Haobin Chen, MD
Medical Oncology · Florissant, MONPI 1023456712
Payments from drug & device makers
What this record shows
This record is dominated by education: $21 of the $21 with a category attached, or 100.0%. Every reported general payment came from a single manufacturer, Mirati Therapeutics, Inc.. That places this record below the midpoint for medical oncology clinicians in MO, where the typical reported total is $3,595.
Across 1 payment — averaging $21.00 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Mirati Therapeutics, Inc.$21
Across 17 payments — averaging $22,092 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Amgen$374K
- SCS Boehringer Ingelheim Comm.v$2K
What the payments were for
- Education$21100%
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 |
|---|---|---|
| Mirati Therapeutics, Inc. | 1 | $21 |
How this compares
$21 in reported general payments places this provider in the 5th percentile of 144 medical oncology providers in Missouri.
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 |
|---|---|---|
| GilotrifAfatinib Dimaleate | 24 | $272,655 |
| TagrissoOsimertinib Mesylate | 14 | $185,656 |
| Prochlorperazine Maleate | 90 | $3,396 |
| Ondansetron Hcl | 61 | $1,209 |
| Megestrol Acetate | 19 | $768 |
| Dexamethasone | 59 | $709 |
| Mirtazapine | 49 | $672 |
| Oxycodone-AcetaminophenOxycodone Hcl/Acetaminophen | 16 | $571 |
| Oxycodone Hcl | 39 | $442 |
| Morphine Sulfate ErMorphine Sulfate | 18 | $361 |
| Albuterol Sulfate HfaAlbuterol Sulfate | 16 | $270 |
| Pantoprazole Sodium | 21 | $174 |
| LoperamideLoperamide Hcl | 15 | $149 |
| Hydrocodone-AcetaminophenHydrocodone/Acetaminophen | 16 | $148 |
| Tramadol Hcl | 32 | $113 |
Paid to pharmacies, not to this prescriber.
Other medical oncology in Florissant
- Leonid ShunyakovBolivar$2.1M
- Timothy PluardKansas City$664K
- Brad KahlSaint Louis$336K
- Michael NaughtonCape Girardeau$249K
- Russell PachynskiSaint Louis$226K
- Mark SchroederSaint Louis$198K
- George AnsstasSaint Louis$189K
- Ravi VijSaint Louis$153K
- Douglas AdkinsSaint Louis$141K
- Milan ChhedaSaint Louis$105K
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.