Mark Nathan
Interventional Cardiology · Walnut Creek, CANPI 1013947670
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $127,709 of the $158,245 with a category attached, or 80.7%. 15 manufacturers reported payments, led by Boehringer Ingelheim at 52.1% of the total. Reporting peaked in 2019 at $96,587 and has fallen 60.1% since, to $38,528 in 2021. Among interventional cardiology clinicians in CA with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 214 payments — averaging $739.46 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Boehringer Ingelheim$83K
- Lilly USA, LLC$39K
- Astellas Pharma US Inc$20K
- Amgen$7K
- AstraZeneca$7K
- ZOLL Services LLC (a/k/a ZOLL Lifecor Corp)$2K
- plus $2K from 9 others
Across 4 payments — averaging $3806.50 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.
- Boehringer Ingelheim International GmbH$9K
- Sanofi US Services Inc.$5K
- Amarin Pharma, Inc.$2K
What the payments were for
- Consulting fees$5,4003%
- Speaking & faculty fees$127,70981%
- Travel & lodging$20,03913%
- Food & beverage$4,9873%
- Education$1100%
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 |
|---|---|---|
| Boehringer Ingelheim | 85 | $82,521 |
| Lilly USA, LLC | 65 | $39,108 |
| Astellas Pharma US Inc | 15 | $19,968 |
| Amgen | 7 | $6,785 |
| AstraZeneca | 12 | $6,622 |
| ZOLL Services LLC (a/k/a ZOLL Lifecor Corp) | 5 | $1,648 |
| Medtronic | 6 | $819 |
| Pfizer | 9 | $351 |
| Heartflow, Inc. | 3 | $163 |
| Portola Pharmaceuticals, LLC | 1 | $132 |
| Biotronik Inc. | 1 | $39 |
| Johnson & Johnson | 2 | $39 |
| Merck | 1 | $22 |
| Terumo Medical Corporation | 1 | $15 |
| Boston Scientific | 1 | $13 |
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.
How this compares
$158,245 in reported general payments places this provider in the 90th percentile of 585 interventional cardiology providers in California.
Other interventional cardiology in Walnut Creek
- Richard ChangWalnut Creek$132K
- Andrew BennWalnut Creek$122K
- Matthew Pricela Jolla$2.3M
- Frederick St GoarMountain View$2.2M
- Saibal KarThousand Oaks$1.1M
- Rahul SharmaStanford$1M
- Puneet KhannaRancho Mirage$1M
- Dennis SheehanRedwood City$900K
- Suhail DohadBeverly Hills$802K
- Curtiss Stinisla Jolla$759K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.