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Dr. Marylyn Virginia Grondin, MD

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Specializes in: Adult Gastroenterology

330 Borthwick Avenue Suite 311
Portsmouth, NH 03801

(603) 433-2488

Dr. Marylyn Virginia Grondin, MD is a gastroenterologist in Portsmouth, NH specializing in adult gastroenterology.

Office Locations

330 Borthwick Avenue Suite 311
Portsmouth, NH 03801

(603) 433-2488

(603) 433-4649

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55 High Street #202
Hampton, NH 03842

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Noteworthy Medicare Patient Procedures Performed by Dr. Marylyn Virginia Grondin, MD in 2024

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

Top 10%

By Volume:

preventive care

screening colonoscopy

In 2024, Dr. Marylyn Virginia Grondin, MD performed more preventive care, and screening colonoscopy procedures for Medicare patients than 90% of providers in related specialties within New Hampshire.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2012 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

balloon dilation	13
diagnostic procedures	170
doctor visit	386
esophageal dilation	13
gastrointestinal procedures	300
minimally invasive procedures	300
preventive care	117
removal of lesion (e.g. growth)	170

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2013 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

balloon dilation	18
diagnostic procedures	178
doctor visit	492
esophageal dilation	18
gastrointestinal procedures	365
minimally invasive procedures	365
preventive care	169
removal of lesion (e.g. growth)	178

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	77
Female	392

**Age**
From 65 to 74	276
From 75 to 84	112
85 and over	22
Less than 65	59

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2013

Hypertension	48
High Cholesterol	46
Stroke	3
Ischemic Heart Disease	19
Depression	22
Chronic Kidney Disease	12
Asthma	6
Osteoperosis	10
Atrial Fibrilation	7
Heart Failure	7
Chronic Obstructive Pulmonary Disease	8
Diabetes	19
Dementia	5
Cancer	9

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2014 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

balloon dilation	14
diagnostic procedures	194
doctor visit	525
esophageal dilation	14
gastrointestinal procedures	376
minimally invasive procedures	376
preventive care	168
removal of lesion (e.g. growth)	194

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	83
Female	406

**Ethnicity**
Non-Hispanic White	474
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	295
From 75 to 84	110
85 and over	30
Less than 65	54

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2014

Hypertension	55
High Cholesterol	51
Stroke	3
Ischemic Heart Disease	21
Depression	25
Chronic Kidney Disease	10
Asthma	7
Osteoperosis	9
Atrial Fibrilation	7
Heart Failure	9
Chronic Obstructive Pulmonary Disease	10
Diabetes	21
Dementia	3
Cancer	9

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2015 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

balloon dilation	13
diagnostic procedures	191
doctor visit	521
esophageal dilation	13
gastrointestinal procedures	360
minimally invasive procedures	360
preventive care	156
removal of lesion (e.g. growth)	191

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	162
Female	798

**Ethnicity**
Non-Hispanic White	926
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	590
From 75 to 84	220
85 and over	52
Less than 65	98

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2015

Hypertension	53
High Cholesterol	49
Stroke	3
Ischemic Heart Disease	16
Depression	23
Chronic Kidney Disease	10
Asthma	10
Osteoperosis	10
Atrial Fibrilation	7
Heart Failure	6
Chronic Obstructive Pulmonary Disease	9
Diabetes	20
Dementia	6
Cancer	8

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2016 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and preventive care.

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

balloon dilation	12
diagnostic procedures	176
doctor visit	584
esophageal dilation	12
gastrointestinal procedures	364
minimally invasive procedures	364
preventive care	176
removal of lesion (e.g. growth)	176

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	95
Female	454

**Ethnicity**
Non-Hispanic White	517
Black	0
Hispanic	0
Asian	0
Other	18
Native American	0

**Age**
From 65 to 74	320
From 75 to 84	139
85 and over	25
Less than 65	65

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2016

Hypertension	54
High Cholesterol	48
Stroke	3
Ischemic Heart Disease	21
Depression	27
Chronic Kidney Disease	15
Asthma	15
Osteoperosis	7
Atrial Fibrilation	10
Heart Failure	8
Chronic Obstructive Pulmonary Disease	9
Diabetes	19
Dementia	5
Cancer	9

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2017 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

balloon dilation	16
diagnostic procedures	160
doctor visit	511
esophageal dilation	16
gastrointestinal procedures	330
minimally invasive procedures	330
preventive care	154
removal of lesion (e.g. growth)	160

