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Dr. John William Zamarra, MD

Accepting New Patients

(Dr. John W. Zamarra, M.D.)

(6 Ratings)

Specializes in: Adult Cardiology

SUNY, University at Buffalo School of Medicine & Biomedical Sciences (1975)

1001 East Chapman Avenue Suite B
Fullerton, CA 92831

(714) 871-5200

Dr. John William Zamarra, MD is a cardiologist in Fullerton, CA specializing in adult cardiology. He graduated from SUNY, University at Buffalo School of Medicine & Biomedical Sciences in 1975 and has 51 years of experience. Dr. John William Zamarra, MD is affiliated with BEAR VALLEY COMMUNITY HEALTH CARE DISTRICT.

Office Locations

1001 East Chapman Avenue Suite B
Fullerton, CA 92831

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In The News (see more mentions in the news)

“"It's amazing" said Dr. John Zamarra, a cardiologist in La Brea who has been Rindt's physician for more than five years.”—"The Ayurvedic Way : Ancient Medical Treatment Uses Inner Peace, Hot Oil", Los Angeles Times, April 2025

“Dr. John Zamarra, a cardiologist and the director of cardiac rehabilitation at Placentia Linda Hospital, uses a treadmill stress test in his practice but says he doesn't recommend its use in mass...”—"Shape Up! : Fitness Tests Help Map Route to Better Body", Los Angeles Times, April 2025

“Brea cardiologist John Zamarra said he has practiced transcendental meditation regularly for 18 years and often recommends it to his patients.”—"HEALTH & FITNESS : COPING WITH STRESS", Los Angeles Times, February 2025

Noteworthy Medicare Patient Procedures Performed by Dr. John William Zamarra, MD in 2023

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

Top 5%

By Affordability:

cardiac imaging

color Doppler echocardiography

Doppler echocardiography

echocardiogram

spectral Doppler echocardiography

In 2023, Dr. John William Zamarra, MD had a list price for cardiac imaging, color Doppler echocardiography, Doppler echocardiography, echocardiogram (echo), and spectral Doppler echocardiography that was lower than the list prices billed to Medicare by 95% of providers in related specialties within California. 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 10%

By Affordability:

cardiac stress testing

stress testing

transthoracic echocardiography

In 2023, Dr. John William Zamarra, MD had a list price for cardiac (heart) stress testing, stress testing, and transthoracic echocardiography (TTE) that was lower than the list prices billed to Medicare by 90% of providers in related specialties within California. 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

stress EKG

By Affordability:

electrocardiogram

stress EKG

In 2012, among providers in related specialties within California, Dr. John William Zamarra, MD performed more Doppler echocardiography, and stress EKG procedures for Medicare patients than 75% of them and he also had a list price for electrocardiogram (EKG), and stress EKG 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 William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2012 were blood draw, ultrasound (sonogram), cardiac procedures and hospital care.

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

abdominal imaging	21
blood draw	389
cardiac procedures	342
doctor visit	876
hospital care	341
inpatient care	341
nursing home care	77
pelvic imaging	21
stress testing	43
ultrasound (sonogram)	380
vascular procedures	233

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2013 were cardiac procedures, hospital care, inpatient care and ultrasound (sonogram).

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

blood draw	252
cardiac procedures	524
doctor visit	895
hospital care	399
inpatient care	399
nursing home care	141
stress testing	51
ultrasound (sonogram)	331
vascular procedures	200

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	370
Female	499

**Ethnicity**
Non-Hispanic White	660
Black	0
Hispanic	73
Asian	109
Other	13
Native American	0

**Age**
From 65 to 74	278
From 75 to 84	300
85 and over	223
Less than 65	68

Conditions of Medicare patients treated by Dr. John William Zamarra, MD in 2013

Hypertension	75
High Cholesterol	67
Stroke	13
Ischemic Heart Disease	51
Depression	26
Chronic Kidney Disease	32
Asthma	11
Osteoperosis	11
Atrial Fibrilation	20
Heart Failure	36
Chronic Obstructive Pulmonary Disease	20
Diabetes	46
Dementia	23
Cancer	12

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2014 were cardiac procedures, hospital care, inpatient care and ultrasound (sonogram).

