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Dr. Gerard A. Dillon, MD

(Gerard A. Dillon, MD)

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Specializes in: Cardiology (Heart Disease)

SUNY - The State University of New York at Buffalo (1992)

Professional interests include: cardiac risk reduction, hypertension (high blood pressure), arrhythmias (irregular heartbeats), and more.

253 Pleasant Street
Concord, NH 03301

(603) 229-5355

Dr. Gerard A. Dillon, MD is a cardiologist in Concord, NH specializing in cardiology (heart disease). He graduated from SUNY - The State University of New York at Buffalo in 1992 and has 34 years of experience. Dr. Gerard A. Dillon, MD is affiliated with Dartmouth-Hitchcock Concord and Dartmouth Health.

Office Locations

253 Pleasant Street
Concord, NH 03301

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Some issues Dr. Gerard A. Dillon, MD can help you with:

Coronary Artery Disease

Coronary artery disease (CAD) is the most common type of heart disease. It happens when the blood vessels carrying blood to the heart, called coronary arteries, narrow and harden. This occurs when cholesterol, a type of fat found in the blood, builds up to form plaque, which sticks to the inner walls of the arteries. As plaque accumulates, less blood can flow through the arteries, which may lead to the following:

Angina, which is chest pain that occurs when the heart does not receive enough blood flow.
Heart attack, which happens if the arteries leading to the heart are completely blocked.
Arrhythmia, or irregular heartbeat, which can develop if the heart does not have enough blood supply.
Heart failure, which may occur if a heart attack damages the heart and it becomes too weak to pump enough blood to the rest of the body.

Certain factors may increase risk for the disease, like smoking, lack of exercise, being overweight, high cholesterol, high blood pressure, and diabetes. CAD tends to develop over decades, so it can go undetected until it has become quite severe. A diagnosis may be established using such tests as:

Electrocardiogram (ECG), which records the heart's electrical activity over a period of time. ECGs can detect whether there is enough blood flow to the heart or if a heart attack has occurred.
Echocardiogram (echo), which creates images of the heart using sound waves. Echos can show whether the heart is able to pump blood normally.
Stress tests, where an ECG or echo is combined with exercise, like riding a stationary bike or walking on a treadmill. This test is done to find out if the heart can function properly while performing a strenuous activity.

Treatments for the disease include medications such as vasodilators, like nitroglycerin, which dilates (widens) the coronary arteries. CAD may also be treated by a procedure called angioplasty with stent placement, where a balloon is inflated inside a diseased artery to flatten the plaque deposits against the artery walls, creating more room for blood to flow.

In some severe cases of the disease, multiple arteries may be blocked, and an open heart surgery called coronary artery bypass surgery may be necessary. This operation transplants a vessel from another part of the body to form a graft that goes past the narrowed arteries, thus enabling blood to flow around those arteries.

Noteworthy Medicare Patient Procedures Performed by Dr. Gerard A. Dillon, MD in 2023

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

Top 5%

By Volume:

Holter monitoring

In 2023, Dr. Gerard A. Dillon, MD performed more Holter monitoring procedures for Medicare patients than 95% of providers in related specialties within New Hampshire.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2012 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

cardiac procedures	336
catheterization	127
diagnostic procedures	90
doctor visit	326
hospital care	135
inpatient care	135
minimally invasive procedures	127
nuclear scan	41
stent placement (stenting)	37
stress testing	56
ultrasound (sonogram)	155
vascular procedures	103

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2013 were cardiac procedures, minimally invasive procedures, catheterization and vascular procedures.

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

angioplasty	42
cardiac procedures	364
cardioversion	11
catheterization	198
diagnostic procedures	119
doctor visit	300
emergency care	16
hospital care	129
inpatient care	129
minimally invasive procedures	198
nuclear scan	16
stent placement (stenting)	42
stress testing	16
ultrasound (sonogram)	133
vascular procedures	136

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	366
Female	324

**Ethnicity**
Non-Hispanic White	664
Black	0
Hispanic	0
Asian	0
Other	11
Native American	0

**Age**
From 65 to 74	278
From 75 to 84	202
85 and over	126
Less than 65	84

Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD in 2013

Hypertension	75
High Cholesterol	73
Stroke	5
Ischemic Heart Disease	62
Depression	29
Chronic Kidney Disease	30
Asthma	9
Osteoperosis	9
Atrial Fibrilation	28
Heart Failure	35
Chronic Obstructive Pulmonary Disease	24
Diabetes	38
Dementia	10
Cancer	12

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2014 were cardiac procedures, minimally invasive procedures, catheterization and ultrasound (sonogram).

