Pai Chen, DO
Internal Medicine · Arcadia, CANPI 1063405892
Payments from drug & device makers
Across 78 payments — averaging $85.10 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AstraZeneca$876
- Amgen$558
- GSK$504
- Teva Pharmaceuticals USA, Inc.$468
- Phathom Pharmaceuticals, Inc.$447
- AbbVie$397
- plus $3K from 18 others
What the payments were for
- Travel & lodging$150%
- Food & beverage$6,623100%
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 |
|---|---|---|
| AstraZeneca | 8 | $876 |
| Amgen | 10 | $558 |
| GSK | 5 | $504 |
| Teva Pharmaceuticals USA, Inc. | 4 | $468 |
| Phathom Pharmaceuticals, Inc. | 3 | $447 |
| AbbVie(2 entities) | 4 | $397 |
| Eisai Inc. | 4 | $394 |
| Pfizer | 16 | $373 |
| Amarin Pharma, Inc. | 3 | $307 |
| Otsuka America Pharmaceutical, Inc. | 2 | $250 |
| Aimmune Therapeutics, Inc. | 2 | $250 |
| Johnson & Johnson | 2 | $237 |
| CMP Pharma, Inc. | 1 | $237 |
| Exact Sciences | 2 | $157 |
| Bayer | 1 | $140 |
| Lilly USA, LLC | 2 | $137 |
| Lexicon Pharmaceuticals, Inc. | 1 | $125 |
| Boehringer Ingelheim | 1 | $125 |
| ARS Pharmaceuticals Operations, Inc. | 1 | $125 |
| Esperion Therapeutics, Inc. | 1 | $125 |
| Axsome Therapeutics, Inc. | 1 | $125 |
| Kyowa Kirin, Inc. | 1 | $122 |
| Kowa Pharmaceuticals America, Inc. | 1 | $122 |
| Gilead | 2 | $36 |
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
$6,638 in reported general payments places this provider in the 90th percentile of 13,581 internal medicine 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 |
|---|---|---|
| CreonLipase/Protease/Amylase | 39 | $53,842 |
| JardianceEmpagliflozin | 67 | $52,259 |
| ProliaDenosumab | 28 | $45,093 |
| EliquisApixaban | 45 | $41,499 |
| JanuviaSitagliptin Phosphate | 43 | $33,359 |
| VascepaIcosapent Ethyl | 70 | $21,146 |
| FarxigaDapagliflozin Propanediol | 16 | $15,484 |
| XareltoRivaroxaban | 12 | $14,544 |
| TrulicityDulaglutide | 14 | $13,088 |
| RestasisCyclosporine | 19 | $12,197 |
| Icosapent Ethyl | 34 | $9,130 |
| Atorvastatin Calcium | 750 | $9,117 |
| Olmesartan Medoxomil | 300 | $5,904 |
| Losartan Potassium | 337 | $5,281 |
| Entecavir | 21 | $4,500 |
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 |
|---|---|---|
| AbbVieCreon, Restasis | $397 | $66,03958 claims |
| Boehringer IngelheimJardiance | $125 | $52,25967 claims |
| AmgenProlia | $558 | $45,09328 claims |
| PfizerEliquis, Paxlovid | $373 | $42,86383 claims |
| AstraZenecaFarxiga | $876 | $15,48416 claims |
| Johnson & JohnsonXarelto | $237 | $14,54412 claims |
| Lilly USA, LLCTrulicity | $137 | $13,08814 claims |
| Kowa Pharmaceuticals America, Inc.Livalo | $122 | $4,28414 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 90th percentile of 13,581 internal medicine providers in California.
Other internal medicine in Arcadia
- Andrew ChengSouth San Francisco$55.1M
- Joel NeutelTustin$34.9M
- Donald BrandonSan Diego$34M
- William TownerLos Angeles$27.4M
- Rahul AggarwalSan Francisco$24M
- Masoud AzizadNorthridge$21.1M
- Helen StaceyWalnut Creek$20.4M
- Rohit Loombala Jolla$15.1M
- Zeid KayaliColton$14.2M
- Alexandra DrakakiSanta Monica$14.2M
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.