Quick answers
- Which hospitals does Stewart Karr work at?
- Medicare's official clinician data lists Stewart Karr at 4 hospitals: Adventist Healthcare Shady Grove Medical Center, Adventist Healthcare White Oak Medical Center, Johns Hopkins Howard County Medical Center and The Johns Hopkins Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Stewart Karr see patients?
- Medicare's clinician data lists 4 practice locations, including Silver Spring, MD, Columbia, MD and Potomac, MD. Call before your visit to confirm the address.
- What is Stewart Karr's specialty?
- Medicare lists Interventional Radiology as the primary specialty, and also Diagnostic Radiology.
- Does Stewart Karr accept Medicare assignment?
- Yes. Medicare's clinician data says Stewart Karr accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Stewart Karr?
- (240) 637-6222, as listed in official Medicare / NPI Registry data.
- What is Stewart Karr's NPI number?
- 1477567022. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Stewart Karr works
Medicare's Facility Affiliation Data lists Stewart Karr at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Healthcare Shady Grove Medical CenterRockville, MD · Acute Care Hospital · CCN 210057
- Adventist Healthcare White Oak Medical CenterSilver Spring, MD · Acute Care Hospital · CCN 210016
- Johns Hopkins Howard County Medical CenterColumbia, MD · Acute Care Hospital · CCN 210048
- The Johns Hopkins HospitalBaltimore, MD · Acute Care Hospital · CCN 210009
Practice locations
Addresses where Stewart Karr is enrolled with Medicare (CMS data updated 2026-10-02).
- 11890 Healing Way, Ahc ImagingSilver Spring, MD 20904 (240) 637‑6222
- 1500 Forest Glen RdSilver Spring, MD 20910 (301) 754‑7361
- 5755 Cedar LnColumbia, MD 21044 (480) 207‑4091
- 7804 River Falls DrPotomac, MD 20854 (480) 207‑4091
Group practices
Medicare enrollment lists Stewart Karr as a member of these groups (CMS data updated 2026-10-02).
- Blackwell Physicians, LLC68 clinicians in the group
- Diagnostic Medical Imaging PA11 clinicians in the group
Specialties
- Interventional Radiologyprimary
- Diagnostic Radiologyalso
Other interventional radiologists in Silver Spring
Clinicians with the same Medicare primary specialty in Silver Spring, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1986 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1477567022 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians