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Home > CT Providers > Cardiologists

Dr. Gregory R. D'onofrio, MD

Accepting New Patients

(Gregory R. D'Onofrio)

(5 Ratings)

Specializes in: Cardiology (Heart Disease) and General Practice

George Washington University School of Medicine (1990)

29 HOSPITAL PLAZA SUITE 502
STAMFORD, CT 06902

(203) 348-7410

Dr. Gregory R. D'onofrio, MD is a cardiologist in STAMFORD, CT specializing in cardiology (heart disease) and general practice. He graduated from George Washington University School of Medicine in 1990 and has 36 years of experience. Dr. Gregory R. D'onofrio, MD is affiliated with Stamford Health Medical Group.

Office Locations

29 HOSPITAL PLAZA SUITE 502
STAMFORD, CT 06902

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Noteworthy Medicare Patient Procedures Performed by Dr. Gregory R. D'onofrio, MD in 2023

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

Top 10%

By Affordability:

cardiac imaging

color Doppler echocardiography

Doppler echocardiography

spectral Doppler echocardiography

In 2023, Dr. Gregory R. D'onofrio, MD had a list price for cardiac imaging, color Doppler echocardiography, Doppler echocardiography, and spectral Doppler echocardiography that was lower than the list prices billed to Medicare by 90% of providers in related specialties within Connecticut. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Top 25%

By Affordability:

echocardiogram

transthoracic echocardiography

In 2012, Dr. Gregory R. D'onofrio, MD had a list price for echocardiogram (echo), and transthoracic echocardiography (TTE) that was lower than the list prices billed to Medicare by 75% of providers in related specialties within Connecticut. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2012 were hospital care, inpatient care, cardiac procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	138
doctor visit	1246
hospital care	613
inpatient care	613
stress testing	36
ultrasound (sonogram)	113

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2013 were cardiac procedures, hospital care, inpatient care and ultrasound (sonogram).

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	698
doctor visit	1194
hospital care	566
inpatient care	566
nuclear scan	34
stress testing	242
ultrasound (sonogram)	539

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	830
Female	943

**Ethnicity**
Non-Hispanic White	1386
Black	209
Hispanic	117
Asian	0
Other	32
Native American	0

**Age**
From 65 to 74	519
From 75 to 84	638
85 and over	472
Less than 65	144

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2013

Hypertension	75
High Cholesterol	67
Stroke	10
Ischemic Heart Disease	55
Depression	23
Chronic Kidney Disease	27
Asthma	10
Osteoperosis	9
Atrial Fibrilation	27
Heart Failure	36
Chronic Obstructive Pulmonary Disease	14
Diabetes	37
Dementia	19
Cancer	13

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2014 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	685
doctor visit	1261
hospital care	547
inpatient care	547
nuclear scan	13
stress testing	214
ultrasound (sonogram)	550

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	762
Female	866

**Ethnicity**
Non-Hispanic White	1266
Black	192
Hispanic	98
Asian	36
Other	0
Native American	0

**Age**
From 65 to 74	465
From 75 to 84	563
85 and over	486
Less than 65	114

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2014

Hypertension	75
High Cholesterol	68
Stroke	9
Ischemic Heart Disease	53
Depression	22
Chronic Kidney Disease	27
Asthma	9
Osteoperosis	9
Atrial Fibrilation	29
Heart Failure	34
Chronic Obstructive Pulmonary Disease	15
Diabetes	36
Dementia	19
Cancer	14

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2015 were hospital care, inpatient care, cardiac procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	402
doctor visit	1132
emergency care	19
hospital care	532
inpatient care	532
nuclear scan	16
stress testing	87
ultrasound (sonogram)	345

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	1166
Female	1308

**Ethnicity**
Non-Hispanic White	1926
Black	294
Hispanic	172
Asian	48
Other	0
Native American	0

**Age**
From 65 to 74	684
From 75 to 84	876
85 and over	722
Less than 65	192

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2015

Hypertension	75
High Cholesterol	67
Stroke	11
Ischemic Heart Disease	54
Depression	22
Chronic Kidney Disease	29
Asthma	12
Osteoperosis	10
Atrial Fibrilation	31
Heart Failure	35
Chronic Obstructive Pulmonary Disease	16
Diabetes	37
Dementia	18
Cancer	15

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2016 were hospital care, inpatient care, cardiac procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	309
doctor visit	1105
hospital care	482
inpatient care	482
stress testing	80
ultrasound (sonogram)	260

