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Dr. Marvin Ryou, MD

(Dr. Marvin Ryou, M.D.)

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Specializes in: Adult Gastroenterology

Harvard Medical School

Professional interests include: ERCP (biliary and pancreatic endoscopy), gastrointestinal problems (digestive disorders), endoscopic mucosal resection (EMR), and more.

133 Old Road To Nine Acre Corner
Concord, MA 01742

(978) 369-1400

Dr. Marvin Ryou, MD is a gastroenterologist in Concord, MA specializing in adult gastroenterology. He graduated from Harvard Medical School. Dr. Marvin Ryou, MD is affiliated with Dana-Farber Cancer Institute and Emerson Health.

Office Locations

Emerson Health

133 Old Road To Nine Acre Corner
Concord, MA 01742

(978) 369-1400

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450 Brookline Avenue
Boston, MA 02215

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75 Francis Street
Boston, MA 02115

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Some issues Dr. Marvin Ryou, MD can help you with:

Gastrointestinal Problems (Digestive Disorders)

The gastrointestinal system, or GI tract, is the name given to a collection of organs that work together to digest food. These organs fit together in a long tube, running from the mouth to the anus, and include the esophagus, stomach, and intestines, among others. With so many parts working together, complicated by today's busy lifestyles and diets, digestive problems are common. As many as 1 in 3 Americans have a digestive or GI disorder. There are a huge variety of digestive problems, but the most common are IBS, constipation, GERD, hemorrhoids, and ulcers.

IBS, or irritable bowel syndrome, happens when the muscles surrounding the colon contract too easily or frequently. The result is abdominal pain, cramps, diarrhea or constipation, gas and bloating. IBS attacks can often be brought on by specific triggers, so a key part of treatment is learning which foods trigger IBS attacks and avoiding them. Treatment also includes exercise, avoiding stress, and medications if needed.

Constipation, or large, hard, or infrequent stools, happens to everyone at some point. It can be caused by a disruption in routine or food, or by eating a diet without many fresh fruits and vegetables. Although it is uncomfortable, constipation is common and usually not serious, but it can sometimes become chronic. Adding fiber to the diet, exercising, and taking medications may help.

GERD, or gastroesophageal reflux disease, is a severe form of chronic heartburn where stomach acid spills back up into the esophagus. Left untreated, the acid may even eat away at the esophagus and cause serious damage. Treatment includes changing the diet to avoid trigger foods, losing weight if needed, medications, or even surgery.

Hemorrhoids are blood vessels around the rectum that become irritated, swollen or torn while straining during a bowel movement. They are most often caused by constipation, but can also be caused by pregnancy, diarrhea, or simply a genetic predisposition towards hemorrhoids. Treatment involves first treating any constipation issues, then keeping the area clean and soothed until it has healed. If these measures are ineffective, surgery is sometimes used.

Peptic ulcers are sores or spots of inflammation in the lining of the stomach or close to the stomach in the small intestine. Usually this area is coated with a protective lining that shields the tissue from the strong stomach acid, but a break in the lining can let acid in, causing the sores. It used to be thought that stress caused ulcers, but now it is known that is not the case. Most often, they are caused by an infection by H. pylori bacteria, but ulcers can also be caused by alcohol abuse or overuse of aspirin, ibuprofen, naproxen, or other NSAIDS. The symptoms of an ulcer are pain, hunger, nausea, and fatigue.

Gastrointestinal problems, perhaps more than any other area, are markedly affected by lifestyle. Many disorders can be prevented or treated at least in part by eating a healthy diet high in fiber, exercising regularly, drinking enough water, and limiting alcohol intake. Still, the frequency of digestive disorders means that even the healthiest person can be affected by them. Anyone who notices blood in their stool, experiences abdominal pain, unexplained weight loss, or any significant change in bowel movements should see a doctor.

Noteworthy Medicare Patient Procedures Performed by Dr. Marvin Ryou, MD in 2023

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

Top 25%

By Volume:

EGD with endoscopic ultrasound

endoscopic ultrasound

endoscopic ultrasound with fine needle aspiration

In 2012, Dr. Marvin Ryou, MD performed more EGD with endoscopic ultrasound, endoscopic ultrasound (EUS), and endoscopic ultrasound with fine needle aspiration procedures for Medicare patients than 75% of providers in related specialties within Massachusetts.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2012 were gastrointestinal procedures, minimally invasive procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	44
diagnostic procedures	216
doctor visit	137
foreign body removal	16
gastrointestinal procedures	410
hospital care	90
image guided procedures	44
injections	15
inpatient care	90
minimally invasive procedures	410
minor procedures	44
preventive care	55
removal of lesion (e.g. growth)	216
stent placement (stenting)	23
ultrasound (sonogram)	74

