Gregory Walker, MD
Foot and Ankle Surgery · Tucson, AZNPI 1801250659
Payments from drug & device makers
What this record shows
The money is spread across several categories — grants (54.2%), education and food and beverage — rather than concentrated in one kind of arrangement. Arthrex accounts for 75.7% of it on its own, with 18 other manufacturers making up the rest. Reporting peaked in 2022 at $16,755 and has fallen 97.4% since, to $442 in 2025.
Across 108 payments — averaging $170.84 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Arthrex$14K
- Stryker$2K
- Sequoia Surgical, Inc.$1K
- Orthofix Medical, Inc.$383
- Impactortho, Inc.$212
- Musculoskeletal Transplant Foundation Inc.$177
- plus $902 from 13 others
What the payments were for
- Grants$10,00054%
- Travel & lodging$1,78410%
- Food & beverage$3,06717%
- Education$3,60020%
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 |
|---|---|---|
| Arthrex | 17 | $13,975 |
| Stryker | 18 | $1,601 |
| Sequoia Surgical, Inc. | 1 | $1,200 |
| Orthofix Medical, Inc. | 37 | $383 |
| Impactortho, Inc. | 6 | $212 |
| Musculoskeletal Transplant Foundation Inc. | 2 | $177 |
| Smith+Nephew | 6 | $169 |
| Paragon 28, Inc. | 3 | $119 |
| Johnson & Johnson | 2 | $107 |
| DJO, LLC | 3 | $97 |
| Alafair Biosciences, Inc. | 2 | $76 |
| Amgen | 2 | $76 |
| Curonix LLC | 1 | $58 |
| Integra Lifesciences Corporation | 1 | $48 |
| Bioventus LLC | 2 | $46 |
| Treace Medical Concepts, Inc. | 2 | $38 |
| Restor3d, Inc. | 1 | $31 |
| Mimedx Group, Inc. | 1 | $23 |
| Acera Surgical, 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.
- SALVATION$568
- PROPHECY$288
- AUGMENT INJECTABLE$164
- ORTHOLOC 3DI$122
- 7 X 23MM CITRELOCK IMPLANT$122
How this compares
$18,451 in reported general payments places this provider in the 85th percentile of 291 foot and ankle surgery providers in Arizona.
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 | 69 | $441 |
| Celecoxib | 12 | $262 |
| Oxycodone Hcl | 53 | $237 |
| Ondansetron Hcl | 35 | $212 |
| Sulfamethoxazole-TrimethoprimSulfamethoxazole/Trimethoprim | 24 | $209 |
| Tramadol Hcl | 27 | $123 |
| Methylprednisolone | 17 | $118 |
| Doxycycline Hyclate | 12 | $94 |
| Meloxicam | 42 | $43 |
Paid to pharmacies, not to this prescriber.
Other foot and ankle surgery in Tucson
- Geoffrey LandisTucson$307K
- Bryan HallTucson$74K
- Jerome SteckTucson$64K
- Joseph BakerTucson$35K
- George AbdelmessiehTucson$25K
- Mohanad EltahirTucson$24K
- David HatchTucson$19K
- Jordan CraftonTucson$17K
- Richard QuintTucson$17K
- Grant SchindlerTucson$13K
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.