Melissa Duncanson, MD
Obstetrics & Gynecology · San Mateo, CANPI 1144753443
Payments from drug & device makers
Across 34 payments — averaging $16.33 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Mayne Pharma Commercial LLC$173
- Exact Sciences$90
- AbbVie$47
- Hologic Sales And Service, LLC$46
- Therapeuticsmd, Inc.$44
- Pfizer$26
- plus $129 from 7 others
What the payments were for
- Food & beverage$555100%
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 |
|---|---|---|
| Mayne Pharma Commercial LLC | 16 | $173 |
| Exact Sciences | 4 | $90 |
| AbbVie | 2 | $47 |
| Hologic Sales And Service, LLC | 2 | $46 |
| Therapeuticsmd, Inc. | 2 | $44 |
| Pfizer | 1 | $26 |
| Biogen | 1 | $22 |
| Sumitomo Pharma America, Inc. | 1 | $22 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 1 | $20 |
| Coopersurgical, Inc. | 1 | $20 |
| Takeda Pharmaceuticals U.S.A., Inc. | 1 | $20 |
| Bayer | 1 | $15 |
| Meditrina | 1 | $9 |
How this compares
$555 in reported general payments places this provider in the 55th 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 | 12 | $476 |
| Fluconazole | 11 | $87 |
Paid to pharmacies, not to this prescriber.
Other obstetrics & gynecology in San Mateo
- Peyman BanooniBeverly Hills$9.2M
- Vellore BhupathyWhittier$4.3M
- Edwin RamirezOxnard$3.5M
- Nam TranSan Francisco$3M
- Dmitriy RomanenkoSouth Gate$2.7M
- Anita NelsonTorrance$2.1M
- Oleg BessLos Angeles$1.7M
- Rovena ReaganSan Diego$1.7M
- Dana Shippdel Mar$1.7M
- Vanessa JacobySan Francisco$1.3M
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.