Quick answers
- Which hospitals does Andrew Ahn work at?
- Medicare's official clinician data lists Andrew Ahn at 2 hospitals: Inova Loudoun Hospital and Reston Hospital Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Andrew Ahn see patients?
- Medicare's clinician data lists 4 practice locations, including Arlington, VA, Reston, VA and Dulles, VA. Call before your visit to confirm the address.
- What is Andrew Ahn's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Andrew Ahn accept Medicare assignment?
- Yes. Medicare's clinician data says Andrew Ahn 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 Andrew Ahn?
- (703) 558-5000, as listed in official Medicare / NPI Registry data.
- What is Andrew Ahn's NPI number?
- 1154785574. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Andrew Ahn works
Medicare's Facility Affiliation Data lists Andrew Ahn at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Inova Loudoun HospitalLeesburg, VA · Acute Care Hospital · CCN 490043
- Reston Hospital CenterReston, VA · Acute Care Hospital · CCN 490107
Practice locations
Addresses where Andrew Ahn is enrolled with Medicare (CMS data updated 2026-10-02).
- 1701 N George Mason DrArlington, VA 22205 (703) 558‑5000
- 1850 Town Ctr PkwyReston, VA 20190 (240) 686‑2300
- 24440 Stone Springs BlvdDulles, VA 20166 (240) 686‑2300
- 24570 Stone Springs BlvdDulles, VA 20166 (240) 686‑2300
Group practices
Medicare enrollment lists Andrew Ahn as a member of this group (CMS data updated 2026-10-02).
- Emergency Medicine Associates P.A., P.C.714 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Arlington
Clinicians with the same Medicare primary specialty in Arlington, VA — not a recommendation.
Clinician information
| Graduation year | 2016 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154785574 |
| 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