Physician profile
William Knopf
NPI 1922007541
$42,514.53
in general payments reported to CMS, 2019-2025
29 companies · $679 in 2025
The $679 reported for 2025 was more than what a typical Cardiovascular Disease provider received nationally (typical 2025 total: $433).
Payments by year
General payments by program year, as reported to CMS.
General payments by year: 2019: $239 · 2020: $40K · 2021: $294 · 2022: $275 · 2023: $360 · 2024: $347 · 2025: $679.
What the payments were for
Nature of payment as categorized by the reporting companies: meals, consulting, travel, and so on.
Food and Beverage: $1,386.
View as a table
| Payment type | Amount (2023-2025) |
|---|---|
| Food and Beverage | $1,386.40 |
Payment-type detail covers 2023-2025; earlier years are included in totals but not broken out here.
Who reported paying
General payments only, as reported to CMS. Product names cover 2023-2025.
| Company | General payments | Years | Top products |
|---|---|---|---|
| Semler Scientific, INC. | $40,000.00 | 2020 | |
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $773.81 | 2019-2025 | Lifevest |
| Novartis Pharmaceuticals Corporation | $300.40 | 2019-2025 | |
| Abbott Laboratories | $162.73 | 2019-2023 | Thoratec Heartmate 3 Lvas Implant Kit |
| Shockwave Medical, INC | $149.81 | 2025 | |
| Boston Scientific Corporation | $125.31 | 2019-2025 | Lux-Dx Insertable Cardiac Monitor, Watchman Access System, Latitude Communicator Power Supply |
| Astrazeneca Pharmaceuticals LP | $124.05 | 2019-2023 | Farxiga |
| Inspire Medical Systems, INC. | $111.44 | 2025 | Inspire |
| Pfizer INC. | $101.69 | 2022-2025 | |
| Philips North America LLC | $88.29 | 2020-2024 | (Ck4) Mcot |
| E.R. Squibb & Sons, L.L.C. | $75.55 | 2023-2025 | Camzyos, Eliquis |
| Janssen Pharmaceuticals, INC | $65.68 | 2019-2020 | |
| Medtronic, INC. | $63.61 | 2021-2025 | Venaseal |
| Kestra Medical Technology Services, INC. | $56.40 | 2025 | Assure Wcd |
| Cvrx, INC. | $46.67 | 2023-2024 | Barostim Neo System |
Show all 29 companies
| Company | General payments | Years | Top products |
|---|---|---|---|
| Chiesi USA, INC. | $35.81 | 2019-2024 | Cleviprex |
| Vital Connect, INC | $30.13 | 2024 | Vitalpatch Rtm |
| Novo Nordisk INC | $23.49 | 2025 | Wegovy |
| Inari Medical, INC. | $22.98 | 2024 | Ct Thrombectomy System Kit, Flowtriever Catheter, S |
| Boehringer Ingelheim Pharmaceuticals, INC. | $22.92 | 2022 | |
| Merck Sharp & Dohme LLC | $21.13 | 2021 | |
| Esperion Therapeutics, INC. | $18.34 | 2023 | Nexletol |
| G Medical Diagnostic Services, INC. | $16.26 | 2020 | |
| Amarin Pharma, INC. | $14.60 | 2019 | |
| Edwards Lifesciences Corporation | $13.98 | 2019 | |
| Medtronic Vascular, INC. | $13.48 | 2019 | |
| Amgen INC. | $12.54 | 2019 | |
| Astellas Pharma US INC | $12.32 | 2022 | |
| Cardiovascular Systems INC. | $11.11 | 2021 |
Drugs and devices associated with these payments
CMS records which products a payment was associated with, not how the money was allocated. Association is not allocation: one payment can be associated with several products, and a product listing does not mean the payment was made because of that product. Product detail covers 2023-2025.
If you want to bring it up
Most clinicians are glad to talk about this. A respectful way in:
- "I saw William Knopf listed in the CMS Open Payments database. Can you tell me about your work with those companies?"
- "Is there a generic or alternative to this medication, and would it work as well for me?"
- "What made you choose this particular treatment for my situation?"
These are normal questions. A good clinician will welcome them.
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Source: CMS Open Payments, program years 2019-2025, as reported to CMS by drug and device makers (published June 30, 2026). Drug and device detail covers 2023-2025.