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	526
Female	585

**Ethnicity**
Non-Hispanic White	857
Black	132
Hispanic	76
Asian	23
Other	0
Native American	0

**Age**
From 65 to 74	310
From 75 to 84	366
85 and over	358
Less than 65	77

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2016

Hypertension	75
High Cholesterol	64
Stroke	9
Ischemic Heart Disease	54
Depression	22
Chronic Kidney Disease	35
Asthma	19
Osteoperosis	10
Atrial Fibrilation	30
Heart Failure	34
Chronic Obstructive Pulmonary Disease	17
Diabetes	34
Dementia	18
Cancer	16

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2017 were hospital care, inpatient care, cardiac procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	136
doctor visit	957
hospital care	315
inpatient care	315
stress testing	25
ultrasound (sonogram)	111

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	379
Female	409

**Ethnicity**
Non-Hispanic White	598
Black	93
Hispanic	59
Asian	22
Other	16
Native American	0

**Age**
From 65 to 74	213
From 75 to 84	263
85 and over	257
Less than 65	55

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2017

Hypertension	75
High Cholesterol	57
Stroke	10
Ischemic Heart Disease	58
Depression	24
Chronic Kidney Disease	36
Asthma	7
Osteoperosis	8
Atrial Fibrilation	32
Heart Failure	35
Chronic Obstructive Pulmonary Disease	15
Diabetes	36
Dementia	18
Cancer	13

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2018 were hospital care, inpatient care, cardiac procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	328
doctor visit	902
hospital care	353
inpatient care	353
nuclear scan	20
stress testing	74
ultrasound (sonogram)	283

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	422
Female	443

**Ethnicity**
Non-Hispanic White	652
Black	101
Hispanic	65
Asian	25
Other	22
Native American	0

**Age**
From 65 to 74	268
From 75 to 84	272
85 and over	269
Less than 65	56

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2018

Hypertension	75
High Cholesterol	65
Stroke	12
Ischemic Heart Disease	58
Depression	23
Chronic Kidney Disease	34
Asthma	9
Osteoperosis	9
Atrial Fibrilation	31
Heart Failure	36
Chronic Obstructive Pulmonary Disease	14
Diabetes	36
Dementia	18
Cancer	14

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2019 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	329
doctor visit	688
hospital care	276
inpatient care	276
nuclear scan	16
stress testing	49
ultrasound (sonogram)	295

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	405
Female	439

**Ethnicity**
Non-Hispanic White	0
Black	103
Hispanic	68
Asian	0
Other	25
Native American	0

**Age**
From 65 to 74	255
From 75 to 84	278
85 and over	0
Less than 65	72

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2019

Hypertension	75
High Cholesterol	73
Stroke	9
Ischemic Heart Disease	57
Depression	27
Chronic Kidney Disease	37
Asthma	9
Osteoperosis	10
Atrial Fibrilation	29
Heart Failure	38
Chronic Obstructive Pulmonary Disease	15
Diabetes	36
Dementia	21
Cancer	15

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2020 were hospital care, inpatient care, ultrasound (sonogram) and cardiac procedures.

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	141
doctor visit	609
hospital care	229
inpatient care	229
ultrasound (sonogram)	141

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	272
Female	265

**Ethnicity**
Non-Hispanic White	393
Black	75
Hispanic	45
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	141
From 75 to 84	193
85 and over	173
Less than 65	30

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2020

Hypertension	75
High Cholesterol	71
Stroke	11
Ischemic Heart Disease	55
Depression	24
Chronic Kidney Disease	36
Asthma	8
Osteoperosis	10
Atrial Fibrilation	28
Heart Failure	32
Chronic Obstructive Pulmonary Disease	12
Diabetes	37
Dementia	23
Cancer	15

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2021 were hospital care, inpatient care, ultrasound (sonogram) and cardiac procedures.

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	216
doctor visit	545
hospital care	327
inpatient care	327
stress testing	12
ultrasound (sonogram)	216

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	301
Female	330

**Ethnicity**
Non-Hispanic White	463
Black	83
Hispanic	57
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	180
From 75 to 84	224
85 and over	192
Less than 65	35

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2021

Hypertension	75
High Cholesterol	73
Stroke	12
Ischemic Heart Disease	52
Depression	26
Chronic Kidney Disease	37
Asthma	8
Osteoperosis	10
Atrial Fibrilation	30
Heart Failure	35
Chronic Obstructive Pulmonary Disease	13
Diabetes	33
Dementia	24
Cancer	15

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2022 were hospital care, inpatient care, ultrasound (sonogram) and cardiac procedures.

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	114
doctor visit	457
hospital care	296
inpatient care	296
ultrasound (sonogram)	114

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	263
Female	310

**Ethnicity**
Non-Hispanic White	452
Black	50
Hispanic	38
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	142
From 75 to 84	222
85 and over	181
Less than 65	28

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	18
Ischemic Heart Disease	45
Depression	21
Chronic Kidney Disease	23
Asthma	11
Osteoperosis	16
Atrial Fibrilation	36
Heart Failure	34
Chronic Obstructive Pulmonary Disease	17
Diabetes	33
Dementia	18
Cancer	19

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT during 2023 were hospital care, inpatient care, ultrasound (sonogram) and cardiac procedures.

