Shannon Sullivan, MD
Obstetrics & Gynecology · Walnut Creek, CANPI 1255673463
Payments from drug & device makers
What this record shows
This record is dominated by education: $93,323 of the $118,132 with a category attached, or 79.0%. Intuitive Surgical accounts for 99.8% of it on its own, with 6 other manufacturers making up the rest. Reporting peaked in 2024 at $29,503 and has fallen 71.0% since, to $8,547 in 2025. Among obstetrics & gynecology 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 119 payments — averaging $992.70 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Intuitive Surgical$118K
- Astellas Pharma US Inc$73
- AbbVie$72
- Therapeuticsmd, Inc.$38
- Bayer$24
- Sumitomo Pharma America, Inc.$17
- plus $15 from 1 others
What the payments were for
- Speaking & faculty fees$18,00015%
- Travel & lodging$2,3272%
- Food & beverage$4,4824%
- Education$93,32379%
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 |
|---|---|---|
| Intuitive Surgical | 107 | $117,893 |
| Astellas Pharma US Inc | 1 | $73 |
| AbbVie | 4 | $72 |
| Therapeuticsmd, Inc. | 2 | $38 |
| Bayer | 1 | $24 |
| Sumitomo Pharma America, Inc. | 1 | $17 |
| Mayne Pharma Commercial LLC | 3 | $15 |
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.
- Da Vinci Surgical System$110,968
- DA VINCI SP$6,000
How this compares
$118,132 in reported general payments places this provider in the 95th percentile of 3,784 obstetrics & gynecology 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 |
|---|---|---|
| Estradiol | 33 | $3,191 |
| Estradiol (Twice Weekly)Estradiol | 28 | $2,239 |
Paid to pharmacies, not to this prescriber.
Other obstetrics & gynecology in Walnut Creek
- Steve YuNorthridge$964K
- Samir HageRedlands$640K
- Malcolm MunroLos Angeles$609K
- Michael KrychmanCosta Mesa$547K
- Anita NelsonTorrance$530K
- Jan SegnitzSan Jose$511K
- Risa KaganBerkeley$497K
- Michael GreenOxnard$424K
- Howard SalvaySanta Cruz$421K
- Marc WinterLaguna Hills$399K
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.