Thomas Chang
Foot & Ankle Surgery · Santa Rosa, CANPI 1841315736
Payments from drug & device makers
Across 465 payments — averaging $4538.49 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Paragon 28, Inc.$1.2M
- Depuy Synthes Products, Inc.$599K
- Ossio Inc$91K
- Ossio LTD$80K
- Stryker$53K
- Bioventus LLC$40K
- plus $77K from 30 others
Across 9 payments — averaging $1028.69 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.
- Paragon 28, Inc.$9K
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 |
|---|---|---|
| Paragon 28, Inc. | 158 | $1,171,724 |
| Depuy Synthes Products, Inc. | 23 | $598,733 |
| Ossio Inc | 33 | $90,508 |
| Ossio LTD | 5 | $80,000 |
| Stryker(2 entities) | 61 | $52,814 |
| Bioventus LLC | 42 | $39,600 |
| Crossroads Extremity Systems, LLC | 30 | $27,007 |
| Johnson & Johnson(2 entities) | 25 | $23,449 |
| Medical Device Business Services, Inc. | 21 | $19,599 |
| Musculoskeletal Transplant Foundation Inc. | 11 | $1,438 |
| Evolution Surgical, Inc | 5 | $1,334 |
| Activortho, Inc. | 1 | $550 |
| Treace Medical Concepts, Inc. | 4 | $497 |
| Abbott | 3 | $363 |
| Zimmer Biomet | 8 | $281 |
| International Life Sciences | 1 | $268 |
| Osiris Therapeutics Inc. | 2 | $239 |
| Smith+Nephew | 4 | $231 |
| Nevro Corp. | 2 | $201 |
| Alafair Biosciences, Inc. | 2 | $177 |
| Integra Lifesciences Corporation | 3 | $169 |
| Mimedx Group, Inc. | 3 | $169 |
| Tactile Systems Technology Inc | 1 | $157 |
| Encore Medical, LP | 1 | $144 |
| Derma Sciences, Inc. | 4 | $118 |
| Carbofix Orthopedics Inc | 1 | $111 |
| Melinta Therapeutics, LLC | 1 | $108 |
| Lifenet Health | 1 | $101 |
| Trimed, Inc. | 1 | $84 |
| Axogen | 1 | $69 |
| Convatec Inc. | 2 | $31 |
| Vertex | 1 | $30 |
| Orthofix Medical, Inc. | 1 | $29 |
| Organogenesis Inc. | 1 | $24 |
| Curonix LLC | 1 | $24 |
| Electronic Waveform Lab, Inc. | 1 | $19 |
How this compares
$2,110,400 in reported general payments places this provider in the 95th percentile of 1,126 foot & ankle 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 foot & ankle surgery in Santa Rosa
- Walter D CostaSanta Rosa$37K
- John ZimmermanBakersfield$4.6M
- Eric GizaSacramento$3.7M
- Thomas HarrisPasadena$3M
- Felix SigalLos Angeles$2.2M
- Michael CoughlinSan Francisco$1.6M
- Vladimir ZeetserEncino$677K
- Jason NowakRedding$526K
- Candice BradyCamarillo$462K
- Andrew HsuOrange$456K
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.