Quick answers
- Which hospitals does Mark F. Sullivan work at?
- Medicare's official clinician data lists Mark F. Sullivan at 3 hospitals: Inova Alexandria Hospital, Inova Mount Vernon Hospital and Virginia Hospital Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark F. Sullivan see patients?
- Medicare's clinician data lists 2 practice locations, including Washington, DC and Arlington, VA. Call before your visit to confirm the address.
- What is Mark F. Sullivan's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Mark F. Sullivan accept Medicare assignment?
- Yes. Medicare's clinician data says Mark F. Sullivan 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.
- Does Mark F. Sullivan offer telehealth?
- Medicare's clinician data says Mark F. Sullivan offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark F. Sullivan?
- (202) 861-0111, as listed in official Medicare / NPI Registry data.
- What is Mark F. Sullivan's NPI number?
- 1346669660. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark F. Sullivan works
Medicare's Facility Affiliation Data lists Mark F. Sullivan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Inova Alexandria HospitalAlexandria, VA · Acute Care Hospital · CCN 490040
- Inova Mount Vernon HospitalAlexandria, VA · Acute Care Hospital · CCN 490122
- Virginia Hospital CenterArlington, VA · Acute Care Hospital · CCN 490050
Practice locations
Addresses where Mark F. Sullivan is enrolled with Medicare (CMS data updated 2026-10-02).
- 2311 M St NW, Suite 301Washington, DC 20037 (202) 861‑0111
- 2445 Army Navy Dr, Suite 400Arlington, VA 22206 (703) 379‑8879
Group practices
Medicare enrollment lists Mark F. Sullivan as a member of this group (CMS data updated 2026-10-02).
- Northern Virginia Family Practice Associates11 clinicians in the group
Specialties
- Internal Medicineprimary
Find other Internal Medicine doctors in District of Columbia →
Other internal medicine doctors in Washington
Clinicians with the same Medicare primary specialty in Washington, DC — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Rochester School Of Medicine And Dentistry |
| Graduation year | 2014 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1346669660 |
| 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