Stewart B. Karr, MD
NPI 1477567022ActiveIndividual· Radiology, Diagnostic Radiology· Silver Spring, MD
Radiology, Diagnostic Radiology (MD) with Blackwell Physicians, LLC and 1 other group, practicing in Silver Spring, Maryland. Medicare paid $81,262 for services to 1,458 patients in 2024. Cook Medical LLC reported $31.17 in payments in 2025, mostly food and beverage. Lists Adventist Healthcare Shady Grove Medical Center and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1477567022 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 28, 2006 |
| Last updated in NPPES | May 7, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Radiology, Diagnostic Radiology Primary | 2085R0202X | D0035868 | MD |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Interventional Radiology (DC); Practitioner - Diagnostic Radiology (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,458 |
|---|---|
| Services billed | 2,363 across 147 procedure codes |
| Paid by Medicare | $81,262 |
Education and affiliations
| Graduation year | 1986 |
|---|---|
| Medicare specialty | Interventional Radiology |
| Secondary specialties | Diagnostic Radiology |
Medical groups
- Blackwell Physicians, LLCRockville, MD · 68 clinicians
- Diagnostic Medical Imaging PASilver Spring, MD · 11 clinicians
Hospital affiliations
- Adventist Healthcare Shady Grove Medical CenterRockville, MD
- Adventist Healthcare White Oak Medical CenterSilver Spring, MD
- Johns Hopkins Hospital, theBaltimore, MD
- Johns Hopkins Howard County Medical CenterColumbia, MD
Industry payments (Open Payments)
- 2025$31.17 · 1 payment from 1 company
- 2024$70.57 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Cook Medical LLC | $31.17 | 1 |
What the 2025 payments were for
- Food and Beverage$31.17 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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