Stephen Walsh
Infectious Disease · Boston, MANPI 1407828098
Payments from drug & device makers
Across 901 payments — averaging $6013.68 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Modernatx, Inc.$3.9M
- Sanofi Pasteur Inc.$1.1M
- Janssen Research & Development, LLC$176K
- Pfizer$162K
- Sanofi US Services Inc.$55K
- CSL Behring$35K
- plus $31K from 3 others
Across 14 payments — averaging $1942.86 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.
- Biontech SE$23K
- Sanofi Pasteur Inc.$4K
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 |
|---|---|---|
| Modernatx, Inc. | 781 | $3,885,147 |
| Sanofi Pasteur Inc. | 76 | $1,074,112 |
| Janssen Research & Development, LLC | 1 | $176,358 |
| Pfizer | 33 | $161,579 |
| Sanofi US Services Inc. | 5 | $55,309 |
| CSL Behring | 1 | $34,800 |
| Regeneron | 2 | $17,500 |
| AstraZeneca | 1 | $13,172 |
| Biontech SE | 1 | $350 |
How this compares
$5,418,328 in reported general payments places this provider in the 95th percentile of 368 infectious disease 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 infectious disease in Boston
- Dan BarouchBoston$35.8M
- Shahin LockmanBoston$7.4M
- Francisco MartyBoston$6.2M
- Sophia KooBoston$4.9M
- David SnydmanBoston$2.6M
- Yoav GolanBoston$1.8M
- Todd EllerinBoston$1.7M
- Nicolas IssaBoston$1.3M
- Debra PoutsiakaBoston$1.3M
- Sarah FortuneBoston$1.1M
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.