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Dr. Denis John Halmi, MD, FACS

Accepting New Patients

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Specializes in: Bariatric Surgery and General Surgery

Semmelweis University Faculty of Medicine (1979)

Professional interests include: gastric bypass surgery, obesity, metabolism, and more.

1300 Hospital Drive Suite 202
Fredericksburg, VA 22401

(540) 741-2955

Dr. Denis John Halmi, MD, FACS is a bariatric surgeon in Fredericksburg, VA specializing in bariatric surgery and general surgery. He graduated from Semmelweis University Faculty of Medicine in 1979 and has 47 years of experience. Dr. Denis John Halmi, MD, FACS is affiliated with Mary Washington Healthcare, StoneSprings Hospital Center, HCA Virginia, Sentara Health and Mary Washington Weight Loss Center.

Office Locations

Mary Washington Weight Loss Center

1300 Hospital Drive Suite 202
Fredericksburg, VA 22401

(540) 741-2955

(540) 741-7824

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HCA Virginia

14904 Jefferson Davis Highway Suite 205
Woodbridge, VA 22191

(703) 595-4566

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Sentara Health

2010 Opitz Boulevard Suite A
Woodbridge, VA 22191

(703) 595-4566

(703) 350-4891

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Some issues Dr. Denis John Halmi, MD, FACS 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

“That one small step brought her to Dr. Denis Halmi, a pioneer in the field of weight-loss surgery and the Medical Director of the Sentara Weight Loss Surgery Center.”—"How One Woman's Weight Loss Journey Was Physically and Emotionally Healing", NBC4 Washington, August 2017

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

doctor visit	193

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

doctor visit	199

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

**Gender**
Male	27
Female	103

**Ethnicity**
Non-Hispanic White	101
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

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

Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS in 2013

Hypertension	75
High Cholesterol	63
Stroke	0
Ischemic Heart Disease	27
Depression	35
Chronic Kidney Disease	18
Asthma	14
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	8
Chronic Obstructive Pulmonary Disease	10
Diabetes	52
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Denis John Halmi, MD, FACS treated as a bariatric surgeon in Fredericksburg, VA during 2014 were bypass surgery, minimally invasive procedures, weight management and gastrointestinal procedures.

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

bypass surgery	11
doctor visit	157
gastrointestinal procedures	11
minimally invasive procedures	11
weight management	11

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

**Gender**
Male	20
Female	71

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

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

Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS in 2014

Hypertension	74
High Cholesterol	62
Stroke	0
Ischemic Heart Disease	25
Depression	42
Chronic Kidney Disease	19
Asthma	18
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	13
Chronic Obstructive Pulmonary Disease	15
Diabetes	42
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

doctor visit	109

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

**Gender**
Male	28
Female	118

**Ethnicity**
Non-Hispanic White	102
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

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

Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS in 2015

Hypertension	75
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	26
Depression	33
Chronic Kidney Disease	22
Asthma	25
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	45
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

doctor visit	135

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

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

**Age**
From 65 to 74	47
From 75 to 84	0
85 and over	0
Less than 65	30

Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS in 2016

Hypertension	75
High Cholesterol	60
Stroke	0
Ischemic Heart Disease	26
Depression	34
Chronic Kidney Disease	31
Asthma	40
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	15
Chronic Obstructive Pulmonary Disease	14
Diabetes	41
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

doctor visit	125

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

**Gender**
Male	13
Female	66

**Ethnicity**
Non-Hispanic White	47
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	47
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS in 2017

Hypertension	75
High Cholesterol	63
Stroke	0
Ischemic Heart Disease	20
Depression	42
Chronic Kidney Disease	24
Asthma	18
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	46
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Denis John Halmi, MD, FACS treated as a bariatric surgeon in Fredericksburg, VA during 2018 were implant surgery, minimally invasive procedures and gastrointestinal procedures.

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

doctor visit	166
gastrointestinal procedures	13
implant surgery	14
minimally invasive procedures	13

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

**Gender**
Male	14
Female	78

**Ethnicity**
Non-Hispanic White	58
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	49
From 75 to 84	0
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS in 2018

Hypertension	75
High Cholesterol	59
Stroke	0
Ischemic Heart Disease	22
Depression	48
Chronic Kidney Disease	26
Asthma	22
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	12
Chronic Obstructive Pulmonary Disease	13
Diabetes	42
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Denis John Halmi, MD, FACS treated as a bariatric surgeon in Fredericksburg, VA during 2019 were hospital care and inpatient care.

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

doctor visit	175
hospital care	15
inpatient care	15

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

**Gender**
Male	27
Female	81

**Ethnicity**
Non-Hispanic White	75
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	56
From 75 to 84	0
85 and over	0
Less than 65	41

Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS in 2019

Hypertension	75
High Cholesterol	64
Stroke	0
Ischemic Heart Disease	32
Depression	44
Chronic Kidney Disease	39
Asthma	28
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	24
Chronic Obstructive Pulmonary Disease	19
Diabetes	45
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Denis John Halmi, MD, FACS treated as a bariatric surgeon in Fredericksburg, VA during 2020 were hospital care and inpatient care.

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

doctor visit	164
hospital care	35
inpatient care	35

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

**Gender**
Male	26
Female	92

**Ethnicity**
Non-Hispanic White	75
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	70
From 75 to 84	0
85 and over	0
Less than 65	33

Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS in 2020

Hypertension	75
High Cholesterol	70
Stroke	0
Ischemic Heart Disease	38
Depression	42
Chronic Kidney Disease	47
Asthma	19
Osteoperosis	10
Atrial Fibrilation	12
Heart Failure	27
Chronic Obstructive Pulmonary Disease	19
Diabetes	49
Dementia	9
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Denis John Halmi, MD, FACS treated as a bariatric surgeon in Fredericksburg, VA during 2021 were hospital care and inpatient care.

