John Sierocki, MD
Medical Oncology · Princeton, NJNPI 1487792354
Payments from drug & device makers
Across 12 payments — averaging $63.05 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Athenex Pharmaceutical Division, LLC$350
- AstraZeneca$117
- Gilead$116
- Johnson & Johnson$100
- Novartis$32
- Daiichi Sankyo Inc.$15
- plus $27 from 2 others
What the payments were for
- Speaking & faculty fees$35046%
- Food & beverage$14920%
- Education$25834%
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 |
|---|---|---|
| Athenex Pharmaceutical Division, LLC | 2 | $350 |
| AstraZeneca | 2 | $117 |
| Gilead | 3 | $116 |
| Johnson & Johnson | 1 | $100 |
| Novartis | 1 | $32 |
| Daiichi Sankyo Inc. | 1 | $15 |
| Bristol Myers Squibb | 1 | $14 |
| Eisai Inc. | 1 | $13 |
How this compares
$757 in reported general payments places this provider in the 25th percentile of 112 medical oncology providers in New Jersey.
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 |
|---|---|---|
| XtandiEnzalutamide | 19 | $264,143 |
| NubeqaDarolutamide | 18 | $244,158 |
| Gammagard LiquidImmun Glob G(Igg)/Gly/Iga Ov50 | 37 | $210,793 |
| VerzenioAbemaciclib | 17 | $177,020 |
| Lupron DepotLeuprolide Acetate | 42 | $135,701 |
| DarzalexDaratumumab | 11 | $77,879 |
| EliquisApixaban | 37 | $26,469 |
| ZarxioFilgrastim-Sndz | 16 | $6,279 |
| Fulvestrant | 12 | $5,682 |
| SynthroidLevothyroxine Sodium | 33 | $3,340 |
| Pantoprazole Sodium | 133 | $3,245 |
| Levothyroxine Sodium | 183 | $2,899 |
| Letrozole | 88 | $2,406 |
| Methenamine Hippurate | 19 | $2,156 |
| Exemestane | 11 | $1,728 |
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 |
|---|---|---|
| Johnson & JohnsonDarzalex | $100 | $77,87911 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 25th percentile of 112 medical oncology providers in New Jersey.
Other medical oncology in Princeton
- Martin GutierrezHackensack$41.8M
- James McCloskeyHackensack$17.1M
- Lori LeslieHackensack$11.9M
- Tatyana FeldmanHackensack$8.4M
- Benjamin FreemanMorristown$7.5M
- Kristen SpencerNew Brunswick$7.2M
- David SiegelHackensack$6.9M
- Biren SaraiyaNew Brunswick$6.2M
- Noa BiranHackensack$5.8M
- Sanjay GoelNew Brunswick$5.1M
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.