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	93
Female	409

**Ethnicity**
Non-Hispanic White	473
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	309
From 75 to 84	113
85 and over	24
Less than 65	56

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2017

Hypertension	51
High Cholesterol	39
Stroke	0
Ischemic Heart Disease	21
Depression	23
Chronic Kidney Disease	18
Asthma	8
Osteoperosis	9
Atrial Fibrilation	9
Heart Failure	9
Chronic Obstructive Pulmonary Disease	10
Diabetes	20
Dementia	4
Cancer	8

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2018 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

diagnostic procedures	195
doctor visit	445
gastrointestinal procedures	374
minimally invasive procedures	374
preventive care	179
removal of lesion (e.g. growth)	195

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	105
Female	426

**Ethnicity**
Non-Hispanic White	508
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	315
From 75 to 84	137
85 and over	31
Less than 65	48

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2018

Hypertension	55
High Cholesterol	53
Stroke	3
Ischemic Heart Disease	19
Depression	26
Chronic Kidney Disease	14
Asthma	7
Osteoperosis	10
Atrial Fibrilation	8
Heart Failure	8
Chronic Obstructive Pulmonary Disease	8
Diabetes	19
Dementia	5
Cancer	8

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2019 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

balloon dilation	20
diagnostic procedures	190
doctor visit	461
esophageal dilation	20
gastrointestinal procedures	390
minimally invasive procedures	406
preventive care	180
removal of lesion (e.g. growth)	190

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	106
Female	445

**Ethnicity**
Non-Hispanic White	523
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	326
From 75 to 84	139
85 and over	32
Less than 65	54

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2019

Hypertension	56
High Cholesterol	56
Stroke	2
Ischemic Heart Disease	21
Depression	29
Chronic Kidney Disease	17
Asthma	6
Osteoperosis	11
Atrial Fibrilation	8
Heart Failure	9
Chronic Obstructive Pulmonary Disease	8
Diabetes	21
Dementia	5
Cancer	9

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2020 were minimally invasive procedures, gastrointestinal procedures, preventive care and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

biological response modifier (BRM) therapy	22
chemotherapy	22
diagnostic procedures	91
doctor visit	191
gastrointestinal procedures	200
minimally invasive procedures	222
preventive care	109
removal of lesion (e.g. growth)	91

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	76
Female	297

**Ethnicity**
Non-Hispanic White	346
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	208
From 75 to 84	104
85 and over	22
Less than 65	39

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2020

Hypertension	50
High Cholesterol	53
Stroke	3
Ischemic Heart Disease	20
Depression	29
Chronic Kidney Disease	16
Asthma	9
Osteoperosis	12
Atrial Fibrilation	8
Heart Failure	9
Chronic Obstructive Pulmonary Disease	7
Diabetes	18
Dementia	6
Cancer	9

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2021 were minimally invasive procedures, gastrointestinal procedures, preventive care and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

diagnostic procedures	114
doctor visit	160
gastrointestinal procedures	258
liver imaging	15
minimally invasive procedures	258
preventive care	144
removal of lesion (e.g. growth)	114
ultrasound (sonogram)	15

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	68
Female	310

**Ethnicity**
Non-Hispanic White	360
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	237
From 75 to 84	102
85 and over	16
Less than 65	23

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2021

Hypertension	51
High Cholesterol	55
Stroke	0
Ischemic Heart Disease	17
Depression	21
Chronic Kidney Disease	16
Asthma	7
Osteoperosis	12
Atrial Fibrilation	6
Heart Failure	6
Chronic Obstructive Pulmonary Disease	6
Diabetes	15
Dementia	3
Cancer	7

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2022 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

balloon dilation	22
diagnostic procedures	150
doctor visit	338
esophageal dilation	22
gastrointestinal procedures	305
liver imaging	14
minimally invasive procedures	305
preventive care	133
removal of lesion (e.g. growth)	150
ultrasound (sonogram)	14

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	88
Female	351

**Ethnicity**
Non-Hispanic White	411
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	253
From 75 to 84	141
85 and over	15
Less than 65	30

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2022

Hypertension	61
High Cholesterol	70
Stroke	5
Ischemic Heart Disease	15
Depression	21
Chronic Kidney Disease	8
Asthma	12
Osteoperosis	20
Atrial Fibrilation	10
Heart Failure	7
Chronic Obstructive Pulmonary Disease	12
Diabetes	16
Dementia	0
Cancer	15

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2023 were minimally invasive procedures, gastrointestinal procedures, preventive care and removal of lesion (e.g. growth).

