Yenjean Hwang, MD
Infectious Disease · Oakland, CANPI 1194744557
Payments from drug & device makers
Across 156 payments — averaging $36.26 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Microsurgical Technology, Inc.$2K
- Insmed, Inc.$883
- Amgen$230
- Johnson & Johnson$219
- AbbVie$206
- Pfizer$203
- plus $2K from 29 others
What the payments were for
- Food & beverage$3,47161%
- Education$1342%
- Charitable contribution$2,05136%
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 |
|---|---|---|
| Microsurgical Technology, Inc. | 1 | $2,051 |
| Insmed, Inc. | 41 | $883 |
| Amgen(2 entities) | 6 | $230 |
| Johnson & Johnson | 8 | $219 |
| AbbVie(2 entities) | 10 | $206 |
| Pfizer | 9 | $203 |
| Amarin Pharma, Inc. | 9 | $175 |
| CSL Behring | 6 | $168 |
| Takeda Pharmaceuticals U.S.A., Inc. | 5 | $150 |
| GSK | 5 | $148 |
| Biohaven Pharmaceuticals, Inc. | 9 | $137 |
| Lilly USA, LLC | 6 | $120 |
| Novo Nordisk | 6 | $119 |
| Astellas Pharma US Inc | 3 | $77 |
| E.r. Squibb & Sons, L.L.C. | 1 | $76 |
| Ferring Pharmaceuticals Inc. | 4 | $75 |
| Merck | 4 | $71 |
| Boehringer Ingelheim | 3 | $62 |
| Acell, Inc. | 1 | $59 |
| Baxter Healthcare | 1 | $39 |
| Upsher-smith Laboratories LLC | 2 | $39 |
| Eisai Inc. | 2 | $36 |
| AstraZeneca | 1 | $34 |
| Gilead | 2 | $34 |
| La Jolla Pharmaceutical Company | 1 | $31 |
| Almatica Pharma LLC | 1 | $28 |
| Exact Sciences | 1 | $27 |
| Avanir Pharmaceuticals, Inc. | 1 | $24 |
| Biohaven Pharmaceutical Holding Company Ltd. | 1 | $23 |
| Sanofi Pasteur Inc. | 1 | $23 |
| Esperion Therapeutics, Inc. | 1 | $23 |
| Vyera Pharmaceuticals, LLC | 1 | $19 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 1 | $19 |
| Bavarian Nordic A/s | 1 | $16 |
| Tanabe Pharma America, Inc. | 1 | $16 |
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
$5,656 in reported general payments places this provider in the 75th percentile of 856 infectious disease 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 |
|---|---|---|
| Fentanyl | 16 | $2,810 |
| ValacyclovirValacyclovir Hcl | 33 | $2,599 |
| Ampicillin Sodium | 19 | $2,084 |
| Daptomycin | 11 | $1,921 |
| Boostrix TdapDiphth,pertuss(Acell),tet Vac | 22 | $1,560 |
| Vancomycin Hcl | 19 | $1,553 |
| PaxlovidNirmatrelvir/Ritonavir | 35 | $1,429 |
| Permethrin | 14 | $1,359 |
| Sumatriptan Succinate | 13 | $1,226 |
| Amoxicillin-Clavulanate PotassAmoxicillin/Potassium Clav | 34 | $1,089 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 31 | $998 |
| Rifampin | 12 | $832 |
| Fluconazole | 20 | $813 |
| Cephalexin | 22 | $756 |
| Azithromycin | 65 | $729 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| PfizerPaxlovid | $203 | $1,42935 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 75th percentile of 856 infectious disease providers in California.
Other infectious disease in Oakland
- Peter RuaneLos Angeles$24.6M
- Raphael LandovitzLos Angeles$21.4M
- Philip RobinsonNewport Beach$4.9M
- Shawn HasslerSan Francisco$4.3M
- James McKinnellTorrance$4.3M
- Loren MillerTorrance$4.1M
- Jay GladsteinLos Angeles$4M
- Claire PomeroySacramento$3.8M
- Franco FelizartaBakersfield$3.5M
- Abhijit LimayeSan Francisco$2.9M
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.