Quick answers
- Which hospitals does Mary Ellen Gallagher work at?
- Medicare's official clinician data lists Mary Ellen Gallagher at 2 hospitals: Sibley Memorial Hospital and Virginia Hospital Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mary Ellen Gallagher see patients?
- Medicare's clinician data lists 1 practice location in Arlington, VA. Call before your visit to confirm the address.
- What is Mary Ellen Gallagher's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Pediatric Medicine.
- Does Mary Ellen Gallagher accept Medicare assignment?
- Yes. Medicare's clinician data says Mary Ellen Gallagher 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 Mary Ellen Gallagher?
- (703) 527-6664, as listed in official Medicare / NPI Registry data.
- What is Mary Ellen Gallagher's NPI number?
- 1417956814. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mary Ellen Gallagher works
Medicare's Facility Affiliation Data lists Mary Ellen Gallagher at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Sibley Memorial HospitalWashington, DC · Acute Care Hospital · CCN 090005
- Virginia Hospital CenterArlington, VA · Acute Care Hospital · CCN 490050
Practice locations
Addresses where Mary Ellen Gallagher is enrolled with Medicare (CMS data updated 2026-10-02).
- 2501 N Glebe Rd, Suite 301Arlington, VA 22207 (703) 527‑6664
Specialties
- Internal Medicineprimary
- Pediatric Medicinealso
Other internal medicine doctors in Arlington
Clinicians with the same Medicare primary specialty in Arlington, VA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1999 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417956814 |
| 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