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Dr. John T. O'Brien, MD

Accepting New Patients

(3 Ratings)

Specializes in: Adult Cardiology

Georgetown University School of Medicine (1977)

8081 Innovation Park Drive Suite 700
Fairfax, VA 22031

(571) 472-2900

Dr. John T. O'Brien, MD is a cardiologist in Fairfax, VA specializing in adult cardiology. He graduated from Georgetown University School of Medicine in 1977 and has 49 years of experience.

Office Locations

8081 Innovation Park Drive Suite 700
Fairfax, VA 22031

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Noteworthy Medicare Patient Procedures Performed by Dr. John T. O'Brien, 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

In 2023, Dr. John T. O'Brien, MD had a list price for cardiac imaging that was lower than the list prices billed to Medicare by 90% of providers in related specialties within Virginia. 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 Volume:

Doppler echocardiography

echocardiogram

ultrasound

By Affordability:

echocardiogram

hospital care

inpatient care

inpatient hospital care

transthoracic echocardiography

In 2012, among providers in related specialties within Virginia, Dr. John T. O'Brien, MD performed more Doppler echocardiography, echocardiogram (echo), and ultrasound (sonogram) procedures for Medicare patients than 75% of them and he also had a list price for echocardiogram (echo), hospital care, inpatient care, inpatient hospital care (for patient admitted to hospital), and transthoracic echocardiography (TTE) that was lower than the list prices billed to Medicare by 75% of them. 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. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2012 were cardiac procedures, stress testing, ultrasound (sonogram) and hospital care.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

ambulatory monitoring	52
cardiac procedures	1027
catheterization	29
diagnostic procedures	29
doctor visit	890
hospital care	198
inpatient care	159
minimally invasive procedures	29
nuclear scan	178
outpatient care	26
stress testing	494
ultrasound (sonogram)	481
vascular procedures	58

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2013 were cardiac procedures, ultrasound (sonogram), stress testing and hospital care.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

ambulatory monitoring	40
cardiac procedures	953
cardioversion	15
catheterization	23
diagnostic procedures	23
doctor visit	895
hospital care	193
inpatient care	181
minimally invasive procedures	23
nuclear scan	103
outpatient care	12
stress testing	381
ultrasound (sonogram)	563
vascular procedures	77

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	835
Female	858

**Ethnicity**
Non-Hispanic White	1349
Black	94
Hispanic	71
Asian	143
Other	36
Native American	0

**Age**
From 65 to 74	582
From 75 to 84	635
85 and over	369
Less than 65	107

Conditions of Medicare patients treated by Dr. John T. O'Brien, MD in 2013

Hypertension	75
High Cholesterol	71
Stroke	13
Ischemic Heart Disease	61
Depression	19
Chronic Kidney Disease	38
Asthma	12
Osteoperosis	7
Atrial Fibrilation	31
Heart Failure	35
Chronic Obstructive Pulmonary Disease	19
Diabetes	36
Dementia	17
Cancer	15

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2014 were cardiac procedures, ultrasound (sonogram), stress testing and vascular procedures.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

abdominal imaging	13
ambulatory monitoring	52
angioplasty	38
cardiac procedures	1017
catheterization	89
diagnostic procedures	32
doctor visit	874
hospital care	156
inpatient care	156
minimally invasive procedures	89
pelvic imaging	13
stent placement (stenting)	19
stress testing	300
ultrasound (sonogram)	702
vascular procedures	158

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	943
Female	891

**Ethnicity**
Non-Hispanic White	1430
Black	119
Hispanic	86
Asian	144
Other	55
Native American	0

**Age**
From 65 to 74	660
From 75 to 84	658
85 and over	398
Less than 65	118

Conditions of Medicare patients treated by Dr. John T. O'Brien, MD in 2014

Hypertension	75
High Cholesterol	70
Stroke	13
Ischemic Heart Disease	58
Depression	21
Chronic Kidney Disease	39
Asthma	12
Osteoperosis	8
Atrial Fibrilation	27
Heart Failure	33
Chronic Obstructive Pulmonary Disease	19
Diabetes	37
Dementia	19
Cancer	15

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2015 were cardiac procedures, ultrasound (sonogram), stress testing and hospital care.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

abdominal imaging	11
ambulatory monitoring	49
cardiac procedures	853
cardioversion	12
catheterization	22
diagnostic procedures	22
doctor visit	873
hospital care	302
inpatient care	271
minimally invasive procedures	22
outpatient care	31
pelvic imaging	11
stress testing	309
ultrasound (sonogram)	574
vascular procedures	123

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	2370
Female	2412

**Ethnicity**
Non-Hispanic White	3706
Black	336
Hispanic	198
Asian	412
Other	130
Native American	0

**Age**
From 65 to 74	1648
From 75 to 84	1712
85 and over	1046
Less than 65	376

Conditions of Medicare patients treated by Dr. John T. O'Brien, MD in 2015

Hypertension	75
High Cholesterol	72
Stroke	16
Ischemic Heart Disease	58
Depression	22
Chronic Kidney Disease	40
Asthma	17
Osteoperosis	10
Atrial Fibrilation	31
Heart Failure	35
Chronic Obstructive Pulmonary Disease	19
Diabetes	37
Dementia	19
Cancer	15

