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Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology

Accepting New Patients

(Dr. Gregory Marcus, MD)

(130 Ratings)

Specializes in: Genetics, Cardiology (Heart Disease), General Practice and Cardiac Electrophysiology (Heart Rhythm)

George Washington University School of Medicine and Health Sciences

Professional interests include: atrial tachycardia, atrial flutter, ventricular fibrillation, and more.

400 PARNASSUS AVENUE FLOOR 5
SAN FRANCISCO, CA 94143

(415) 353-2554

Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology is a genetics specialist in SAN FRANCISCO, CA specializing in genetics, cardiology (heart disease), general practice and cardiac electrophysiology (heart rhythm). He graduated from George Washington University School of Medicine and Health Sciences. Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology is affiliated with UCSF Health, Hill Physicians and UCSF Cardiovascular Genetics Program.

Office Locations

400 PARNASSUS AVENUE FLOOR 5
SAN FRANCISCO, CA 94143

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535 Mission Bay Boulevard South
San Francisco, CA 94158

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400 Parnassus Avenue Fifth Floor
San Francisco, CA 94143

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Hill Physicians

535 Mission Bay Boulevard
South San Francisco, CA 94143

(415) 353-2873

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In The News (see more mentions in the news)

“This finding is an increasingly common observation, in which the modern-day risk of adverse consequences of atrial fibrillation is (fortunately for our patients) substantially lower than in...”—"Watchman LAA Occluder Bounces Back as Alternative to OAC in CHAMPION-AF", MedPage Today, March 2026

“Gregory Marcus, MD, a cardiac electrophysiologist at the University of California San Francisco, noted that data from patients' various apps and trackers can be difficult to sift through, and...”—"Here's What Doctors Should Know About ChatGPT Health", MedPage Today, January 2026

“Dr. Gregory Marcus, a cardiologist and specialist in the treatment of arrhythmias at the University of California, San Francisco, and a senior author of the study published in the Journal of the...”—"Coffee may prevent heart condition in some patients, study finds", CBS News, November 2025

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

doctor visit	146

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology treated as a genetics specialist in SAN FRANCISCO, CA during 2013 were hospital care and inpatient care.

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

doctor visit	138
hospital care	69
inpatient care	69

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	256
Female	200

**Ethnicity**
Non-Hispanic White	285
Black	46
Hispanic	37
Asian	72
Other	0
Native American	0

**Age**
From 65 to 74	172
From 75 to 84	140
85 and over	62
Less than 65	82

Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology in 2013

Hypertension	75
High Cholesterol	64
Stroke	12
Ischemic Heart Disease	54
Depression	26
Chronic Kidney Disease	44
Asthma	9
Osteoperosis	12
Atrial Fibrilation	44
Heart Failure	43
Chronic Obstructive Pulmonary Disease	18
Diabetes	36
Dementia	11
Cancer	15

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology treated as a genetics specialist in SAN FRANCISCO, CA during 2014 were hospital care and inpatient care.

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

doctor visit	132
hospital care	19
inpatient care	19

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	321
Female	265

**Ethnicity**
Non-Hispanic White	363
Black	44
Hispanic	77
Asian	88
Other	0
Native American	0

**Age**
From 65 to 74	234
From 75 to 84	173
85 and over	64
Less than 65	115

Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology in 2014

Hypertension	75
High Cholesterol	60
Stroke	10
Ischemic Heart Disease	53
Depression	26
Chronic Kidney Disease	44
Asthma	10
Osteoperosis	10
Atrial Fibrilation	38
Heart Failure	43
Chronic Obstructive Pulmonary Disease	17
Diabetes	36
Dementia	14
Cancer	17

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology treated as a genetics specialist in SAN FRANCISCO, CA during 2015 were hospital care and inpatient care.

