Asterios Tsimpas, MD
Neurological Surgery · Mission Viejo, CANPI 1093919946
Payments from drug & device makers
What this record shows
The money is spread across several categories — consulting fees (37.8%), speaking fees and food and beverage — rather than concentrated in one kind of arrangement. Medtronic accounts for 61.4% of it on its own, with 27 other manufacturers making up the rest. Reporting peaked in 2024 at $13,691 and has fallen 60.7% since, to $5,386 in 2025.
Across 154 payments — averaging $212.39 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$20K
- Novocure Inc.$5K
- Exeltis, USA Inc.$1K
- Stryker$1K
- Globus Medical$834
- BD$768
- plus $3K from 22 others
What the payments were for
- Consulting fees$12,36638%
- Speaking & faculty fees$12,09537%
- Travel & lodging$2,2697%
- Food & beverage$5,76218%
- Education$2161%
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 |
|---|---|---|
| Medtronic(2 entities) | 49 | $20,088 |
| Novocure Inc. | 8 | $4,899 |
| Exeltis, USA Inc. | 1 | $1,440 |
| Stryker | 18 | $1,257 |
| Globus Medical(2 entities) | 16 | $834 |
| BD | 1 | $768 |
| Si-bone, Inc. | 11 | $726 |
| Axogen | 2 | $609 |
| Microvention, Inc. | 10 | $499 |
| Imperative Care, Inc | 9 | $376 |
| Zimmer Biomet | 1 | $199 |
| Intrinsic Therapeutics | 2 | $169 |
| Johnson & Johnson | 2 | $152 |
| Balt USA, LLC | 2 | $135 |
| AbbVie | 6 | $109 |
| Cardiva Medical, Inc. | 3 | $79 |
| Neo Spine USA, Inc. | 1 | $69 |
| Nevro Corp. | 1 | $49 |
| Route 92 Medical, Inc. | 1 | $48 |
| Integra Lifesciences Corporation | 2 | $39 |
| Bioventus LLC | 1 | $38 |
| GT Medical Technologies, Inc | 1 | $25 |
| Medexus Pharma, Inc. | 1 | $21 |
| Abbott | 1 | $19 |
| Boston Scientific | 1 | $18 |
| Trevena, Inc. | 1 | $17 |
| Monteris Medical Corporation | 1 | $14 |
| Kls-martin L.p. | 1 | $12 |
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.
- Oncology$4,786
- ONYX 18$3,698
- Slynd$1,440
- Pipeline$868
- INTELLIS ADAPTIVESTIM$761
- AxoGuard Nerve Protector$596
- AxoGuard Nerve Connector$596
- XIA$500
- AERO$500
- SERRATO$500
- TRITANIUM$500
- ARIA$500
- iFuse Implant$449
- Rist-5F$297
- XLIF$281
- Axium$209
- Mobi-C$199
- TARGET$172
- WEB$138
- Sofia$123
How this compares
$32,708 in reported general payments places this provider in the 75th percentile of 773 neurological 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 |
|---|---|---|
| Prasugrel Hcl | 19 | $533 |
Paid to pharmacies, not to this prescriber.
Other neurological surgery in Mission Viejo
- Alexander TaghvaMission Viejo$345K
- 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
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.