Gregory Marcus, MD
Clinical Cardiac Electrophysiology · San Francisco, CANPI 1891720579
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $12,200 of the $13,662 with a category attached, or 89.3%. 5 manufacturers reported payments, led by Janssen Scientific Affairs, LLC at 53.1% of the total. Reporting peaked in 2020 at $5,100 and has fallen 98.1% since, to $98 in 2025. That places this record below the midpoint for clinical cardiac electrophysiology clinicians in CA, where the typical reported total is $26,911.
Across 12 payments — averaging $1138.49 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Janssen Scientific Affairs, LLC$7K
- Irhythm Technologies, Inc.$5K
- Altathera Pharmaceuticals LLC$1K
- Medtronic$262
- Abbott$150
Across 32 payments — averaging $2746.92 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Medtronic$48K
- Irhythm Technologies, Inc.$35K
- Dexcom, Inc.$4K
What the payments were for
- Consulting fees$12,20089%
- Speaking & faculty fees$1,0007%
- Food & beverage$4623%
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Janssen Scientific Affairs, LLC | 7 | $7,250 |
| Irhythm Technologies, Inc. | 1 | $5,000 |
| Altathera Pharmaceuticals LLC | 1 | $1,000 |
| Medtronic | 2 | $262 |
| Abbott | 1 | $150 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
- ZIO Patch$5,000
- Sotalol Hydrochloride$1,000
- AURORA EV-ICD MRI SURESCAN$164
- ENSITE PRECISION$150
How this compares
$13,662 in reported general payments places this provider in the 30th percentile of 290 clinical cardiac electrophysiology providers in California.
See all clinical cardiac electrophysiology providers in California →
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| EliquisApixaban | 45 | $63,261 |
| Dofetilide | 12 | $888 |
| Metoprolol Succinate | 41 | $663 |
| Flecainide Acetate | 20 | $635 |
| Diltiazem 24hr Er (Cd)Diltiazem Hcl | 14 | $377 |
| Amiodarone Hcl | 12 | $211 |
Paid to pharmacies, not to this prescriber.
Other clinical cardiac electrophysiology in San Francisco
- Daniel MorinSan Francisco$265K
- Henry HsiaSan Francisco$231K
- Edward GerstenfeldSan Francisco$211K
- Randall LeeSan Francisco$174K
- Joshua MossSan Francisco$138K
- Shephal DoshiSanta Monica$2.1M
- Jonathan HsuSan Diego$1.2M
- Leslie SaxonLos Angeles$1.1M
- Rahul BhardwajLoma Linda$935K
- Nicholas Olsonla Jolla$801K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.