Nathan Hammel, MD
Orthopaedic Surgery · Encinitas, CANPI 1558435644
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 53 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 14 manufacturers reported payments, led by Stryker at 51.4% of the total. Reporting peaked in 2023 at $367 and has fallen 89.9% since, to $37 in 2025. That places this record below the midpoint for orthopaedic surgery clinicians in CA, where the typical reported total is $2,444.
Across 53 payments — averaging $23.52 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Stryker$640
- Lima USA, Inc.$146
- Onkos Surgical, Inc.$135
- Next Science LLC$81
- Johnson & Johnson$48
- Bioventus LLC$47
- plus $149 from 8 others
Across 1 payment — averaging $33,348 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.
- American Regent$33K
What the payments were for
- Food & beverage$1,247100%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| Stryker | 35 | $640 |
| Lima USA, Inc. | 1 | $146 |
| Onkos Surgical, Inc. | 1 | $135 |
| Next Science LLC | 2 | $81 |
| Johnson & Johnson | 4 | $48 |
| Bioventus LLC | 2 | $47 |
| Pacira Therapeutics, Inc. | 1 | $27 |
| Acumed LLC | 1 | $23 |
| Encore Medical, LP | 1 | $19 |
| Zimmer Biomet | 1 | $19 |
| Endo Pharmaceuticals Inc. | 1 | $17 |
| Sanofi-aventis U.S. LLC | 1 | $16 |
| Fidia Pharma USA Inc. | 1 | $14 |
| Innovation Technologies Inc | 1 | $13 |
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.
- MAKO$211
- LANTERN SURGICAL ASSISTANT$146
How this compares
$1,247 in reported general payments places this provider in the 40th percentile of 1,808 orthopaedic 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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Celecoxib | 14 | $702 |
Paid to pharmacies, not to this prescriber.
Other orthopaedic surgery in Encinitas
- Bradford HackArcadia$18.3M
- Robert GorabOrange$13.6M
- Kelly VinceLos Angeles$9.6M
- Stephen HowellSacramento$9.4M
- Thomas CoonRed Bluff$9.2M
- Nirav AminPlacentia$5.6M
- Tom NorrisSan Francisco$5.3M
- Jay LiebermanLos Angeles$4.8M
- Peter NewtonSan Diego$4.2M
- Sigurd BervenSan Francisco$4.1M
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.