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2016 were cardiac procedures, ultrasound (sonogram), stress testing and hospital care.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

ambulatory monitoring	56
angioplasty	24
cardiac procedures	997
catheterization	70
diagnostic procedures	34
doctor visit	934
hospital care	219
inpatient care	201
minimally invasive procedures	70
outpatient care	18
stent placement (stenting)	12
stress testing	316
ultrasound (sonogram)	647
vascular procedures	126

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	1288
Female	1251

**Ethnicity**
Non-Hispanic White	1919
Black	180
Hispanic	112
Asian	242
Other	0
Native American	0

**Age**
From 65 to 74	901
From 75 to 84	907
85 and over	533
Less than 65	198

Conditions of Medicare patients treated by Dr. John T. O'Brien, MD in 2016

Hypertension	75
High Cholesterol	70
Stroke	14
Ischemic Heart Disease	57
Depression	20
Chronic Kidney Disease	45
Asthma	24
Osteoperosis	9
Atrial Fibrilation	28
Heart Failure	34
Chronic Obstructive Pulmonary Disease	20
Diabetes	38
Dementia	20
Cancer	15

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2017 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

abdominal imaging	12
ambulatory monitoring	56
angioplasty	28
cardiac procedures	945
catheterization	91
diagnostic procedures	49
doctor visit	937
hospital care	348
inpatient care	322
minimally invasive procedures	91
outpatient care	26
pelvic imaging	12
stent placement (stenting)	14
stress testing	234
ultrasound (sonogram)	643
vascular procedures	128

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	1088
Female	1014

**Ethnicity**
Non-Hispanic White	1621
Black	142
Hispanic	91
Asian	180
Other	68
Native American	0

**Age**
From 65 to 74	695
From 75 to 84	825
85 and over	448
Less than 65	134

Conditions of Medicare patients treated by Dr. John T. O'Brien, MD in 2017

Hypertension	75
High Cholesterol	64
Stroke	14
Ischemic Heart Disease	60
Depression	20
Chronic Kidney Disease	46
Asthma	11
Osteoperosis	8
Atrial Fibrilation	31
Heart Failure	37
Chronic Obstructive Pulmonary Disease	19
Diabetes	39
Dementia	21
Cancer	15

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2018 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

ambulatory monitoring	33
cardiac procedures	789
catheterization	24
diagnostic procedures	24
doctor visit	960
hospital care	318
inpatient care	318
minimally invasive procedures	24
stress testing	157
ultrasound (sonogram)	637
vascular procedures	110

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	1305
Female	1238

**Ethnicity**
Non-Hispanic White	1908
Black	185
Hispanic	119
Asian	239
Other	0
Native American	0

**Age**
From 65 to 74	814
From 75 to 84	1014
85 and over	539
Less than 65	176

Conditions of Medicare patients treated by Dr. John T. O'Brien, MD in 2018

Hypertension	75
High Cholesterol	74
Stroke	15
Ischemic Heart Disease	60
Depression	22
Chronic Kidney Disease	50
Asthma	12
Osteoperosis	9
Atrial Fibrilation	31
Heart Failure	40
Chronic Obstructive Pulmonary Disease	20
Diabetes	38
Dementia	23
Cancer	16

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2019 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

ambulatory monitoring	52
cardiac procedures	763
catheterization	12
diagnostic procedures	12
doctor visit	959
hospital care	246
inpatient care	246
minimally invasive procedures	12
stress testing	127
ultrasound (sonogram)	612
vascular procedures	52

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	1379
Female	1299

**Ethnicity**
Non-Hispanic White	1995
Black	209
Hispanic	129
Asian	234
Other	0
Native American	0

**Age**
From 65 to 74	836
From 75 to 84	999
85 and over	641
Less than 65	202

Conditions of Medicare patients treated by Dr. John T. O'Brien, MD in 2019

Hypertension	75
High Cholesterol	74
Stroke	14
Ischemic Heart Disease	59
Depression	24
Chronic Kidney Disease	50
Asthma	13
Osteoperosis	10
Atrial Fibrilation	30
Heart Failure	43
Chronic Obstructive Pulmonary Disease	19
Diabetes	36
Dementia	24
Cancer	16

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2020 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

ambulatory monitoring	30
cardiac procedures	723
doctor visit	849
hospital care	256
inpatient care	256
stress testing	92
ultrasound (sonogram)	623
vascular procedures	22

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	1323
Female	1153

**Ethnicity**
Non-Hispanic White	1816
Black	191
Hispanic	114
Asian	214
Other	141
Native American	0

**Age**
From 65 to 74	857
From 75 to 84	945
85 and over	485
Less than 65	189

Conditions of Medicare patients treated by Dr. John T. O'Brien, MD in 2020

Hypertension	75
High Cholesterol	73
Stroke	15
Ischemic Heart Disease	60
Depression	24
Chronic Kidney Disease	52
Asthma	11
Osteoperosis	9
Atrial Fibrilation	31
Heart Failure	42
Chronic Obstructive Pulmonary Disease	17
Diabetes	39
Dementia	23
Cancer	16