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2013 were gastrointestinal procedures, minimally invasive procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	53
balloon dilation	16
diagnostic procedures	261
doctor visit	232
esophageal dilation	16
gastrointestinal procedures	497
hospital care	61
image guided procedures	53
injections	19
inpatient care	61
minimally invasive procedures	497
minor procedures	53
preventive care	66
removal of lesion (e.g. growth)	261
stent placement (stenting)	18
ultrasound (sonogram)	98

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	226
Female	317

**Ethnicity**
Non-Hispanic White	394
Black	59
Hispanic	66
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	222
From 75 to 84	135
85 and over	44
Less than 65	142

Conditions of Medicare patients treated by Dr. Marvin Ryou, MD in 2013

Hypertension	69
High Cholesterol	52
Stroke	4
Ischemic Heart Disease	36
Depression	37
Chronic Kidney Disease	31
Asthma	14
Osteoperosis	10
Atrial Fibrilation	12
Heart Failure	22
Chronic Obstructive Pulmonary Disease	15
Diabetes	35
Dementia	6
Cancer	21

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2014 were gastrointestinal procedures, minimally invasive procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	43
balloon dilation	14
diagnostic procedures	268
doctor visit	170
esophageal dilation	14
gastrointestinal procedures	499
hospital care	62
image guided procedures	43
injections	20
inpatient care	62
minimally invasive procedures	499
minor procedures	43
preventive care	48
removal of lesion (e.g. growth)	268
stent placement (stenting)	24
ultrasound (sonogram)	80

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	212
Female	260

**Ethnicity**
Non-Hispanic White	350
Black	50
Hispanic	48
Asian	12
Other	0
Native American	0

**Age**
From 65 to 74	203
From 75 to 84	123
85 and over	42
Less than 65	104

Conditions of Medicare patients treated by Dr. Marvin Ryou, MD in 2014

Hypertension	67
High Cholesterol	46
Stroke	6
Ischemic Heart Disease	37
Depression	31
Chronic Kidney Disease	33
Asthma	13
Osteoperosis	12
Atrial Fibrilation	13
Heart Failure	22
Chronic Obstructive Pulmonary Disease	12
Diabetes	28
Dementia	6
Cancer	19

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2015 were gastrointestinal procedures, minimally invasive procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	37
diagnostic procedures	202
doctor visit	105
gastrointestinal procedures	405
hospital care	39
image guided procedures	37
injections	17
inpatient care	39
minimally invasive procedures	405
minor procedures	37
preventive care	34
removal of lesion (e.g. growth)	202
stent placement (stenting)	31
ultrasound (sonogram)	84

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	374
Female	384

**Ethnicity**
Non-Hispanic White	596
Black	68
Hispanic	58
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	364
From 75 to 84	174
85 and over	72
Less than 65	148

Conditions of Medicare patients treated by Dr. Marvin Ryou, MD in 2015

Hypertension	69
High Cholesterol	50
Stroke	4
Ischemic Heart Disease	42
Depression	35
Chronic Kidney Disease	34
Asthma	15
Osteoperosis	9
Atrial Fibrilation	16
Heart Failure	22
Chronic Obstructive Pulmonary Disease	18
Diabetes	30
Dementia	7
Cancer	23

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2016 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	43
diagnostic procedures	209
doctor visit	113
gastrointestinal procedures	423
image guided procedures	43
minimally invasive procedures	423
minor procedures	43
preventive care	19
removal of lesion (e.g. growth)	221
stent placement (stenting)	25
ultrasound (sonogram)	88

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	181
Female	211

**Ethnicity**
Non-Hispanic White	313
Black	32
Hispanic	30
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	186
From 75 to 84	99
85 and over	30
Less than 65	77

Conditions of Medicare patients treated by Dr. Marvin Ryou, MD in 2016

Hypertension	68
High Cholesterol	53
Stroke	5
Ischemic Heart Disease	45
Depression	34
Chronic Kidney Disease	40
Asthma	24
Osteoperosis	12
Atrial Fibrilation	16
Heart Failure	23
Chronic Obstructive Pulmonary Disease	18
Diabetes	33
Dementia	10
Cancer	23

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2017 were gastrointestinal procedures, minimally invasive procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	51
diagnostic procedures	265
doctor visit	115
gastrointestinal procedures	511
hospital care	66
image guided procedures	51
injections	17
inpatient care	66
minimally invasive procedures	511
minor procedures	51
preventive care	37
removal of lesion (e.g. growth)	265
stent placement (stenting)	27
ultrasound (sonogram)	121

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	226
Female	269

**Ethnicity**
Non-Hispanic White	391
Black	38
Hispanic	37
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	225
From 75 to 84	133
85 and over	34
Less than 65	103

