John Koreth
Hematology & Oncology · Boston, MANPI 1396706503
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $29,558 of the $41,128 with a category attached, or 71.9%. 9 manufacturers reported payments, led by Mallinckrodt Hospital Products Inc. at 55.9% of the total. Reporting peaked in 2020 at $24,770 and has fallen 79.9% since, to $4,973 in 2025.
Across 26 payments — averaging $1581.86 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Mallinckrodt Hospital Products Inc.$23K
- CSL Behring$5K
- Merck$5K
- EMD Serono, Inc.$3K
- Regeneron$2K
- Amgen$2K
- plus $2K from 3 others
Across 147 payments — averaging $86,997 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.
- Clinigen, Inc.$7.6M
- Iovance Biotherapeutics, Inc.$2.8M
- Regeneron$1M
- CSL Behring$913K
- Amgen$407K
- National Marrow Donor Program$87K
What the payments were for
- Consulting fees$29,55872%
- Grants$1,5004%
- Travel & lodging$9,69424%
- Food & beverage$3331%
- Education$430%
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 |
|---|---|---|
| Mallinckrodt Hospital Products Inc. | 12 | $23,010 |
| CSL Behring | 3 | $4,930 |
| Merck | 1 | $4,500 |
| EMD Serono, Inc. | 2 | $3,000 |
| Regeneron | 2 | $2,322 |
| Amgen | 3 | $1,749 |
| Sanofi-aventis U.S. LLC | 1 | $1,500 |
| Therakos LLC | 1 | $75 |
| AstraZeneca | 1 | $43 |
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.
- CELLEX/XTS PHOTOPHERESIS SYSTEM$17,562
- CELLEX$5,240
How this compares
$41,128 in reported general payments places this provider in the 80th percentile of 374 hematology & 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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| JakafiRuxolitinib Phosphate | 25 | $269,788 |
| Ursodiol | 24 | $2,563 |
| Gabapentin | 37 | $685 |
| Acyclovir | 31 | $649 |
| ValacyclovirValacyclovir Hcl | 12 | $614 |
| Prednisone | 33 | $312 |
| Sulfamethoxazole-TrimethoprimSulfamethoxazole/Trimethoprim | 23 | $142 |
Paid to pharmacies, not to this prescriber.
Other hematology & oncology in Boston
- David ScaddenBoston$2.6M
- Sara TolaneyBoston$799K
- Matthew DavidsBoston$693K
- Julio HajdenbergBoston$583K
- Paul RichardsonBoston$523K
- Seth WanderBoston$464K
- Corey CutlerBoston$454K
- Hanny Al-SamkariBoston$412K
- Rupal BhattBoston$380K
- Matthew Vander HeidenBoston$355K
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.