Steven Chang, MD
Neurological Surgery · Stanford, CANPI 1437214046
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $3,592 of the $4,278 with a category attached, or 84.0%. Accuray Incorporated accounts for 84.0% of it on its own, with 2 other manufacturers making up the rest. 2025 is the largest year on record at $3,592, 7.2 times the $500 reported in 2020. That places this record below the midpoint for neurological surgery clinicians in CA, where the typical reported total is $3,356.
Across 3 payments — averaging $1426.13 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Accuray Incorporated$4K
- Zap Surgical Systems, Inc.$500
- Seaspine Orthopedics Corporation$187
What the payments were for
- Consulting fees$3,59284%
- Speaking & faculty fees$50012%
- Food & beverage$1874%
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 |
|---|---|---|
| Accuray Incorporated | 1 | $3,592 |
| Zap Surgical Systems, Inc. | 1 | $500 |
| Seaspine Orthopedics Corporation | 1 | $187 |
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.
- CyberKnife System$3,592
- Zap-X$500
How this compares
$4,278 in reported general payments places this provider in the 50th 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 |
|---|---|---|
| Dexamethasone | 17 | $154 |
Paid to pharmacies, not to this prescriber.
Other neurological surgery in Stanford
- Stephen RyuStanford$847K
- Stefan MindeaStanford$615K
- Michael LimStanford$325K
- Gerald GrantStanford$254K
- John RatliffStanford$223K
- John AdlerStanford$205K
- Christopher AmesSan Francisco$7.1M
- Larry KhooLos Angeles$2.8M
- Samy AbdouSan Diego$2.4M
- Bret AbshireMurrieta$2.3M
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.