Quick answers
- Which hospitals does Peter J. Ahn work at?
- Medicare's official clinician data lists Peter J. Ahn at 4 hospitals: MedStar Saint Mary's Hospital, MedStar Southern Maryland Hospital Center, MedStar Washington Hospital Center and Sentara Northern Virginia Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Peter J. Ahn see patients?
- Medicare's clinician data lists 6 practice locations, including Washington, DC, Olney, MD and Leonardtown, MD. Call before your visit to confirm the address.
- What is Peter J. Ahn's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Peter J. Ahn accept Medicare assignment?
- Yes. Medicare's clinician data says Peter J. 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 Peter J. Ahn?
- (202) 429-2401, as listed in official Medicare / NPI Registry data.
- What is Peter J. Ahn's NPI number?
- 1063455095. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Peter J. Ahn works
Medicare's Facility Affiliation Data lists Peter J. Ahn at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- MedStar Saint Mary's HospitalLeonardtown, MD · Acute Care Hospital · CCN 210028
- MedStar Southern Maryland Hospital CenterClinton, MD · Acute Care Hospital · CCN 210062
- MedStar Washington Hospital CenterWashington, DC · Acute Care Hospital · CCN 090011
- Sentara Northern Virginia Medical CenterWoodbridge, VA · Acute Care Hospital · CCN 490113
Practice locations
Addresses where Peter J. Ahn is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1145 19th St NW, 311 Mmg at 19th Street NWWashington, DC 20036 (202) 429‑2401
- 18101 Prince Philip DrOlney, MD 20832 (301) 570‑7404
- 18105 Prince Philip DrOlney, MD 20832 (301) 774‑8962
- 25500 Point Lookout RdLeonardtown, MD 20650 (240) 434‑4088
- 5601 Lloch Raven BlvdBaltimore, MD 21239 (443) 444‑2626
Group practices
Medicare enrollment lists Peter J. Ahn as a member of this group (CMS data updated 2026-10-02).
- MedStar Medical Group II LLC3,767 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Find other Diagnostic Radiology doctors in District of Columbia →
Other radiologists in Washington
Clinicians with the same Medicare primary specialty in Washington, DC — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Albert Einstein College Of Medicine Of Yeshiva University |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1063455095 |
| 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