Tianzan Zhou
Neurological Surgery · Torrance, CANPI 1760845044
Payments from drug & device makers
What this record shows
The money is spread across several categories — travel and lodging (55.3%), food and beverage and gifts — rather than concentrated in one kind of arrangement. 17 manufacturers reported payments, led by Penumbra, Inc. at 42.3% of the total. Reporting peaked in 2023 at $4,779 and has fallen 53.8% since, to $2,207 in 2025.
Across 120 payments — averaging $116.36 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Penumbra, Inc.$6K
- Stryker$3K
- Medical Device Business Services, Inc.$2K
- Balt USA, LLC$2K
- Baxter Healthcare$404
- Medtronic$382
- plus $1K from 11 others
What the payments were for
- Travel & lodging$7,71555%
- Food & beverage$6,24445%
- Gifts$40%
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 |
|---|---|---|
| Penumbra, Inc. | 35 | $5,909 |
| Stryker | 26 | $2,822 |
| Medical Device Business Services, Inc. | 12 | $1,753 |
| Balt USA, LLC | 10 | $1,621 |
| Baxter Healthcare | 7 | $404 |
| Medtronic | 7 | $382 |
| Carlsmed, Inc. | 2 | $215 |
| Johnson & Johnson(2 entities) | 6 | $215 |
| Kuros Biosciences USA, Inc | 2 | $157 |
| Imperative Care, Inc | 2 | $154 |
| Globus Medical(2 entities) | 4 | $94 |
| UCB, Inc. | 2 | $77 |
| Aesculap Implant Systems, LLC | 1 | $55 |
| Integra Lifesciences Corporation | 1 | $43 |
| Microvention, Inc. | 1 | $22 |
| Teva Pharmaceuticals USA, Inc. | 1 | $21 |
| SK Life Science, Inc. | 1 | $18 |
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.
- Penumbra System$4,882
- Optima Coil System$1,944
- Pulsar Vascular PulseRider Aneurysm Neck Reconstruction Device$1,612
- TRUFILL$1,612
- TREVO$788
- TARGET$785
- EVOLVE$481
- RED 72$250
- Carrier Delivery Catheter$249
- Raptor Aspiration Catheter$249
- Prestige Coil System$249
- CAPRI CORPECTOMY CAGE SYSTEM$164
- NEUROFORM EZ 3$145
- Penumbra Coil 400$134
- ZOOM 88-T LARGE DISTAL PLATFORM$133
- SURPASS EVOLVE$125
- aprevo$123
- MAZOR X SYSTEM$123
- Embotrap$107
- FLOSEAL$104
How this compares
$13,964 in reported general payments places this provider in the 65th percentile of 773 neurological surgery providers in California.
Other neurological surgery in Torrance
- Christopher AmesSan Francisco$7.1M
- Larry KhooLos Angeles$2.8M
- Samy AbdouSan Diego$2.4M
- Bret AbshireMurrieta$2.3M
- William TaylorSan Diego$2.1M
- Tooraj GravoriEncino$2M
- Ali MesiwalaRancho Cucamonga$1.5M
- Joseph OsorioSan Diego$1.3M
- Ian JohnsonFresno$1.3M
- Aaron Cohen-GadolLos Angeles$1.3M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.