Ahmed Abou-Zamzam, MD
Vascular Surgery · Loma Linda, CANPI 1558306795
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $7,941 of the $9,166 with a category attached, or 86.6%. 25 manufacturers reported payments, led by W. L. Gore & Associates, Inc. at 29.2% of the total. Reporting peaked in 2019 at $2,157 and has fallen 50.1% since, to $1,076 in 2025.
Across 143 payments — averaging $64.10 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- W. L. Gore & Associates, Inc.$3K
- Cook Medical LLC$2K
- Silk Road Medical, Inc.$2K
- Medtronic$2K
- Bolton Medical Inc$359
- Bard Peripheral Vascular, Inc.$256
- plus $1K from 19 others
Across 4 payments — averaging $2772.01 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$11K
What the payments were for
- Travel & lodging$1,22513%
- Food & beverage$7,94187%
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 |
|---|---|---|
| W. L. Gore & Associates, Inc. | 34 | $2,676 |
| Cook Medical LLC | 27 | $1,676 |
| Silk Road Medical, Inc. | 19 | $1,612 |
| Medtronic(2 entities) | 29 | $1,577 |
| Bolton Medical Inc | 6 | $359 |
| Bard Peripheral Vascular, Inc. | 2 | $256 |
| Smith+Nephew | 2 | $156 |
| Endologix LLC | 1 | $155 |
| Shockwave Medical, Inc | 1 | $141 |
| Terumo Medical Corporation | 4 | $100 |
| Imperative Care, Inc | 2 | $46 |
| Veryan Medical Incorporated | 1 | $44 |
| Stryker | 2 | $38 |
| Baxter Healthcare | 2 | $38 |
| Boston Scientific | 1 | $37 |
| Integra Lifesciences Corporation | 1 | $35 |
| Philips North America LLC | 1 | $35 |
| Acera Surgical, Inc. | 1 | $29 |
| Penumbra, Inc. | 1 | $29 |
| Shape Memory Medical Inc. | 1 | $26 |
| Artivion, Inc. | 1 | $22 |
| Angiodynamics, Inc. | 1 | $22 |
| Abbott | 1 | $21 |
| Laminate Medical Technologies Inc. | 1 | $21 |
| Lemaitre Vascular, Inc. | 1 | $14 |
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.
- ENROUTE Transcarotid Neuroprotection System$1,360
- ENROUTE Transcarotid Stent$1,218
- ENHANCE Transcarotid Peripheral Access Kit$847
- TAG Thoracic Endoprosthesis$741
- ENROUTE .014 Guidewire$705
- Cook$478
- Conformable TAG Thoracic Endoprosthesis$411
- ENDURANT IIS$267
- EXCLUDER Iliac Branch Endoprosthesis$245
- GORE TAG Conformable Thoracic Endoprosthesis$190
- GORE VIABAHN VBX Balloon Expandable Endo$166
- Endurant$160
- Ovation iX Iliac Stent Graft$155
- AFX2 Bifurcated Endograft System$155
- Lutonix Drug Coated Balloon$152
- Grafts$149
- ENROUTE Transcarotid Stent System$142
- ENROUTE 0.014 Guidewire$142
- Shockwave IVL System with the Shockwave C2 Coronary IVL Catheter$141
- Cook Medical Thoracic$140
How this compares
$9,166 in reported general payments places this provider in the 65th percentile of 519 vascular 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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| EliquisApixaban | 18 | $19,036 |
| Cilostazol | 62 | $1,644 |
| ClopidogrelClopidogrel Bisulfate | 38 | $414 |
| Atorvastatin Calcium | 29 | $216 |
Paid to pharmacies, not to this prescriber.
Other vascular surgery in Loma Linda
- Theodore TeruyaLoma Linda$43K
- Son DuongFountain Valley$503K
- Venita ChandraPalo Alto$488K
- Sukgu HanLos Angeles$477K
- Leigh Ann ObanionFresno$469K
- Trevor DerderianRancho Mirage$359K
- Karthikeshwar KasirajanPalo Alto$349K
- Johnathon RolloLos Angeles$337K
- Melissa LojaFairfield$272K
- Jason LeePalo Alto$228K
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.