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

cardiac procedures	525
doctor visit	854
hospital care	346
inpatient care	346
nursing home care	111
stress testing	41
ultrasound (sonogram)	284
vascular procedures	190

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	378
Female	496

**Ethnicity**
Non-Hispanic White	663
Black	0
Hispanic	91
Asian	102
Other	0
Native American	0

**Age**
From 65 to 74	281
From 75 to 84	290
85 and over	234
Less than 65	69

Conditions of Medicare patients treated by Dr. John William Zamarra, MD in 2014

Hypertension	75
High Cholesterol	69
Stroke	11
Ischemic Heart Disease	48
Depression	27
Chronic Kidney Disease	35
Asthma	12
Osteoperosis	12
Atrial Fibrilation	23
Heart Failure	37
Chronic Obstructive Pulmonary Disease	20
Diabetes	41
Dementia	22
Cancer	13

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2015 were hospital care, inpatient care, ultrasound (sonogram) and cardiac procedures.

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

blood draw	178
cardiac procedures	240
doctor visit	944
hospital care	576
inpatient care	576
nursing home care	150
stress testing	36
ultrasound (sonogram)	340
vascular procedures	222

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	704
Female	884

**Ethnicity**
Non-Hispanic White	1204
Black	36
Hispanic	172
Asian	138
Other	0
Native American	0

**Age**
From 65 to 74	538
From 75 to 84	522
85 and over	414
Less than 65	114

Conditions of Medicare patients treated by Dr. John William Zamarra, MD in 2015

Hypertension	75
High Cholesterol	69
Stroke	18
Ischemic Heart Disease	58
Depression	30
Chronic Kidney Disease	41
Asthma	19
Osteoperosis	12
Atrial Fibrilation	29
Heart Failure	46
Chronic Obstructive Pulmonary Disease	26
Diabetes	44
Dementia	26
Cancer	12

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2016 were hospital care, inpatient care, cardiac procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

blood draw	59
cardiac procedures	114
doctor visit	852
hospital care	482
inpatient care	482
stress testing	49
ultrasound (sonogram)	112
vascular procedures	40

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	332
Female	428

**Ethnicity**
Non-Hispanic White	567
Black	0
Hispanic	82
Asian	78
Other	18
Native American	0

**Age**
From 65 to 74	256
From 75 to 84	261
85 and over	191
Less than 65	52

Conditions of Medicare patients treated by Dr. John William Zamarra, MD in 2016

Hypertension	75
High Cholesterol	70
Stroke	20
Ischemic Heart Disease	58
Depression	29
Chronic Kidney Disease	43
Asthma	29
Osteoperosis	11
Atrial Fibrilation	26
Heart Failure	43
Chronic Obstructive Pulmonary Disease	26
Diabetes	44
Dementia	30
Cancer	13

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2017 were hospital care, inpatient care, ultrasound (sonogram) and cardiac procedures.

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

ambulatory monitoring	12
cardiac procedures	142
doctor visit	904
hospital care	255
inpatient care	255
nursing home care	91
stress testing	36
ultrasound (sonogram)	187
vascular procedures	93

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	396
Female	509

**Ethnicity**
Non-Hispanic White	689
Black	17
Hispanic	101
Asian	80
Other	0
Native American	0

**Age**
From 65 to 74	302
From 75 to 84	304
85 and over	207
Less than 65	92

Conditions of Medicare patients treated by Dr. John William Zamarra, MD in 2017

Hypertension	75
High Cholesterol	61
Stroke	13
Ischemic Heart Disease	49
Depression	31
Chronic Kidney Disease	42
Asthma	9
Osteoperosis	13
Atrial Fibrilation	26
Heart Failure	37
Chronic Obstructive Pulmonary Disease	23
Diabetes	40
Dementia	26
Cancer	12

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2018 were ultrasound (sonogram), cardiac procedures, vascular procedures and hospital care.

