Edward Chang, MD
Neurological Surgery · San Francisco, CANPI 1841329646
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $494 of the $598 with a category attached, or 82.7%. 3 manufacturers reported payments, led by Medtronic at 40.0% of the total. 2025 is the largest year on record at $319, 5.0 times the $63 reported in 2023. That places this record below the midpoint for neurological surgery clinicians in CA, where the typical reported total is $3,356.
Across 6 payments — averaging $99.65 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$239
- Livanova USA, Inc.$216
- Boston Scientific$143
Across 301 payments — averaging $803.40 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.
- Neuropace, Inc.$140K
- Medtronic$102K
What the payments were for
- Travel & lodging$10317%
- Food & beverage$49483%
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 |
|---|---|---|
| Medtronic | 3 | $239 |
| Livanova USA, Inc. | 2 | $216 |
| Boston Scientific | 1 | $143 |
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
$598 in reported general payments places this provider in the 25th 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 San Francisco
- Christopher AmesSan Francisco$7.1M
- Praveen MummaneniSan Francisco$1.1M
- Lee TanSan Francisco$682K
- Jang YoonSan Francisco$227K
- 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
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.