Physician Profile
Unclaimed ProfileAbout MARCUS
Gregory Maurice Marcus, MD is a healthcare provider in San Francisco, CA specialising in cardiovascular disease (cardiology). Gregory trained at George Washington University School of Medicine, graduating in 1998. Gregory is also listed as specialising in internal medicine, cardiovascular disease, and clinical cardiac electrophysiology.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Marcus specialise in?
Dr. Marcus is a cardiovascular disease (cardiology) in San Francisco, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “CARDIOVASCULAR DISEASE (CARDIOLOGY)”.
NPI registry
Where is Dr. Marcus located?
Dr. Marcus is listed at 505 PARNASSUS AVE, San Francisco, CA 94143. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Marcus's phone number?
The number on file is (415) 353-8870. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Marcus?
Dr. Marcus's National Provider Identifier is 1891720579. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Marcus go to medical school?
Dr. Marcus attended George Washington University School of Medicine, graduating in 1998. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Marcus have?
Dr. Marcus has 28 years experience. Calculated from a graduation year of 1998, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Marcus do most often?
According to Medicare billing data, Dr. Marcus provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report only and evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Marcus's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Marcus. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (415) 353-8870
- Email not available
Practice Locations
505 PARNASSUS AVE
San Francisco, CA 94143
Procedures Most Often Billed to Medicare
1,354 services · 894 patients · 11 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | Treatment | 93010 |
595 |
| Evaluation of single, dual, multiple lead or leadless pacemaker system, remote up to 90 days | Treatment | 93294 |
213 |
| Evaluation of single, dual, or multiple lead implantable defibrillator system, remote up to 90 days | Treatment | 93295 |
79 |
| Programming of dual lead pacemaker system | Treatment | 93280 |
45 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | Treatment | 93010 |
29 |
| Comprehensive electrophysiologic evaluation with catheter destruction of abnormality causing atrial fibrillation (uncoordinated contraction of upper chambers of heart) by pulmonary vein isolation | Treatment | 93656 |
16 |
| External shock to heart to regulate heart beat | Treatment | 92960 |
16 |
| Evaluation of single, dual, multiple lead or leadless pacemaker system | Treatment | 93288 |
13 |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
156 |
| Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient' | Billing code | G2211 |
150 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other cardiovascular diseases in San Francisco 8
Same specialty, same city.
Trained at George Washington University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1998 at George Washington University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 8
Providers in CA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.