Nan Chen
Hematology & Oncology · Chicago, ILNPI 1558749887
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $28,634 of the $33,547 with a category attached, or 85.4%. It is spread thinly across 21 manufacturers, the largest accounting for just 19.1%. 2025 is the largest year on record at $13,845, more than ten times the $1,173 reported in 2019.
Across 103 payments — averaging $325.70 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Tersera Therapeutics LLC$6K
- AstraZeneca$6K
- Genentech USA, Inc.$5K
- Gilead$4K
- Novartis$3K
- Daiichi Sankyo Inc.$3K
- plus $8K from 15 others
Across 12 payments — averaging $27,184 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.
- Merck$135K
- Puma Biotechnology, Inc.$84K
- Eli Lilly$66K
- Pfizer$33K
- Novartis$8K
What the payments were for
- Consulting fees$28,63485%
- Speaking & faculty fees$8433%
- Grants$3501%
- Travel & lodging$5582%
- Food & beverage$2,9539%
- Education$100%
- Other$1991%
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 |
|---|---|---|
| Tersera Therapeutics LLC | 7 | $6,405 |
| AstraZeneca(2 entities) | 17 | $6,058 |
| Genentech USA, Inc. | 6 | $4,686 |
| Gilead | 5 | $3,506 |
| Novartis | 6 | $2,680 |
| Daiichi Sankyo Inc. | 4 | $2,668 |
| GE HealthCare | 1 | $2,616 |
| Seagen Inc. | 3 | $2,257 |
| Stemline Therapeutics Inc. | 4 | $1,566 |
| Pfizer | 18 | $317 |
| Bayer | 7 | $249 |
| Sanofi | 1 | $121 |
| Lilly USA, LLC | 6 | $87 |
| Amgen | 4 | $80 |
| E.r. Squibb & Sons, L.L.C. | 3 | $64 |
| Rigel Pharmaceuticals, Inc. | 3 | $56 |
| Jazz Pharmaceuticals Inc. | 3 | $49 |
| Agios Pharmaceuticals, Inc. | 2 | $30 |
| Astellas Pharma US Inc | 1 | $22 |
| Incyte Corporation | 1 | $15 |
| Takeda Pharmaceuticals U.S.A., Inc. | 1 | $14 |
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
$33,547 in reported general payments places this provider in the 85th percentile of 580 hematology & oncology providers in Illinois.
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 |
|---|---|---|
| IbrancePalbociclib | 25 | $372,810 |
| KisqaliRibociclib Succinate | 30 | $355,201 |
| TukysaTucatinib | 16 | $221,737 |
| AfinitorEverolimus | 13 | $171,581 |
| Exemestane | 76 | $17,491 |
| Letrozole | 182 | $3,643 |
| Anastrozole | 95 | $1,611 |
| Tamoxifen Citrate | 61 | $1,500 |
| Dexamethasone | 11 | $254 |
| Gabapentin | 19 | $239 |
| Ondansetron Hcl | 24 | $210 |
| Prochlorperazine Maleate | 21 | $173 |
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 |
|---|---|---|
| NovartisKisqali, Afinitor | $2,680 | $526,78343 claims |
| PfizerIbrance | $317 | $372,81025 claims |
| Seagen Inc.Tukysa | $2,257 | $221,73716 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 85th percentile of 580 hematology & oncology providers in Illinois.
Other hematology & oncology in Chicago
- Michael BishopChicago$974K
- Jamile ShammoChicago$910K
- Young Kwang ChaeChicago$563K
- Irfan MirzaChicago$544K
- Marina GarassinoChicago$397K
- Chih-Yi LiaoChicago$317K
- Rita NandaChicago$286K
- Shuo MaChicago$280K
- Santosh SarafChicago$275K
- Peter RiedellChicago$273K
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.