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

angioplasty	56
cardiac procedures	405
catheterization	219
diagnostic procedures	121
doctor visit	224
emergency care	14
hospital care	55
inpatient care	55
minimally invasive procedures	219
nuclear scan	19
stent placement (stenting)	56
stress testing	33
ultrasound (sonogram)	167
vascular procedures	121

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	309
Female	259

**Ethnicity**
Non-Hispanic White	548
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	215
From 75 to 84	206
85 and over	86
Less than 65	61

Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD in 2014

Hypertension	75
High Cholesterol	74
Stroke	6
Ischemic Heart Disease	63
Depression	28
Chronic Kidney Disease	33
Asthma	10
Osteoperosis	9
Atrial Fibrilation	29
Heart Failure	37
Chronic Obstructive Pulmonary Disease	18
Diabetes	38
Dementia	9
Cancer	13

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2015 were cardiac procedures, minimally invasive procedures, catheterization and ultrasound (sonogram).

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

angioplasty	54
cardiac procedures	463
cardioversion	12
catheterization	221
diagnostic procedures	121
doctor visit	188
emergency care	19
hospital care	22
inpatient care	22
minimally invasive procedures	234
nuclear scan	27
stent placement (stenting)	54
stress testing	38
ultrasound (sonogram)	203
vascular procedures	133

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	756
Female	624

**Ethnicity**
Non-Hispanic White	1334
Black	0
Hispanic	0
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	538
From 75 to 84	482
85 and over	198
Less than 65	162

Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD in 2015

Hypertension	75
High Cholesterol	69
Stroke	7
Ischemic Heart Disease	62
Depression	26
Chronic Kidney Disease	32
Asthma	18
Osteoperosis	8
Atrial Fibrilation	26
Heart Failure	33
Chronic Obstructive Pulmonary Disease	22
Diabetes	34
Dementia	9
Cancer	10

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2016 were cardiac procedures, ultrasound (sonogram) and ambulatory monitoring.

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

ambulatory monitoring	46
cardiac procedures	254
doctor visit	380
ultrasound (sonogram)	208

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	170
Female	220

**Age**
From 65 to 74	180
From 75 to 84	122
85 and over	44
Less than 65	44

Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD in 2016

Hypertension	71
High Cholesterol	67
Stroke	4
Ischemic Heart Disease	38
Depression	22
Chronic Kidney Disease	26
Asthma	20
Osteoperosis	10
Atrial Fibrilation	21
Heart Failure	21
Chronic Obstructive Pulmonary Disease	14
Diabetes	29
Dementia	4
Cancer	10

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2017 were cardiac procedures, ultrasound (sonogram), stress testing and ambulatory monitoring.

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

ambulatory monitoring	51
cardiac procedures	361
doctor visit	692
stress testing	69
ultrasound (sonogram)	310

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	342
Female	479

**Ethnicity**
Non-Hispanic White	791
Black	0
Hispanic	0
Asian	0
Other	19
Native American	0

**Age**
From 65 to 74	384
From 75 to 84	259
85 and over	87
Less than 65	91

Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD in 2017

Hypertension	68
High Cholesterol	59
Stroke	6
Ischemic Heart Disease	35
Depression	23
Chronic Kidney Disease	29
Asthma	9
Osteoperosis	8
Atrial Fibrilation	19
Heart Failure	15
Chronic Obstructive Pulmonary Disease	13
Diabetes	28
Dementia	6
Cancer	8

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2018 were cardiac procedures, ultrasound (sonogram), stress testing and ambulatory monitoring.

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

ambulatory monitoring	70
cardiac procedures	392
doctor visit	960
stress testing	73
ultrasound (sonogram)	322

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	459
Female	560

**Ethnicity**
Non-Hispanic White	976
Black	0
Hispanic	0
Asian	0
Other	20
Native American	0

**Age**
From 65 to 74	462
From 75 to 84	328
85 and over	113
Less than 65	116

Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD in 2018

Hypertension	66
High Cholesterol	65
Stroke	7
Ischemic Heart Disease	36
Depression	24
Chronic Kidney Disease	28
Asthma	7
Osteoperosis	7
Atrial Fibrilation	18
Heart Failure	15
Chronic Obstructive Pulmonary Disease	12
Diabetes	27
Dementia	7
Cancer	8

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2019 were cardiac procedures, ultrasound (sonogram), stress testing and ambulatory monitoring.

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

ambulatory monitoring	48
cardiac procedures	380
doctor visit	1004
stress testing	65
ultrasound (sonogram)	332

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	448
Female	532

**Ethnicity**
Non-Hispanic White	930
Black	0
Hispanic	0
Asian	0
Other	25
Native American	0

**Age**
From 65 to 74	453
From 75 to 84	294
85 and over	106
Less than 65	127

Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD in 2019

Hypertension	66
High Cholesterol	60
Stroke	6
Ischemic Heart Disease	36
Depression	21
Chronic Kidney Disease	0
Asthma	7
Osteoperosis	8
Atrial Fibrilation	19
Heart Failure	15
Chronic Obstructive Pulmonary Disease	12
Diabetes	26
Dementia	8
Cancer	8

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2020 were cardiac procedures, ultrasound (sonogram), stress testing and ambulatory monitoring.

