Aaron Cohen-Gadol, MD
Neurological Surgery · Los Angeles, CANPI 1215962279
Payments from drug & device makers
What this record shows
This record is dominated by royalties or licence payments: $1,129,977 of the $1,262,028 with a category attached, or 89.5%. Kirwan Surgical Products LLC accounts for 88.6% of it on its own, with 8 other manufacturers making up the rest. Among neurological surgery clinicians in CA with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 42 payments — averaging $30,048 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Kirwan Surgical Products LLC$1.1M
- American Surgical Company, LLC$92K
- Carl Zeiss Meditec, Inc.$32K
- Mizuho America, Inc.$7K
- Medtronic$6K
- Carl Zeiss Meditec USA, Inc.$5K
- plus $2K from 3 others
Across 4 payments — averaging $2315.61 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.
- Seqirus USA Inc$9K
What the payments were for
- Royalty or licence$1,129,97790%
- Consulting fees$110,5669%
- Speaking & faculty fees$8,4201%
- Food & beverage$5460%
- Education$200%
- Charitable contribution$12,5001%
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 |
|---|---|---|
| Kirwan Surgical Products LLC | 10 | $1,118,359 |
| American Surgical Company, LLC | 9 | $92,046 |
| Carl Zeiss Meditec, Inc. | 3 | $31,500 |
| Mizuho America, Inc. | 6 | $6,637 |
| Medtronic | 10 | $6,442 |
| Carl Zeiss Meditec USA, Inc. | 1 | $5,000 |
| Carl Zeiss Meditec AG | 1 | $2,000 |
| Abbott | 1 | $24 |
| CSL Behring | 1 | $20 |
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.
- Cohen Bipolar Forceps$537,245
- Comfort Grip Bipolar Forceps$190,886
- Cohen Forceps$136,481
- KINEVO$29,000
- KINEVO 900$2,000
How this compares
$1,262,028 in reported general payments places this provider in the 95th 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.
Other neurological surgery in Los Angeles
- Larry KhooLos Angeles$2.8M
- Geoffrey ColbyLos Angeles$1.1M
- Langston HollyLos Angeles$846K
- Linda LiauLos Angeles$783K
- Adam MamelakLos Angeles$678K
- Martin PhamLos Angeles$596K
- Carl LauryssenLos Angeles$571K
- Vivek MehtaLos Angeles$442K
- Patrick HsiehLos Angeles$345K
- Tiffany PerryLos Angeles$312K
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.