Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marie Bernadette Gaston Diez, F.N.P.

Family Nurse Practitioner in Fairfax, VA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1568488138

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Registry record

Entity type Individual (Type 1)

Name Marie Bernadette Gaston Diez

Credential F.N.P.

Sex Female

Practice address 8505 Arlington Blvd, Suite 400, Fairfax, VA, 22031

Phone (571) 226-5600

Fax (571) 423-5067

Enumeration date Jul 15, 2006

Last updated in NPPES Dec 19, 2012

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 0001135171 (VA) Primary

FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan. About the FNP credential

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Marie Bernadette Diez?

The National Provider Identifier (NPI) for Marie Bernadette Diez is 1568488138, a Type 1 (individual) record in the CMS NPPES registry.

Where does Marie Bernadette Diez practice?

The practice location on file with NPPES is in Fairfax, VA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Northern Virginia Cardiology Associates, PC Cardiovascular Disease Physician · Fairfax, VA NPI 1063419927 Christine Bussey Cardiovascular Disease Physician · Fairfax, VA NPI 1598763146 Robert Murphy Retina Specialist (Ophthalmology) Physician · Fairfax, VA NPI 1942274808 A. Pilkerton Ophthalmology Physician · Fairfax, VA NPI 1750355905 Cardiac Diagnostic Services of Va Nuclear Imaging & Therapy Physician · Fairfax, VA NPI 1760457691 Manfred Vonfricken Ophthalmology Physician · Fairfax, VA NPI 1457311839 Christopher Marrow Physical Therapist · Fairfax, VA NPI 1609831510 Lynne Yao Pediatric Nephrology Physician · Fairfax, VA NPI 1114962743

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-12-19.