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

cardiac procedures	209
doctor visit	1023
hospital care	108
inpatient care	108
nursing home care	97
stress testing	66
ultrasound (sonogram)	260
vascular procedures	110

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	394
Female	419

**Ethnicity**
Non-Hispanic White	621
Black	0
Hispanic	87
Asian	72
Other	18
Native American	0

**Age**
From 65 to 74	290
From 75 to 84	273
85 and over	185
Less than 65	65

Conditions of Medicare patients treated by Dr. John William Zamarra, MD in 2018

Hypertension	75
High Cholesterol	65
Stroke	12
Ischemic Heart Disease	46
Depression	29
Chronic Kidney Disease	42
Asthma	11
Osteoperosis	10
Atrial Fibrilation	24
Heart Failure	35
Chronic Obstructive Pulmonary Disease	21
Diabetes	37
Dementia	26
Cancer	13

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2019 were hospital care, inpatient care, ultrasound (sonogram) and vascular procedures.

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

cardiac procedures	57
doctor visit	450
hospital care	172
inpatient care	172
stress testing	18
ultrasound (sonogram)	130
vascular procedures	73

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	248
Female	305

**Ethnicity**
Non-Hispanic White	402
Black	0
Hispanic	62
Asian	60
Other	16
Native American	0

**Age**
From 65 to 74	198
From 75 to 84	194
85 and over	120
Less than 65	41

Conditions of Medicare patients treated by Dr. John William Zamarra, MD in 2019

Hypertension	75
High Cholesterol	65
Stroke	9
Ischemic Heart Disease	51
Depression	28
Chronic Kidney Disease	42
Asthma	9
Osteoperosis	10
Atrial Fibrilation	23
Heart Failure	34
Chronic Obstructive Pulmonary Disease	20
Diabetes	39
Dementia	24
Cancer	14

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2020 were hospital care, inpatient care, ultrasound (sonogram) and vascular procedures.

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

cardiac procedures	15
hospital care	289
inpatient care	289
ultrasound (sonogram)	61
vascular procedures	46

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	184
Female	253

**Ethnicity**
Non-Hispanic White	288
Black	0
Hispanic	74
Asian	47
Other	15
Native American	0

**Age**
From 65 to 74	146
From 75 to 84	138
85 and over	102
Less than 65	51

Conditions of Medicare patients treated by Dr. John William Zamarra, MD in 2020

Hypertension	75
High Cholesterol	70
Stroke	11
Ischemic Heart Disease	53
Depression	30
Chronic Kidney Disease	54
Asthma	14
Osteoperosis	15
Atrial Fibrilation	26
Heart Failure	40
Chronic Obstructive Pulmonary Disease	23
Diabetes	40
Dementia	31
Cancer	14

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2021 were hospital care, inpatient care, ultrasound (sonogram) and vascular procedures.

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

doctor visit	35
hospital care	321
inpatient care	321
ultrasound (sonogram)	18
vascular procedures	18

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	69
Female	92

**Ethnicity**
Non-Hispanic White	107
Black	0
Hispanic	0
Asian	25
Other	0
Native American	0

**Age**
From 65 to 74	57
From 75 to 84	65
85 and over	22
Less than 65	17

Conditions of Medicare patients treated by Dr. John William Zamarra, MD in 2021

Hypertension	75
High Cholesterol	69
Stroke	16
Ischemic Heart Disease	46
Depression	35
Chronic Kidney Disease	55
Asthma	10
Osteoperosis	11
Atrial Fibrilation	19
Heart Failure	39
Chronic Obstructive Pulmonary Disease	23
Diabetes	46
Dementia	27
Cancer	18

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA during 2022 were hospital care, inpatient care, cardiac procedures and ultrasound (sonogram).

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

cardiac procedures	130
doctor visit	204
hospital care	182
inpatient care	182
stress testing	37
ultrasound (sonogram)	93

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	469
Female	461

**Ethnicity**
Non-Hispanic White	766
Black	0
Hispanic	75
Asian	47
Other	22
Native American	0

**Age**
From 65 to 74	369
From 75 to 84	306
85 and over	169
Less than 65	86

Conditions of Medicare patients treated by Dr. John William Zamarra, MD in 2022

Hypertension	75
High Cholesterol	74
Stroke	16
Ischemic Heart Disease	36
Depression	24
Chronic Kidney Disease	23
Asthma	12
Osteoperosis	12
Atrial Fibrilation	30
Heart Failure	28
Chronic Obstructive Pulmonary Disease	25
Diabetes	36
Dementia	10
Cancer	17

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. John William Zamarra, MD for Medicare patients.