Conditions of Medicare patients treated by Dr. Marvin Ryou, MD in 2017

Hypertension	65
High Cholesterol	42
Stroke	5
Ischemic Heart Disease	46
Depression	30
Chronic Kidney Disease	41
Asthma	13
Osteoperosis	12
Atrial Fibrilation	18
Heart Failure	22
Chronic Obstructive Pulmonary Disease	12
Diabetes	30
Dementia	14
Cancer	20

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2018 were gastrointestinal procedures, minimally invasive procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	55
diagnostic procedures	189
doctor visit	111
foreign body removal	34
gastrointestinal procedures	444
hospital care	44
image guided procedures	55
inpatient care	44
minimally invasive procedures	444
minor procedures	55
preventive care	30
removal of lesion (e.g. growth)	189
stent placement (stenting)	40
ultrasound (sonogram)	118

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	198
Female	219

**Ethnicity**
Non-Hispanic White	333
Black	26
Hispanic	33
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	186
From 75 to 84	125
85 and over	34
Less than 65	72

Conditions of Medicare patients treated by Dr. Marvin Ryou, MD in 2018

Hypertension	68
High Cholesterol	57
Stroke	4
Ischemic Heart Disease	50
Depression	34
Chronic Kidney Disease	38
Asthma	9
Osteoperosis	12
Atrial Fibrilation	15
Heart Failure	21
Chronic Obstructive Pulmonary Disease	15
Diabetes	29
Dementia	14
Cancer	26

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2019 were gastrointestinal procedures, minimally invasive procedures, diagnostic procedures and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	47
balloon dilation	17
diagnostic procedures	206
doctor visit	125
esophageal dilation	17
foreign body removal	16
gastrointestinal procedures	441
image guided procedures	47
injections	13
minimally invasive procedures	441
minor procedures	47
preventive care	16
removal of lesion (e.g. growth)	206
stent placement (stenting)	29
ultrasound (sonogram)	121

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	183
Female	224

**Ethnicity**
Non-Hispanic White	327
Black	27
Hispanic	27
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	195
From 75 to 84	126
85 and over	33
Less than 65	53

Conditions of Medicare patients treated by Dr. Marvin Ryou, MD in 2019

Hypertension	67
High Cholesterol	57
Stroke	5
Ischemic Heart Disease	44
Depression	33
Chronic Kidney Disease	39
Asthma	9
Osteoperosis	17
Atrial Fibrilation	16
Heart Failure	20
Chronic Obstructive Pulmonary Disease	13
Diabetes	27
Dementia	12
Cancer	24

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2020 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	55
balloon dilation	15
diagnostic procedures	174
doctor visit	57
esophageal dilation	15
foreign body removal	36
gastrointestinal procedures	437
image guided procedures	55
minimally invasive procedures	437
minor procedures	55
removal of lesion (e.g. growth)	174
stent placement (stenting)	51
ultrasound (sonogram)	131

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	180
Female	208

**Ethnicity**
Non-Hispanic White	303
Black	0
Hispanic	26
Asian	0
Other	26
Native American	0

**Age**
From 65 to 74	186
From 75 to 84	123
85 and over	32
Less than 65	47

Conditions of Medicare patients treated by Dr. Marvin Ryou, MD in 2020

Hypertension	70
High Cholesterol	57
Stroke	6
Ischemic Heart Disease	50
Depression	31
Chronic Kidney Disease	40
Asthma	9
Osteoperosis	15
Atrial Fibrilation	18
Heart Failure	23
Chronic Obstructive Pulmonary Disease	14
Diabetes	30
Dementia	13
Cancer	24

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2021 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	56
diagnostic procedures	176
doctor visit	59
gastrointestinal procedures	395
image guided procedures	56
minimally invasive procedures	395
minor procedures	56
preventive care	14
removal of lesion (e.g. growth)	176
stent placement (stenting)	35
ultrasound (sonogram)	160

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	160
Female	223

**Ethnicity**
Non-Hispanic White	312
Black	22
Hispanic	21
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	168
From 75 to 84	121
85 and over	26
Less than 65	68

Conditions of Medicare patients treated by Dr. Marvin Ryou, MD in 2021

Hypertension	68
High Cholesterol	59
Stroke	7
Ischemic Heart Disease	41
Depression	34
Chronic Kidney Disease	39
Asthma	11
Osteoperosis	14
Atrial Fibrilation	15
Heart Failure	22
Chronic Obstructive Pulmonary Disease	13
Diabetes	34
Dementia	13
Cancer	19