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

doctor visit	147
hospital care	28
inpatient care	28

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	572
Female	502

**Ethnicity**
Non-Hispanic White	588
Black	130
Hispanic	128
Asian	196
Other	32
Native American	0

**Age**
From 65 to 74	420
From 75 to 84	296
85 and over	160
Less than 65	198

Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology in 2015

Hypertension	75
High Cholesterol	60
Stroke	10
Ischemic Heart Disease	49
Depression	28
Chronic Kidney Disease	49
Asthma	15
Osteoperosis	11
Atrial Fibrilation	38
Heart Failure	40
Chronic Obstructive Pulmonary Disease	17
Diabetes	33
Dementia	13
Cancer	14

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

doctor visit	132

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	257
Female	205

**Ethnicity**
Non-Hispanic White	272
Black	45
Hispanic	45
Asian	77
Other	23
Native American	0

**Age**
From 65 to 74	171
From 75 to 84	139
85 and over	67
Less than 65	85

Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology in 2016

Hypertension	75
High Cholesterol	62
Stroke	9
Ischemic Heart Disease	56
Depression	28
Chronic Kidney Disease	49
Asthma	25
Osteoperosis	12
Atrial Fibrilation	42
Heart Failure	42
Chronic Obstructive Pulmonary Disease	23
Diabetes	35
Dementia	17
Cancer	13

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology treated as a genetics specialist in SAN FRANCISCO, CA during 2017 were hospital care and inpatient care.

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

doctor visit	108
hospital care	11
inpatient care	11

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	245
Female	157

**Ethnicity**
Non-Hispanic White	243
Black	41
Hispanic	37
Asian	65
Other	0
Native American	0

**Age**
From 65 to 74	150
From 75 to 84	133
85 and over	59
Less than 65	60

Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology in 2017

Hypertension	75
High Cholesterol	57
Stroke	8
Ischemic Heart Disease	61
Depression	24
Chronic Kidney Disease	52
Asthma	14
Osteoperosis	9
Atrial Fibrilation	42
Heart Failure	44
Chronic Obstructive Pulmonary Disease	19
Diabetes	39
Dementia	18
Cancer	15

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

doctor visit	107

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	182
Female	134

**Ethnicity**
Non-Hispanic White	190
Black	36
Hispanic	28
Asian	47
Other	0
Native American	0

**Age**
From 65 to 74	124
From 75 to 84	110
85 and over	39
Less than 65	43

Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology in 2018

Hypertension	72
High Cholesterol	53
Stroke	11
Ischemic Heart Disease	54
Depression	26
Chronic Kidney Disease	44
Asthma	13
Osteoperosis	11
Atrial Fibrilation	44
Heart Failure	39
Chronic Obstructive Pulmonary Disease	19
Diabetes	30
Dementia	16
Cancer	14

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

doctor visit	109

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	237
Female	186

**Ethnicity**
Non-Hispanic White	265
Black	30
Hispanic	38
Asian	75
Other	0
Native American	0

**Age**
From 65 to 74	172
From 75 to 84	131
85 and over	65
Less than 65	55

Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology in 2019

Hypertension	73
High Cholesterol	55
Stroke	7
Ischemic Heart Disease	49
Depression	27
Chronic Kidney Disease	46
Asthma	11
Osteoperosis	11
Atrial Fibrilation	41
Heart Failure	36
Chronic Obstructive Pulmonary Disease	17
Diabetes	32
Dementia	16
Cancer	17

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

doctor visit	99

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	286
Female	212

**Ethnicity**
Non-Hispanic White	293
Black	40
Hispanic	42
Asian	97
Other	26
Native American	0

**Age**
From 65 to 74	212
From 75 to 84	161
85 and over	57
Less than 65	68

Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology in 2020

Hypertension	74
High Cholesterol	63
Stroke	11
Ischemic Heart Disease	60
Depression	34
Chronic Kidney Disease	53
Asthma	12
Osteoperosis	12
Atrial Fibrilation	40
Heart Failure	44
Chronic Obstructive Pulmonary Disease	22
Diabetes	38
Dementia	18
Cancer	16

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

doctor visit	128

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	235
Female	209

**Ethnicity**
Non-Hispanic White	257
Black	38
Hispanic	38
Asian	82
Other	0
Native American	0

**Age**
From 65 to 74	177
From 75 to 84	140
85 and over	67
Less than 65	60

Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology in 2021

Hypertension	75
High Cholesterol	63
Stroke	10
Ischemic Heart Disease	52
Depression	32
Chronic Kidney Disease	52
Asthma	15
Osteoperosis	15
Atrial Fibrilation	37
Heart Failure	41
Chronic Obstructive Pulmonary Disease	21
Diabetes	38
Dementia	20
Cancer	16

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology treated as a genetics specialist in SAN FRANCISCO, CA during 2022 were cardioversion.