The highest averages for the top procedures that Dr. John William Zamarra, MD treated as a cardiologist in Fullerton, CA were hospital care, inpatient care, cardiac procedures and blood draw.

abdominal imaging	21
ambulatory monitoring	12
blood draw	219
cardiac procedures	229
doctor visit	703
hospital care	315
inpatient care	315
nursing home care	111
pelvic imaging	21
stress testing	41
ultrasound (sonogram)	199
vascular procedures	122

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. John William Zamarra, MD.

**Gender**
Male	322
Female	395

**Ethnicity**
Black / African American	4
Asian / Pacific Islander	68
Non-Hispanic White	542
Native American / Alaskan Native	0
Hispanic	74
Other	9

**Age**
75 to 84	241
85 and over	169
Less than 65	59
65 to 74	246

Average of Total of Conditions of Medicare patients treated by Dr. John William Zamarra, MD From 2012 - 2022

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

Hypertension	68
High Cholesterol	61
Stroke	12
Ischemic Heart Disease	45
Depression	26
Chronic Kidney Disease	37
Asthma	12
Osteoporosis	10
Heart Failure	34
Chronic Obstructive Pulmonary Disease	20
Diabetes	37
Atrial Fibrillation	22
Dementia	22
Cancer	12

Education & Training

Dr. John William Zamarra, MD graduated from SUNY, University at Buffalo School of Medicine & Biomedical Sciences in 1975. He completed residency at SUNY, University at Buffalo Affiliated Hospitals. He is certified by the American Board of Internal Medicine: Cardiovascular Disease and has a state license in California.

Medical School: SUNY, University at Buffalo School of Medicine & Biomedical Sciences (1975)

Residency: SUNY, University at Buffalo Affiliated Hospitals

Board Certification: American Board of Internal Medicine: Cardiovascular Disease

Licensed In: California

Affiliations & Hospitals

Dr. John William Zamarra, MD is associated with these hospitals and organizations:

BEAR VALLEY COMMUNITY HEALTH CARE DISTRICT

Ratings & Reviews

Dr. John William Zamarra, MD has a high overall rating with an average of 3.67 out of 5 stars based on 6 ratings. We collect ratings and reviews of Dr. John William Zamarra, MD from all over the web to help you find the right in Fullerton, CA.

3.67

Overall Rating

(6 Ratings)

Leave a Review

Reviews From Around The Web

Overall Rating: 5.0 2024-01-29

Patient verified via Press Ganey

For the first time in a long time I felt a doctor listened and was proactive. Excellent care

General Payments

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

**Payments by Company**
E.R. Squibb & Sons, L.L.C.	$536 ELIQUIS $536
Novartis Pharmaceuticals Corporation	$487 ENTRESTO $221	LEQVIO $151	$114
Amarin Pharma Inc.	$369 Vascepa $369
Janssen Pharmaceuticals, Inc	$315 XARELTO $241	INVOKANA $74
Arbor Pharmaceuticals, Inc.	$308 Edarbyclor $250	Edarbi $58
Other	$1,640 LIVALO $225	PRALUENT $157	NEXLETOL $124	ZETIA $115	ELIQUIS $106	Other $913

**Types of Payments**
Food and Beverage	$3,633
Education	$23

Biography

Dr. John Zamarra practices adult cardiology in Fullerton, CA. He is rated 3.5 stars (out of 5) by his patients. He is a graduate of SUNY, University at Buffalo School of Medicine & Biomedical Sciences. Dr. Zamarra trained at Alameda County Medical Center, Highland Hospital and a hospital affiliated with SUNY, University at Buffalo for residency. He has an open panel in Fullerton, CA according to Doctor.com.