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA during 2022 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

aspiration	42
balloon dilation	20
diagnostic procedures	147
doctor visit	44
esophageal dilation	20
gastrointestinal procedures	355
image guided procedures	42
minimally invasive procedures	355
minor procedures	42
removal of lesion (e.g. growth)	147
stent placement (stenting)	27
ultrasound (sonogram)	110

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	135
Female	186

**Ethnicity**
Non-Hispanic White	269
Black	15
Hispanic	16
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	145
From 75 to 84	105
85 and over	29
Less than 65	42

Conditions of Medicare patients treated by Dr. Marvin Ryou, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	12
Ischemic Heart Disease	34
Depression	35
Chronic Kidney Disease	31
Asthma	18
Osteoperosis	20
Atrial Fibrilation	26
Heart Failure	18
Chronic Obstructive Pulmonary Disease	16
Diabetes	32
Dementia	10
Cancer	28

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Marvin Ryou, MD for Medicare patients.

The highest averages for the top procedures that Dr. Marvin Ryou, MD treated as a gastroenterologist in Concord, MA were gastrointestinal procedures, minimally invasive procedures, removal of lesion (e.g. growth) and diagnostic procedures.

aspiration	47
balloon dilation	16
diagnostic procedures	210
doctor visit	115
esophageal dilation	16
foreign body removal	25
gastrointestinal procedures	437
hospital care	60
image guided procedures	47
injections	16
inpatient care	60
minimally invasive procedures	437
minor procedures	47
preventive care	35
removal of lesion (e.g. growth)	211
stent placement (stenting)	30
ultrasound (sonogram)	107

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Marvin Ryou, MD.

**Gender**
Male	188
Female	227

**Ethnicity**
Black / African American	30
Asian / Pacific Islander	1
Non-Hispanic White	326
Native American / Alaskan Native	0
Hispanic	32
Other	2

**Age**
75 to 84	114
85 and over	34
Less than 65	77
65 to 74	189

Average of Total of Conditions of Medicare patients treated by Dr. Marvin Ryou, MD From 2012 - 2022

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

Hypertension	62
High Cholesterol	49
Stroke	5
Ischemic Heart Disease	38
Depression	30
Chronic Kidney Disease	33
Asthma	12
Osteoporosis	12
Heart Failure	19
Chronic Obstructive Pulmonary Disease	13
Diabetes	28
Atrial Fibrillation	15
Cancer	20
Dementia	9

Education & Training

Dr. Marvin Ryou, MD graduated from Harvard Medical School. He completed residency at Brigham and Women's Hospital. He is certified by the Gastroenterology Internal Medicine and has a state license in Massachusetts.

Medical School: Harvard Medical School

Residency: Brigham and Women's Hospital

Board Certification: Gastroenterology Internal Medicine

Licensed In: Massachusetts

Affiliations & Hospitals

Dr. Marvin Ryou, MD is associated with these hospitals and organizations:

Dana-Farber Cancer Institute

Emerson Health

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General Payments

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

**Payments by Company**
Covidien LP	$52,862 GI Solutions $24,202	Beacon $15,498	Small Bowel $8,240	Cytosponge $3,830	PillCam $205	Other $888
Boston Scientific Corporation	$41,669 GENERAL THERAPIES $26,907	RESOLUTION CLIP $8,712	GENERAL - HEMOSTASIS $3,614	SPYGLASS $1,017	GENERAL BILIARY DEVICES $205	Other $1,213
Olympus America Inc.	$18,468 EVIS EXERA II ULTRASOUND GASTROVIDEOSCOPE $7,688	EVIS EUS ENDOSCOPIC ULTRASOUND CENTER $5,535	Ultrasound Processors $5,246
FUJIFILM Healthcare Americas Corporation	$12,230 FUJIFILM $8,067	$4,162
PENTAX of America, Inc.	$8,647 Aloka Arietta 850 $737	$7,910
Other	$20,138 ESD - Core Endoscopy $5,994	GI Solutions $2,952	ESD - EUS $2,250	EchoTip $1,834	Cook Medical Hemostasis $895	Other $6,213

**Types of Payments**
Consulting Fee	$75,747
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$52,092
Travel and Lodging	$18,730
Food and Beverage	$7,178
Entertainment	$216
Other	$50

Research Payments

Dr. Marvin Ryou, MD has received 28 research payments totaling $193,414.

Biography

Dr. Marvin Ryou is an adult gastroenterology specialist in Boston, MA and Concord, MA. He is a graduate of Harvard Medical School. His residency was performed at Brigham and Women's Hospital. Dr. Ryou's areas of expertise consist of endoscopic mucosal resection (EMR), gastrointestinal problems (digestive disorders), and hepatobiliary disorders. He is affiliated with Emerson Health and Dana-Farber Cancer Institute.