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

doctor visit	182
hospital care	40
inpatient care	40

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

**Gender**
Male	28
Female	97

**Ethnicity**
Non-Hispanic White	77
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	68
From 75 to 84	0
85 and over	0
Less than 65	38

Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS in 2021

Hypertension	75
High Cholesterol	70
Stroke	0
Ischemic Heart Disease	33
Depression	46
Chronic Kidney Disease	45
Asthma	19
Osteoperosis	0
Atrial Fibrilation	13
Heart Failure	28
Chronic Obstructive Pulmonary Disease	18
Diabetes	44
Dementia	10
Cancer	0

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Denis John Halmi, MD, FACS treated as a bariatric surgeon in Fredericksburg, VA during 2022 were hospital care and inpatient care.

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

doctor visit	120
hospital care	49
inpatient care	49

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

**Gender**
Male	31
Female	90

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

**Age**
From 65 to 74	58
From 75 to 84	0
85 and over	0
Less than 65	34

Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS in 2022

Hypertension	75
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	27
Depression	40
Chronic Kidney Disease	26
Asthma	29
Osteoperosis	13
Atrial Fibrilation	17
Heart Failure	26
Chronic Obstructive Pulmonary Disease	22
Diabetes	46
Dementia	0
Cancer	17

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Denis John Halmi, MD, FACS for Medicare patients.

The highest averages for the top procedures that Dr. Denis John Halmi, MD, FACS treated as a bariatric surgeon in Fredericksburg, VA were hospital care, inpatient care, implant surgery and minimally invasive procedures.

bypass surgery	11
doctor visit	156
gastrointestinal procedures	12
hospital care	34
implant surgery	14
inpatient care	34
minimally invasive procedures	12
weight management	11

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Denis John Halmi, MD, FACS.

**Gender**
Male	19
Female	72

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	66
Native American / Alaskan Native	0
Hispanic	0
Other	0

**Age**
75 to 84	0
85 and over	0
Less than 65	16
65 to 74	55

Average of Total of Conditions of Medicare patients treated by Dr. Denis John Halmi, MD, FACS From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Denis John Halmi, MD, FACS treated were hypertension, high cholesterol, diabetes and depression.

Hypertension	68
High Cholesterol	58
Stroke	0
Ischemic Heart Disease	25
Depression	36
Chronic Kidney Disease	27
Asthma	21
Osteoporosis	2
Heart Failure	13
Chronic Obstructive Pulmonary Disease	11
Diabetes	41
Atrial Fibrillation	3
Dementia	1
Cancer	1

Education & Training

Dr. Denis John Halmi, MD, FACS graduated from Semmelweis University Faculty of Medicine in 1979. He completed residency at Caledonian Hospital, Brooklyn. He is certified by the American Board of Surgery - Surgery (General Surgery) and has a state license in Virginia.

Medical School: Semmelweis University Faculty of Medicine (1979)

Residency: Caledonian Hospital, Brooklyn (1987)

Board Certification: American Board of Surgery - Surgery (General Surgery) (2026)

Licensed In: Virginia

Affiliations & Hospitals

Dr. Denis John Halmi, MD, FACS is associated with these hospitals and organizations:

Mary Washington Healthcare

StoneSprings Hospital Center

HCA Virginia

Sentara Health

Mary Washington Weight Loss Center

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General Payments

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

**Payments by Company**
Intuitive Surgical, Inc.	$7,340 Da Vinci Surgical System $7,340
Baxter Healthcare	$4,631 PERI-STRIPS DRY $4,361	BioSurgery - PERI-STRIPS $145	BioSurgery - TISSEEL $126
W. L. Gore & Associates, Inc.	$2,629 SEAMGUARD Bioabsorbable Staple $1,109	SEAMGUARD Bioabsorbable Staple Line Reinforcement $984	SYNECOR Biomaterial $309	BIO-A Tissue Reinforcement $207	SEAMGUARD Staple Line Reinforcement $11	Other $9
Ethicon US, LLC	$1,930 ECHELON ENDOPATH Stapler $313	HARMONIC Product Family $296	Endoscopy Endocutters $274	Endoscopy: Trocars $175	Energy Harmonic $128	Other $744
Medical Device Business Services, Inc.	$1,214 ECHELON FLEX Stapler $1,214
Other	$1,740 Wegovy $313	Saxenda $276	Contrave $243	Endoscopy# Endocutters $175	NASCOBAL CYANOCOBALAMIN, USP $91	Other $641

**Types of Payments**
Food and Beverage	$7,225
Travel and Lodging	$4,729
Education	$4,240
Consulting Fee	$3,290

Biography

Dr. Denis Halmi is a specialist in general surgery and bariatric surgery. These areas are among his clinical interests: obesity, gastric bypass surgery, and metabolism. Dr. Halmi's hospital/clinic affiliations include StoneSprings Hospital Center, Mary Washington Healthcare, and Sentara Health. According to Mary Washington Healthcare, he is currently accepting new patients at his office in Fredericksburg, VA. After attending Semmelweis University Faculty of Medicine for medical school, he completed his residency training at Caledonian Hospital, Brooklyn. He speaks Hungarian.