Marios Giannakis, MD
Medical Oncology · Boston, MANPI 1417185729
Payments from drug & device makers
What this record shows
This record is dominated by grants: $66,667 of the $70,728 with a category attached, or 94.3%. Genentech, Inc. accounts for 94.3% of it on its own, with 2 other manufacturers making up the rest.
Across 4 payments — averaging $17,682 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Genentech, Inc.$67K
- AstraZeneca$2K
- Chromacode, Inc$2K
Across 13 payments — averaging $42,597 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$548K
- Novartis$6K
What the payments were for
- Consulting fees$2,0553%
- Speaking & faculty fees$2,0003%
- Grants$66,66794%
- Food & beverage$60%
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 |
|---|---|---|
| Genentech, Inc. | 1 | $66,667 |
| AstraZeneca | 2 | $2,061 |
| Chromacode, Inc | 1 | $2,000 |
How this compares
$70,728 in reported general payments places this provider in the 80th percentile of 308 medical oncology providers in Massachusetts.
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.
Other medical oncology in Boston
- George DemetriBoston$1.6M
- Keith FlahertyBoston$932K
- Alicia MorgansBoston$690K
- Pasi Antero JanneBoston$458K
- Robert HaddadBoston$451K
- Irene GhobrialBoston$431K
- Joaquin Bellmunt MolinsBoston$415K
- Jeremy AbramsonBoston$334K
- Justin GainorBoston$324K
- Narjust FlorezBoston$324K
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.