Alvin Chang, MD
Geriatric Medicine · Tustin, CANPI 1396857181
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 339 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. It is spread thinly across 51 manufacturers, the largest accounting for just 6.7% — the pattern of someone who eats at a lot of different presentations. Among geriatric medicine clinicians in CA with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 339 payments — averaging $22.64 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Acadia Pharmaceuticals Inc$514
- Neurocrine Biosciences, Inc.$498
- Corcept Therapeutics$445
- Teva Pharmaceuticals USA, Inc.$433
- Lilly USA, LLC$413
- Avanir Pharmaceuticals, Inc.$398
- plus $5K from 45 others
What the payments were for
- Food & beverage$7,674100%
- Education$20%
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.
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.
- ARISTADA$500
- Korlym$238
- Kerendia$226
- Abre$160
- NUEDEXTA$126
- RECORLEV$125
- ARISTADA INITIO$125
- GENERAL VASCULAR INTERVENTION$125
- INGREZZA$113
How this compares
$7,676 in reported general payments places this provider in the 90th percentile of 494 geriatric 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 |
|---|---|---|
| JardianceEmpagliflozin | 333 | $312,118 |
| IngrezzaValbenazine Tosylate | 40 | $233,755 |
| Teriparatide | 92 | $207,472 |
| TrulicityDulaglutide | 197 | $187,190 |
| EliquisApixaban | 411 | $179,858 |
| FarxigaDapagliflozin Propanediol | 325 | $175,407 |
| ProliaDenosumab | 104 | $168,168 |
| Invega SustennaPaliperidone Palmitate | 19 | $71,538 |
| VascepaIcosapent Ethyl | 178 | $69,901 |
| OzempicSemaglutide | 47 | $56,471 |
| MyrbetriqMirabegron | 121 | $46,621 |
| JanuviaSitagliptin Phosphate | 68 | $35,739 |
| Evenity (2 Syringes)Romosozumab-Aqqg | 14 | $31,619 |
| XareltoRivaroxaban | 46 | $30,030 |
| KerendiaFinerenone | 36 | $29,175 |
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 |
|---|---|---|
| Boehringer IngelheimJardiance, Tradjenta | $150 | $329,126368 claims |
| Neurocrine Biosciences, Inc.Ingrezza | $498 | $233,75540 claims |
| Lilly USA, LLCTrulicity, Mounjaro | $413 | $212,879214 claims |
| Alvogen IncTeriparatide | $64 | $207,47292 claims |
| AmgenProlia, Evenity (2 Syringes) | $82 | $199,787118 claims |
| PfizerEliquis | $40 | $179,858411 claims |
| AstraZenecaFarxiga | $112 | $175,407325 claims |
| Johnson & JohnsonInvega Sustenna, Xarelto | $151 | $101,56865 claims |
| MerckJanuvia, Janumet Xr, Belsomra | $127 | $67,165126 claims |
| Novo NordiskOzempic | $238 | $56,47147 claims |
| AbbVieVraylar, Restasis, Linzess, Lumigan | $176 | $50,43358 claims |
| Astellas Pharma US IncMyrbetriq | $357 | $46,621121 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 494 geriatric medicine providers in California.
Other geriatric medicine in Tustin
- Robert FeldmanLaguna Hills$1.2M
- Oscar ChienSan Gabriel$208K
- Anders NybergSan Diego$160K
- Paul AisenSan Diego$70K
- Wayne ChenLos Angeles$40K
- Vincent HoLancaster$32K
- Kathryn SewellSan Francisco$26K
- Stephen HenryPasadena$25K
- Chaewon SongGarden Grove$21K
- Douglas ZhangSan Leandro$20K
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.