRED HEALTH WORKS.

Insurance Accepted by Provider includes:

According to our sources, Dr. Andrew Duffy, MD accepts the following insurance providers:

CorVel

Great-West Healthcare

WellCare

MultiPlan

Community Care Network (CCN)

United Healthcare

Aetna

TRICARE

Oxford Health Plans

Medicare

Consumer Health Network

Medicaid

Humana

Cigna

Anthem

ConnectiCare

Focus Health Solutions

Prime Health

First Health

Private Healthcare Systems (PHCS)

COMPWORKS

HEALTHCARE VALUE MANAGEMENT

MANAGED COMP

HUSKY

PREFERRED HEALTH WORKS

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Ratings & Reviews

Dr. Andrew Duffy, MD has an exceptional overall rating with an average of 5.0 out of 5 stars based on 1 ratings. We collect ratings and reviews of Dr. Andrew Duffy, MD from all over the web to help you find the right in Guilford, CT.

Overall Rating

(1 Rating)

Leave a Review

Reviews Left On DocSpot

Overall Rating: 5.0 2017-02-10

Having read these reviews, I am very sorry I didn't provide a review after Dr. Duffy removed a tumor from my stomach in 2008.   I had none of the experiences these reviewers have listed. 

I found him to be thoughtful, considerate and very interested in my health and well-being.     Overall I have nothing but good things to say about Dr. Duffy.

General Payments

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

**Payments by Company**
Intuitive Surgical, Inc.	$94,225 Da Vinci Surgical System $75,125	DA VINCI SP $19,100
Davol Inc.	$13,435 SURGICAL $3,085	PHASIX $193	DAV-Phasix $122	DAV-BARD Mesh Perfix $114	DAV-VENTRALIGHT $74	Other $9,847
Covidien LP	$12,881 ProGrip $5,613	Endo Stapling $1,877	Vsiii $1,600	ReliaTack $174	Parietex $132	Other $3,484
Ethicon US, LLC	$10,264 STRATAFIX $8,180	OtherNA $1,692	ECHELON ENDOPATH $224	Endoscopy: Endocutters $93	Mega Power $48	Other $26
Medical Device Business Services, Inc.	$2,888 Harmonic $72	$2,815
Other	$10,231 AirSeal $2,000	NEEDLE HOLDER, 'KOH', MACRO $750	Dextile $428	AbsorbaTack $374	NASCOBAL CYANOCOBALAMIN, USP $336	Other $6,344

**Types of Payments**
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$41,688
Travel and Lodging	$33,346
Education	$27,617
Consulting Fee	$17,374
Food and Beverage	$15,999
Other	$7,900

Research Payments

Dr. Andrew Duffy, MD has received 3 research payments totaling $2,651.

Biography

Dr. Andrew Duffy is a specialist in general surgery. Dr. Duffy is a graduate of the University of Massachusetts Medical School. He is affiliated with Yale New Haven Health.