Jennifer van Warmerdam, MD
Orthopaedic Surgery · San Francisco, CANPI 1922232404
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 5 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 4 manufacturers reported payments, led by Stryker at 39.4% of the total. That places this record below the midpoint for orthopaedic surgery clinicians in CA, where the typical reported total is $2,444.
Across 5 payments — averaging $22.29 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Stryker$44
- Medical Device Business Services, Inc.$31
- Smith+Nephew$19
- Bioventus LLC$17
What the payments were for
- Food & beverage$111100%
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 |
|---|---|---|
| Stryker | 1 | $44 |
| Medical Device Business Services, Inc. | 2 | $31 |
| Smith+Nephew | 1 | $19 |
| Bioventus LLC | 1 | $17 |
How this compares
$111 in reported general payments places this provider in the 10th percentile of 1,808 orthopaedic surgery 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 orthopaedic surgery in San Francisco
- Tom NorrisSan Francisco$5.3M
- Sigurd BervenSan Francisco$4.1M
- Vedat DevirenSan Francisco$2.9M
- Eugene WolfSan Francisco$988K
- James KellySan Francisco$826K
- Alexander TheologisSan Francisco$719K
- Utku KandemirSan Francisco$484K
- Bradford HackArcadia$18.3M
- Robert GorabOrange$13.6M
- Kelly VinceLos Angeles$9.6M
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.