Stefan Ruehm, MD
Internal Medicine · Los Angeles, CANPI 1669416632
Payments from drug & device makers
What this record shows
Heartflow, Inc. accounts for 97.8% of it on its own, with 1 other manufacturer making up the rest. 2025 is the largest year on record at $1,509, more than ten times the $50 reported in 2019.
Across 17 payments — averaging $131.62 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Heartflow, Inc.$2K
- Bracco Diagnostics Inc.$50
Across 9 payments — averaging $613.37 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.
- Siemens Medical Solutions USA, Inc.$5K
- GE HealthCare$162
- Guerbet LLC$137
What the payments were for
- Travel & lodging$94742%
- Food & beverage$1,29058%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| Heartflow, Inc. | 16 | $2,188 |
| Bracco Diagnostics Inc. | 1 | $50 |
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.
- FFRct$1,901
How this compares
$2,237 in reported general payments places this provider in the 85th percentile of 13,581 internal medicine 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.
Other internal medicine in Los Angeles
- William HardyLos Angeles$704K
- Soha DolatabadiLos Angeles$458K
- Matthew HerrmannLos Angeles$384K
- Koppany VisnyeiLos Angeles$287K
- Jaime BetancourtLos Angeles$286K
- William KingLos Angeles$227K
- Andrew ChengSouth San Francisco$55.1M
- Tung NgoNewport Beach$4.9M
- Christian EversullStanford$2.9M
- Christian SandrockSacramento$2.1M
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.