William Knudson, DPM
Foot & Ankle Surgery · Leesburg, VANPI 1083608814
Payments from drug & device makers
What this record shows
The money is spread across several categories — food and beverage (47.5%), education and travel and lodging — rather than concentrated in one kind of arrangement. 32 manufacturers reported payments, led by Supreme Orthopedic Systems, LLC at 27.8% of the total. Reporting peaked in 2022 at $3,484 and has fallen 90.7% since, to $326 in 2025.
Across 126 payments — averaging $43.82 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Supreme Orthopedic Systems, LLC$2K
- Arthrex$1K
- Smith+Nephew$701
- ANI Pharmaceuticals, Inc.$364
- Organogenesis Inc.$177
- Integra Lifesciences Corporation$160
- plus $1K from 26 others
What the payments were for
- Travel & lodging$4989%
- Food & beverage$2,62448%
- Education$2,40043%
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 |
|---|---|---|
| Supreme Orthopedic Systems, LLC | 4 | $1,535 |
| Arthrex | 5 | $1,456 |
| Smith+Nephew | 19 | $701 |
| ANI Pharmaceuticals, Inc. | 27 | $364 |
| Organogenesis Inc. | 6 | $177 |
| Integra Lifesciences Corporation | 8 | $160 |
| Cardiovascular Systems Inc. | 1 | $141 |
| Amgen(2 entities) | 8 | $135 |
| Averitas Pharma Inc. | 6 | $131 |
| Stryker(2 entities) | 4 | $68 |
| Kowa Pharmaceuticals America, Inc. | 4 | $64 |
| Fidia Pharma USA Inc. | 3 | $63 |
| Osteomed LLC | 2 | $62 |
| Heron Therapeutics, Inc. | 4 | $47 |
| Zimmer Biomet | 2 | $44 |
| Alfasigma USA, Inc. | 2 | $40 |
| Medtronic | 2 | $40 |
| Bioventus LLC | 2 | $39 |
| Merck | 2 | $32 |
| Convatec Inc. | 2 | $30 |
| Linvatec Corporation | 1 | $25 |
| Triad Life Sciences Inc. | 2 | $25 |
| Pfizer | 1 | $23 |
| Paratek Pharmaceuticals, Inc. | 1 | $17 |
| Johnson & Johnson | 1 | $17 |
| Arthrosurface Incorporated | 1 | $16 |
| Ortho Dermatologics, A Division Of Bausch Health US, LLC | 1 | $15 |
| Hikma Pharmaceuticals USA | 1 | $13 |
| Paragon 28, Inc. | 1 | $11 |
| KCI USA, Inc. | 1 | $11 |
| Musculoskeletal Transplant Foundation Inc. | 1 | $10 |
| Orthofix Medical, Inc. | 1 | $10 |
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.
- Diamondback Peripheral$141
- Grafix$123
- COLLAGENASE SANTYL$110
How this compares
$5,522 in reported general payments places this provider in the 60th percentile of 260 foot & ankle surgery providers in Virginia.
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 |
|---|---|---|
| Gabapentin | 117 | $1,167 |
| Duloxetine Hcl | 30 | $871 |
| Cefdinir | 41 | $563 |
| Pregabalin | 36 | $467 |
| Terbinafine Hcl | 34 | $467 |
| Allopurinol | 40 | $347 |
| Celecoxib | 20 | $347 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 22 | $232 |
| Methylprednisolone | 17 | $138 |
| Oxycodone-AcetaminophenOxycodone Hcl/Acetaminophen | 16 | $125 |
| Prednisone | 43 | $99 |
| Meloxicam | 33 | $89 |
| Ciprofloxacin Hcl | 12 | $80 |
Paid to pharmacies, not to this prescriber.
Other foot & ankle surgery in Leesburg
- Mark JonesNorth Chesterfield$2.4M
- Oliver SchipperArlington$1.2M
- Steven NeufeldFalls Church$857K
- Charles ZelenRoanoke$363K
- Ryan VazalesGlen Allen$337K
- Jugal DhariaFairfax$309K
- William SimonVirginia Beach$292K
- William GrantVirginia Beach$271K
- Bradley LevittVirginia Beach$243K
- Richard DernerLake Ridge$212K
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.