Ahmed Mahmoud, MD
Thoracic Surgery (Cardiothoracic Vascular Surgery) · Riverside, CANPI 1114940038
Payments from drug & device makers
What this record shows
The money is spread across several categories — education (53.1%), travel and lodging and food and beverage — rather than concentrated in one kind of arrangement. Intuitive Surgical accounts for 63.2% of it on its own, with 16 other manufacturers making up the rest. Reporting peaked in 2023 at $9,420 and has fallen 97.4% since, to $244 in 2025.
Across 72 payments — averaging $248.31 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Intuitive Surgical$11K
- W. L. Gore & Associates, Inc.$3K
- Integra Lifesciences Corporation$2K
- TELA Bio, Inc.$267
- Aroa Biosurgery Incorporated$244
- Atricure, Inc.$141
- plus $476 from 11 others
What the payments were for
- Travel & lodging$5,55931%
- Food & beverage$2,81916%
- Education$9,50053%
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 |
|---|---|---|
| Intuitive Surgical | 17 | $11,301 |
| W. L. Gore & Associates, Inc. | 16 | $3,198 |
| Integra Lifesciences Corporation | 14 | $2,251 |
| TELA Bio, Inc. | 2 | $267 |
| Aroa Biosurgery Incorporated | 3 | $244 |
| Atricure, Inc. | 2 | $141 |
| Johnson & Johnson | 5 | $123 |
| Baxter Healthcare | 2 | $105 |
| Acell, Inc. | 2 | $84 |
| Novo Nordisk | 2 | $29 |
| Davol Inc. | 1 | $23 |
| Abbott | 1 | $22 |
| Edwards Lifesciences | 1 | $22 |
| Silk Road Medical, Inc. | 1 | $21 |
| Merck | 1 | $16 |
| E.r. Squibb & Sons, L.L.C. | 1 | $15 |
| Stryker | 1 | $15 |
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.
- DAVINCI XI$9,500
- INTEGRA$2,683
- EXCLUDER AAA Endoprosthesis$2,268
- Da Vinci Surgical System$1,728
- PRIMATRIX$589
- SURGIMEND$576
- GORE VIABAHN Endoprosthesis$541
- TCC-EZ$440
- NEURAGEN$440
- MICROMATRIX$440
- CYTAL$297
- INTEGRA DERMAL REGENERATION TEMPLATE$288
- Ovitex$148
- OMNIGRAFT$139
- ATRICURE CRYOICE CRYOSPHERE CRYOABLATION SYSTEM$125
- OviTex Reinforced Bioscaffold With Permanent Polymer (OviTex)$119
How this compares
$17,878 in reported general payments places this provider in the 75th percentile of 546 thoracic surgery (cardiothoracic vascular surgery) providers in California.
See all thoracic surgery (cardiothoracic 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.
Other thoracic surgery (cardiothoracic vascular surgery) in Riverside
- Samer KanaanRiverside$268K
- Thomas FogartyPortola Valley$3.7M
- Steven GundryPalm Springs$1.6M
- Armin KiankhooySaint Helena$941K
- Ara KlijianMurrieta$916K
- Gregory FontanaThousand Oaks$875K
- Gansevoort DunningtonSaint Helena$764K
- Wilson TsaiWalnut Creek$680K
- Fernando FleischmanLos Angeles$608K
- Harmik SoukiasianLos Angeles$577K
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.