Quick answers
- Which hospitals does Jonathan D. Gardner work at?
- Medicare's official clinician data lists Jonathan D. Gardner at 4 hospitals: MedStar Franklin Square Medical Center, MedStar Good Samaritan Hospital, MedStar Union Memorial Hospital and The Johns Hopkins Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jonathan D. Gardner see patients?
- Medicare's clinician data lists 3 practice locations, including Baltimore, MD. Call before your visit to confirm the address.
- What is Jonathan D. Gardner's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty, and also Advanced Heart Failure and Transplant Cardiology.
- Does Jonathan D. Gardner accept Medicare assignment?
- Yes. Medicare's clinician data says Jonathan D. Gardner 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 Jonathan D. Gardner?
- (443) 777-7000, as listed in official Medicare / NPI Registry data.
- What is Jonathan D. Gardner's NPI number?
- 1639490840. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jonathan D. Gardner works
Medicare's Facility Affiliation Data lists Jonathan D. Gardner at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- MedStar Franklin Square Medical CenterRosedale, MD · Acute Care Hospital · CCN 210015
- MedStar Good Samaritan HospitalBaltimore, MD · Acute Care Hospital · CCN 210056
- MedStar Union Memorial HospitalBaltimore, MD · Acute Care Hospital · CCN 210024
- The Johns Hopkins HospitalBaltimore, MD · Acute Care Hospital · CCN 210009
Practice locations
Addresses where Jonathan D. Gardner is enrolled with Medicare (CMS data updated 2026-10-02).
- 9000 Franklin Square DrBaltimore, MD 21237 (443) 777‑7000
- 9105 Franklin Square DrBaltimore, MD 21237 (443) 777‑7785
- 9105 Franklin Square Dr, Suite 209Baltimore, MD 21237 (410) 554‑6550
Group practices
Medicare enrollment lists Jonathan D. Gardner as a member of these groups (CMS data updated 2026-10-02).
- MedStar Medical Group II LLC3,767 clinicians in the group
- MedStar Heart Institute LLC301 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Maryland →
Other cardiologists in Baltimore
Clinicians with the same Medicare primary specialty in Baltimore, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639490840 |
| 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