Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Mallory Elizabeth Armstrong, PA-C
Physician Assistant in Fairfax, VA · enumerated 2014.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1679990451
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Registry record
Entity type Individual (Type 1)
Name Ms. Mallory Elizabeth Armstrong
Credential PA-C
Sex Female
Practice address 8505 Arlington Blvd Ste 400, Fairfax, VA, 22031
Phone (703) 698-4444
Fax (703) 851-1048
Enumeration date Mar 18, 2014
Last updated in NPPES Nov 17, 2023
Taxonomy & licenses
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 0110004536 (VA) Secondary
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA.0004993 (CO) Primary
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Is NPI 1679990451 active?
Yes, as of the latest NPPES snapshot, NPI 1679990451 is active (record last updated 2023-11-17).
How do I verify Mallory Armstrong's NPI record?
Cross-check NPI 1679990451 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all → Jonathan Keung Vascular & Interventional Radiology Physician · Fairfax, VA NPI 1740574698 Mustafa Syed Diagnostic Radiology Physician · Fairfax, VA NPI 1255618757 Pankaj Kaushal Vascular & Interventional Radiology Physician · Fairfax, VA NPI 1114260148 Eric You Vascular & Interventional Radiology Physician · Fairfax, VA NPI 1497140644 Elisabeth Lamas Physician Assistant · Fairfax, VA NPI 1407517303 Tiffany Mendoza Nurse Practitioner · Fairfax, VA NPI 1881587053
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-11-17.