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

balloon dilation	14
diagnostic procedures	138
doctor visit	283
esophageal dilation	14
gastrointestinal procedures	300
liver imaging	16
minimally invasive procedures	300
preventive care	148
removal of lesion (e.g. growth)	138
ultrasound (sonogram)	16

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	84
Female	371

**Ethnicity**
Non-Hispanic White	416
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	253
From 75 to 84	158
85 and over	17
Less than 65	27

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2023

Hypertension	58
High Cholesterol	68
Stroke	4
Ischemic Heart Disease	15
Depression	15
Chronic Kidney Disease	9
Asthma	11
Osteoperosis	22
Atrial Fibrilation	11
Heart Failure	4
Chronic Obstructive Pulmonary Disease	11
Diabetes	14
Dementia	3
Cancer	14

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH during 2024 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

balloon dilation	23
diagnostic procedures	170
doctor visit	303
esophageal dilation	23
gastrointestinal procedures	340
minimally invasive procedures	340
preventive care	147
removal of lesion (e.g. growth)	170

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Male	101
Female	393

**Ethnicity**
Non-Hispanic White	458
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	281
From 75 to 84	168
85 and over	21
Less than 65	24

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2024

Hypertension	57
High Cholesterol	73
Stroke	5
Ischemic Heart Disease	13
Depression	20
Chronic Kidney Disease	10
Asthma	11
Osteoperosis	24
Atrial Fibrilation	9
Heart Failure	6
Chronic Obstructive Pulmonary Disease	10
Diabetes	15
Dementia	0
Cancer	13

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Marylyn Virginia Grondin, MD for Medicare patients.

The highest averages for the top procedures that Dr. Marylyn Virginia Grondin, MD treated as a gastroenterologist in Portsmouth, NH were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

balloon dilation	16
biological response modifier (BRM) therapy	22
chemotherapy	22
diagnostic procedures	162
doctor visit	400
esophageal dilation	16
gastrointestinal procedures	327
liver imaging	15
minimally invasive procedures	330
preventive care	152
removal of lesion (e.g. growth)	162
ultrasound (sonogram)	15

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Marylyn Virginia Grondin, MD.

**Gender**
Female	388
Male	87

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	416
Native American / Alaskan Native	0
Hispanic	0
Other	1

**Age**
85 and over	23
75 to 84	126
Less than 65	44
65 to 74	281

Average of Total of Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD From 2012 - 2024

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

Hypertension	49
High Cholesterol	50
Stroke	2
Ischemic Heart Disease	16
Depression	21
Chronic Kidney Disease	11
Asthma	8
Osteoporosis	12
Heart Failure	6
Chronic Obstructive Pulmonary Disease	8
Diabetes	16
Atrial Fibrillation	7
Cancer	9
Dementia	3

Education & Training

She has a state license in New Hampshire.

Licensed In: New Hampshire

Ratings & Reviews

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General Payments

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

**Payments by Company**
Allergan Inc.	$11,344 VIBERZI $10,919	LINZESS $252	ZENPEP $112	VRAYLAR $61
FOREST PHARMACEUTICALS, INC.	$6,299 LINZESS $6,299
Actavis Pharma Inc	$2,178 LINZESS $2,164	DELZICOL $14
AbbVie, Inc.	$1,573 Humira $733	Mavyret $284	Viekira $132	Creon $130	Lupron $84	Other $210
Janssen Biotech, Inc.	$1,005 STELARA $416	SIMPONI $356	REMICADE $221	OLYSIO $11
Other	$7,466 XIFAXAN $572	Cook Medical Hemostasis $435	Cook Medical Biliary $295	Cook Medical Metal Stents $292	DUPIXENT $264	Other $5,609

**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	$17,200
Food and Beverage	$11,405
Travel and Lodging	$963
Education	$296

Biography

Dr. Marylyn Grondin is an adult gastroenterology specialist in Portsmouth, NH. Dr. Grondin has obtained a license to practice in New Hampshire.

Select Year:

Dr. Marylyn Virginia Grondin, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. Marylyn Virginia Grondin, MD in 2024

By Volume:

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

2013 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2022

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

2023 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2023

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

2024 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD in 2024

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Average Medicare Patient Data From 2012 - 2024

Average of Total of Conditions of Medicare patients treated by Dr. Marylyn Virginia Grondin, MD From 2012 - 2024

Education & Training

Ratings & Reviews

General Payments

Biography

Other Providers in Portsmouth, NH