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

ambulatory monitoring	42
cardiac procedures	313
doctor visit	875
stress testing	50
ultrasound (sonogram)	271

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	427
Female	470

**Ethnicity**
Non-Hispanic White	858
Black	0
Hispanic	0
Asian	0
Other	22
Native American	0

**Age**
From 65 to 74	408
From 75 to 84	299
85 and over	108
Less than 65	82

Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD in 2020

Hypertension	67
High Cholesterol	58
Stroke	6
Ischemic Heart Disease	42
Depression	21
Chronic Kidney Disease	29
Asthma	5
Osteoperosis	7
Atrial Fibrilation	19
Heart Failure	17
Chronic Obstructive Pulmonary Disease	11
Diabetes	27
Dementia	6
Cancer	8

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2021 were cardiac procedures, ultrasound (sonogram), stress testing and ambulatory monitoring.

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

ambulatory monitoring	41
cardiac procedures	331
doctor visit	1117
stress testing	56
ultrasound (sonogram)	290

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	439
Female	502

**Ethnicity**
Non-Hispanic White	897
Black	0
Hispanic	0
Asian	0
Other	30
Native American	0

**Age**
From 65 to 74	439
From 75 to 84	312
85 and over	97
Less than 65	93

Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD in 2021

Hypertension	68
High Cholesterol	61
Stroke	8
Ischemic Heart Disease	37
Depression	21
Chronic Kidney Disease	25
Asthma	6
Osteoperosis	8
Atrial Fibrilation	20
Heart Failure	15
Chronic Obstructive Pulmonary Disease	11
Diabetes	25
Dementia	6
Cancer	9

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH during 2022 were cardiac procedures, ultrasound (sonogram), stress testing and ambulatory monitoring.

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

ambulatory monitoring	19
cardiac procedures	281
doctor visit	948
stress testing	46
ultrasound (sonogram)	262

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	451
Female	502

**Ethnicity**
Non-Hispanic White	911
Black	0
Hispanic	0
Asian	0
Other	30
Native American	0

**Age**
From 65 to 74	412
From 75 to 84	352
85 and over	102
Less than 65	87

Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD in 2022

Hypertension	74
High Cholesterol	75
Stroke	10
Ischemic Heart Disease	32
Depression	20
Chronic Kidney Disease	20
Asthma	8
Osteoperosis	12
Atrial Fibrilation	29
Heart Failure	17
Chronic Obstructive Pulmonary Disease	14
Diabetes	24
Dementia	5
Cancer	13

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Gerard A. Dillon, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gerard A. Dillon, MD treated as a cardiologist in Concord, NH were cardiac procedures, ultrasound (sonogram), minimally invasive procedures and catheterization.

ambulatory monitoring	45
angioplasty	50
cardiac procedures	352
cardioversion	11
catheterization	191
diagnostic procedures	112
doctor visit	637
emergency care	16
hospital care	85
inpatient care	85
minimally invasive procedures	194
nuclear scan	25
stent placement (stenting)	47
stress testing	50
ultrasound (sonogram)	241
vascular procedures	123

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Gerard A. Dillon, MD.

**Gender**
Male	378
Female	406

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	0
Non-Hispanic White	719
Native American / Alaskan Native	0
Hispanic	0
Other	14

**Age**
75 to 84	259
85 and over	97
Less than 65	86
65 to 74	342

Average of Total of Conditions of Medicare patients treated by Dr. Gerard A. Dillon, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Gerard A. Dillon, MD treated were hypertension, high cholesterol, ischemic heart disease and diabetes.

Hypertension	64
High Cholesterol	60
Stroke	5
Ischemic Heart Disease	40
Depression	21
Chronic Kidney Disease	22
Asthma	9
Osteoporosis	7
Heart Failure	20
Chronic Obstructive Pulmonary Disease	13
Diabetes	26
Atrial Fibrillation	20
Dementia	6
Cancer	9

Education & Training

Dr. Gerard A. Dillon, MD graduated from SUNY - The State University of New York at Buffalo in 1992. He completed residency at Johns Hopkins Hospital. He is certified by the Board certification: Internal Medicine and has a state license in New Hampshire.

Medical School: SUNY - The State University of New York at Buffalo (1992)

Residency: Johns Hopkins Hospital (1995)

Board Certification: Board certification: Internal Medicine

Licensed In: New Hampshire

Affiliations & Hospitals

Dr. Gerard A. Dillon, MD is associated with these hospitals and organizations:

Dartmouth-Hitchcock Concord

Dartmouth Health

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General Payments

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

**Payments by Company**
AstraZeneca Pharmaceuticals LP	$16 BRILINTA $16

**Types of Payments**
Food and Beverage	$16

Biography

Dr. Gerard Dillon is a physician who specializes in cardiology (heart disease). Clinical interests for Dr. Dillon include arrhythmias (irregular heartbeats), cardiac risk reduction, and heart valve disease. Before completing his residency at a hospital affiliated with Johns Hopkins University, Dr. Dillon attended medical school at SUNY, University at Buffalo School of Medicine & Biomedical Sciences. His professional affiliations include Dartmouth-Hitchcock Clinics, Dartmouth-Hitchcock Medical Center (DHMC), and Dartmouth-Hitchcock (D-H) Concord.