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

cardiac procedures	36
doctor visit	406
hospital care	118
inpatient care	118
ultrasound (sonogram)	36

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Male	151
Female	176

**Ethnicity**
Non-Hispanic White	240
Black	34
Hispanic	24
Asian	11
Other	18
Native American	0

**Age**
From 65 to 74	104
From 75 to 84	122
85 and over	90
Less than 65	11

Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	14
Ischemic Heart Disease	46
Depression	21
Chronic Kidney Disease	26
Asthma	9
Osteoperosis	16
Atrial Fibrilation	39
Heart Failure	31
Chronic Obstructive Pulmonary Disease	13
Diabetes	31
Dementia	13
Cancer	20

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. Gregory R. D'onofrio, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gregory R. D'onofrio, MD treated as a cardiologist in STAMFORD, CT were hospital care, inpatient care, cardiac procedures and ultrasound (sonogram).

cardiac procedures	294
doctor visit	875
emergency care	19
hospital care	387
inpatient care	387
nuclear scan	19
stress testing	91
ultrasound (sonogram)	250

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. Gregory R. D'onofrio, MD.

**Gender**
Female	506
Male	456

**Ethnicity**
Black / African American	113
Asian / Pacific Islander	13
Non-Hispanic White	686
Hispanic	68
Native American / Alaskan Native	0
Other	9

**Age**
85 and over	266
75 to 84	334
Less than 65	67
65 to 74	273

Average of Total of Conditions of Medicare patients treated by Dr. Gregory R. D'onofrio, MD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Gregory R. D'onofrio, MD treated were hypertension, high cholesterol, ischemic heart disease and diabetes.

Hypertension	68
High Cholesterol	62
Stroke	10
Ischemic Heart Disease	48
Depression	21
Chronic Kidney Disease	28
Asthma	9
Osteoporosis	9
Heart Failure	31
Chronic Obstructive Pulmonary Disease	13
Diabetes	32
Atrial Fibrillation	28
Dementia	17
Cancer	14

Education & Training

Dr. Gregory R. D'onofrio, MD graduated from George Washington University School of Medicine in 1990. He completed residency at St. Vincent's Medical Center GME. He is certified by the American Board of Internal Medicine: Cardiovascular Disease and has a state license in Connecticut.

Medical School: George Washington University School of Medicine (1990)

Residency: St. Vincent's Medical Center GME (1990)

Board Certification: American Board of Internal Medicine: Cardiovascular Disease

Licensed In: Connecticut

Affiliations & Hospitals

Dr. Gregory R. D'onofrio, MD is associated with these hospitals and organizations:

Stamford Health Medical Group

Ratings & Reviews

Dr. Gregory R. D'onofrio, MD has an exceptional overall rating with an average of 4.6 out of 5 stars based on 5 ratings. We collect ratings and reviews of Dr. Gregory R. D'onofrio, MD from all over the web to help you find the right in STAMFORD, CT.

4.6

Overall Rating

(5 Ratings)

Leave a Review

Reviews From Around The Web

Overall Rating: 5.0 2025-06-26

Patient verified via Press Ganey

Dr D my cardiologist was very professional and detailed in explaining everything and what the expectations are.

Overall Rating: 5.0 2025-05-01

Patient verified via Press Ganey

Doctor is the best

Overall Rating: 5.0 2025-06-05

Patient verified via Press Ganey

Good

General Payments

These charts describe general payments received by Dr. Gregory R. D'onofrio, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Daiichi Sankyo Inc.	$273 SAVAYSA $273
Boston Scientific Corporation	$194 TACHY HF $87	Tachy System $53	Brady Generator $26	TACHY GENERATOR $15	$12
St. Jude Medical, Inc.	$162 Electrophysiology $162
AstraZeneca Pharmaceuticals LP	$158 BRILINTA $78	$80
Merck Sharp & Dohme Corporation	$130 KEYTRUDA $130
Other	$497 Adempas $125	XIAFLEX $122	BioMonitor $115	Heart Valves $99	LifeVest $22	Other $14

**Types of Payments**
Food and Beverage	$1,256
Education	$158

Biography

Dr. Gregory D'onofrio is a specialist in general practice and interventional cardiology. He attended medical school at George Washington University School of Medicine and Health Sciences. He is rated highly by his patients. Dr. D'onofrio is conversant in Italian. Dr. D'onofrio is affiliated with Stamford Health Medical Group (SHMG). Doctor.com reports that he is accepting new patients at his office in Stamford, CT.