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2021 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

ambulatory monitoring	28
cardiac procedures	718
doctor visit	981
hospital care	255
inpatient care	255
stress testing	59
ultrasound (sonogram)	657
vascular procedures	26

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	1290
Female	1194

**Ethnicity**
Non-Hispanic White	1833
Black	207
Hispanic	0
Asian	215
Other	115
Native American	0

**Age**
From 65 to 74	772
From 75 to 84	1036
85 and over	523
Less than 65	153

Conditions of Medicare patients treated by Dr. John T. O'Brien, MD in 2021

Hypertension	75
High Cholesterol	75
Stroke	13
Ischemic Heart Disease	61
Depression	24
Chronic Kidney Disease	50
Asthma	10
Osteoperosis	11
Atrial Fibrilation	32
Heart Failure	43
Chronic Obstructive Pulmonary Disease	17
Diabetes	36
Dementia	24
Cancer	17

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA during 2022 were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

cardiac procedures	772
doctor visit	718
hospital care	178
inpatient care	178
stress testing	51
ultrasound (sonogram)	737
vascular procedures	16

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	1334
Female	1277

**Ethnicity**
Non-Hispanic White	1908
Black	211
Hispanic	123
Asian	237
Other	132
Native American	0

**Age**
From 65 to 74	825
From 75 to 84	1093
85 and over	531
Less than 65	162

Conditions of Medicare patients treated by Dr. John T. O'Brien, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	20
Ischemic Heart Disease	52
Depression	23
Chronic Kidney Disease	36
Asthma	14
Osteoperosis	15
Atrial Fibrilation	42
Heart Failure	42
Chronic Obstructive Pulmonary Disease	19
Diabetes	37
Dementia	15
Cancer	20

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. John T. O'Brien, MD for Medicare patients.

The highest averages for the top procedures that Dr. John T. O'Brien, MD treated as a cardiologist in Fairfax, VA were cardiac procedures, ultrasound (sonogram), hospital care and inpatient care.

abdominal imaging	12
ambulatory monitoring	44
angioplasty	30
cardiac procedures	868
cardioversion	13
catheterization	45
diagnostic procedures	28
doctor visit	897
hospital care	242
inpatient care	231
minimally invasive procedures	45
nuclear scan	140
outpatient care	22
pelvic imaging	12
stent placement (stenting)	15
stress testing	229
ultrasound (sonogram)	625
vascular procedures	81

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John T. O'Brien, MD.

**Gender**
Male	1195
Female	1144

**Ethnicity**
Black / African American	170
Asian / Pacific Islander	205
Non-Hispanic White	1771
Hispanic	94
Native American / Alaskan Native	0
Other	61

**Age**
75 to 84	893
85 and over	501
Less than 65	165
65 to 74	780

Average of Total of Conditions of Medicare patients treated by Dr. John T. O'Brien, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. John T. O'Brien, MD treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension	68
High Cholesterol	65
Stroke	13
Ischemic Heart Disease	53
Depression	19
Chronic Kidney Disease	40
Asthma	12
Osteoporosis	8
Heart Failure	34
Chronic Obstructive Pulmonary Disease	17
Diabetes	33
Atrial Fibrillation	28
Cancer	14
Dementia	18

Education & Training

Dr. John T. O'Brien, MD graduated from Georgetown University School of Medicine in 1977. He has a state license in Virginia.

Medical School: Georgetown University School of Medicine (1977)

Licensed In: Virginia

Ratings & Reviews

Dr. John T. O'Brien, MD has an exceptional overall rating with an average of 5.0 out of 5 stars based on 3 ratings. We collect ratings and reviews of Dr. John T. O'Brien, MD from all over the web to help you find the right in Fairfax, VA.

Overall Rating

(3 Ratings)

Leave a Review

Reviews From Around The Web

Overall Rating: 5.0 2025-05-16

Patient verified via Press Ganey

Dr O'Brien is an outstanding physician. He has kept me going for years. I will miss him very much now that he is retiring.

Overall Rating: 5.0 2025-06-12

Patient verified via Press Ganey

Good experience

General Payments

These charts describe general payments received by Dr. John T. O'Brien, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Novartis Pharmaceuticals Corporation	$186 LEQVIO $126	ENTRESTO $60
Boston Scientific Corporation	$130 Tachy System $99	CTO $17	Balloon Catheters $14
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)	$89 LifeVest $89
E.R. Squibb & Sons, L.L.C.	$45 ELIQUIS $45
Bardy Diagnostics, Inc.	$35 Carnation Ambulatory Monitor $35
Other	$60 SAVAYSA $28	Coronary Orbital Atherectomy System $16	BYSTOLIC $15

**Types of Payments**
Food and Beverage	$545

Biography

Dr. John Obrien is an adult cardiology specialist in Falls Church, VA, Annandale, VA, and Fairfax, VA. On average, patients gave Dr. Obrien a rating of 5.0 stars (out of 5). He studied medicine at Georgetown University School of Medicine. According to Doctor.com, new patients are welcome to contact his office in Fairfax, VA.