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

cardioversion	13
doctor visit	151

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	246
Female	236

**Ethnicity**
Non-Hispanic White	293
Black	38
Hispanic	52
Asian	77
Other	22
Native American	0

**Age**
From 65 to 74	177
From 75 to 84	168
85 and over	79
Less than 65	58

Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology in 2022

Hypertension	75
High Cholesterol	74
Stroke	15
Ischemic Heart Disease	44
Depression	29
Chronic Kidney Disease	36
Asthma	16
Osteoperosis	21
Atrial Fibrilation	54
Heart Failure	40
Chronic Obstructive Pulmonary Disease	22
Diabetes	38
Dementia	14
Cancer	21

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology for Medicare patients.

The highest averages for the top procedures that Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology treated as a genetics specialist in SAN FRANCISCO, CA were hospital care, inpatient care and cardioversion.

cardioversion	13
doctor visit	127
hospital care	31
inpatient care	31

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology.

**Gender**
Male	257
Female	209

**Ethnicity**
Black / African American	44
Asian / Pacific Islander	79
Non-Hispanic White	277
Native American / Alaskan Native	0
Hispanic	47
Other	9

**Age**
75 to 84	144
85 and over	65
Less than 65	74
65 to 74	182

Average of Total of Conditions of Medicare patients treated by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology treated were hypertension, high cholesterol, ischemic heart disease and chronic kidney disease.

Hypertension	67
High Cholesterol	55
Stroke	9
Ischemic Heart Disease	48
Depression	25
Chronic Kidney Disease	42
Asthma	12
Osteoporosis	11
Heart Failure	37
Chronic Obstructive Pulmonary Disease	17
Diabetes	32
Atrial Fibrillation	38
Dementia	14
Cancer	14

Education & Training

Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology graduated from George Washington University School of Medicine and Health Sciences. He completed residency at Stanford University Medical Center. He is certified by the American Board of IM/Clinical Cardiac Electrophys, Clinical Cardiac Electrophysiology and has a state license in California.

Medical School: George Washington University School of Medicine and Health Sciences

Residency: Stanford University Medical Center

Board Certification: American Board of IM/Clinical Cardiac Electrophys, Clinical Cardiac Electrophysiology

Licensed In: California

Affiliations & Hospitals

Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology is associated with these hospitals and organizations:

UCSF Health

Hill Physicians

UCSF Cardiovascular Genetics Program

Ratings & Reviews

Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology has an exceptional overall rating with an average of 4.9 out of 5 stars based on 130 ratings. We collect ratings and reviews of Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology from all over the web to help you find the right in SAN FRANCISCO, CA.

4.9

Overall Rating

(130 Ratings)

Leave a Review

Reviews From Around The Web

Overall Rating: 5.0 2025-07-12

Patient verified via Press Ganey

Very good and helpful experience

General Payments

These charts describe general payments received by Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
BIOTRONIK INC.	$7,500 $7,500
Janssen Scientific Affairs, LLC	$7,250 XARELTO $50	$7,200
St. Jude Medical, Inc.	$2,707 Swartz Guiding Introducers $2,101	Ampere RF Ablation Generator $606
AltaThera Pharmaceuticals LLC	$1,000 Sotalol Hydrochloride $1,000
Medtronic Vascular, Inc.	$513 Advisa $162	Visia AF $160	Cardiac Resynchronization Therapy - CRT $121	Azure $65	Reveal LINQ $5
Other	$255 Myrbetriq $102	XARELTO $94	Ultrasound Catheters Accessories $16	$43

**Types of Payments**
Grant	$7,500
Consulting Fee	$7,200
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$2,101
Food and Beverage	$1,328
Honoraria	$1,000
Other	$96

Research Payments

Dr. Gregory Maurice Marcus, MD, Electrophysiology | Cardiology has received 74 research payments totaling $412,995.

Biography

Dr. Gregory Marcus is a specialist in general practice, genetics, and cardiac electrophysiology (heart rhythm). Dr. Marcus's average patient rating is 5.0 stars (out of 5). He is especially interested in atrial flutter, ventricular tachycardia, and atrial fibrillation. He graduated from George Washington University School of Medicine and Health Sciences and then he performed his residency at Stanford University Medical Center. Dr. Marcus is affiliated with UCSF Medical Group, Hill Physicians, and Regents of the University of California. Doctor.com reports that he is accepting new patients at his office in SAN FRANCISCO, CA.