Israel Chambi, MD
Neurosurgery · Santa Ana, CANPI 1205870565
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 12 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 10 manufacturers reported payments, led by Tulavi Therapeutics, Inc. at 44.4% of the total. 2025 is the largest year on record at $330, 4.6 times the $72 reported in 2019. That places this record below the midpoint for neurosurgery clinicians in CA, where the typical reported total is $673.
Across 12 payments — averaging $56.11 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Tulavi Therapeutics, Inc.$299
- Sientra, Inc.$184
- Baxter Healthcare$46
- Vertex$31
- Centinel Spine, LLC$26
- CSL Behring$25
- plus $62 from 4 others
What the payments were for
- Food & beverage$673100%
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 |
|---|---|---|
| Tulavi Therapeutics, Inc. | 1 | $299 |
| Sientra, Inc. | 1 | $184 |
| Baxter Healthcare | 3 | $46 |
| Vertex | 1 | $31 |
| Centinel Spine, LLC | 1 | $26 |
| CSL Behring | 1 | $25 |
| Scilex Pharmaceuticals Inc. | 1 | $18 |
| IBSA Pharma Inc. | 1 | $16 |
| Boston Scientific | 1 | $14 |
| Zyla Life Sciences, 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.
How this compares
$673 in reported general payments places this provider in the 50th percentile of 25 neurosurgery 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 |
|---|---|---|
| OxycontinOxycodone Hcl | 19 | $5,470 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 163 | $4,701 |
| Oxycodone-AcetaminophenOxycodone Hcl/Acetaminophen | 35 | $2,270 |
| Oxycodone Hcl | 68 | $1,914 |
| Celecoxib | 21 | $1,233 |
| Carisoprodol | 31 | $1,111 |
| Gabapentin | 108 | $1,088 |
| Morphine Sulfate ErMorphine Sulfate | 16 | $635 |
| Diclofenac Sodium ErDiclofenac Sodium | 11 | $614 |
| Ondansetron Hcl | 21 | $224 |
| Pregabalin | 13 | $174 |
| Lorazepam | 59 | $153 |
| Clonazepam | 32 | $146 |
| Tramadol Hcl | 29 | $142 |
| Tamsulosin Hcl | 13 | $127 |
Paid to pharmacies, not to this prescriber.
Other neurosurgery in Santa Ana
- Frank Yoola Jolla$605K
- Doris WangSan Francisco$110K
- Line JacquesSan Francisco$32K
- Majid RahimifarBakersfield$30K
- James TateRedding$15K
- Kenneth BlumenfeldSan Jose$3K
- Anthony DigiorgioGreenbrae$2K
- Stephen MendenhallVacaville$2K
- Ezequiel GoldschmidtNewport Beach$1K
- Moris SenegorStockton$1K
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.