Stewart Karr, MD
Diagnostic Radiology · Silver Spring, MDNPI 1477567022
Payments from drug & device makers
What this record shows
18 manufacturers reported payments, led by Boston Scientific at 38.0% of the total. Reporting peaked in 2019 at $1,437 and has fallen 97.8% since, to $31 in 2025. Among diagnostic radiology clinicians in MD with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 60 payments — averaging $54.02 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Boston Scientific$1K
- Stryker$668
- Cook Medical LLC$338
- Medtronic$209
- Inari Medical, Inc.$188
- Sirtex Medical Inc$150
- plus $457 from 12 others
What the payments were for
- Travel & lodging$1,54248%
- Food & beverage$1,69952%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| Boston Scientific | 10 | $1,232 |
| Stryker | 6 | $668 |
| Cook Medical LLC | 12 | $338 |
| Medtronic(3 entities) | 10 | $209 |
| Inari Medical, Inc. | 5 | $188 |
| Sirtex Medical Inc | 1 | $150 |
| Argon Medical Devices, Inc. | 1 | $100 |
| Bard Peripheral Vascular, Inc. | 4 | $75 |
| Shockwave Medical, Inc | 1 | $73 |
| Angiodynamics, Inc. | 2 | $48 |
| EKOS Corporation | 1 | $34 |
| Johnson & Johnson | 1 | $24 |
| Surmodics, Inc. | 1 | $23 |
| Terumo Medical Corporation | 1 | $20 |
| Abbott | 1 | $16 |
| Penumbra, Inc. | 1 | $15 |
| Covidien LP | 1 | $15 |
| Biocompatibles, 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
$3,241 in reported general payments places this provider in the 90th percentile of 674 diagnostic radiology providers in Maryland.
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 diagnostic radiology in Silver Spring
- Eliot SiegelBaltimore$702K
- Myung Sup KimCumberland$250K
- Florence DooBaltimore$147K
- Doris LinBaltimore$127K
- Atif ZaheerBaltimore$115K
- Charles WhiteBaltimore$93K
- Neal HalseyBaltimore$67K
- Clifford WeissBaltimore$64K
- Sheila ShethBaltimore$61K
- Elliot FishmanBaltimore$55K
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.