MARIE BERNADETTE GASTON DIEZ F.N.P.
NPI 1568488138
Nurse Practitioner - Family in Fairfax, VA
About Marie Bernadette Gaston Diez F.n.p. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIE BERNADETTE GASTON DIEZ F.N.P. (NPI 1568488138) is an individual family provider in Fairfax, Virginia, licensed in Virginia (0001135171) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS and is a graduate of Marymount University (1995).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Marie Bernadette Gaston Diez F.n.p. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Marie Bernadette Diez reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Falls Church, VA 22042
- Reassigned Medicare billing, District of Columbia and Virginia enrollments
- Also billed through NPI 1588717755 (Virginia)
- 2,618 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 22031 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
FAIRFAX, VA 22031
FAIRFAX, VA 22031
FAIRFAX, VA 22031
FAIRFAX, VA 22031
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Marie Bernadette Diez's NPI number?
The NPI number for Marie Bernadette Diez is 1568488138. It was assigned to this individual provider in the NPPES registry on July 15, 2006.
Where is Marie Bernadette Diez located?
Marie Bernadette Diez practices at 8505 Arlington Blvd Suite 400, Fairfax, VA 22031. The listed phone number is (571) 226-5600.
What is Marie Bernadette Diez's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Marie Bernadette Diez enrolled in Medicare?
Yes. Marie Bernadette Diez is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Marie Bernadette Diez's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marie Bernadette Diez reassigns Medicare benefits to Inova Health Care Services (Falls Church, VA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marie Bernadette Diez's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Marie Bernadette Diez was last updated on December 19, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Marie Bernadette Gaston Diez, F.N.P. · NPI 1568488138
Family physician in Fairfax, Virginia. Individual provider, active in the CMS NPPES registry since July 15, 2006.
## Identity
- **NPI:** 1568488138 (Entity type: Individual)
- **Enumerated:** July 15, 2006
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 0001135171 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** 8505 ARLINGTON BLVD, SUITE 400, Fairfax, VA 22031
- **Phone:** (571) 226-5600 · **Fax:** (571) 423-5067
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Inova Health Care Services (NPI 1952320061, Falls Church, VA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Marymount University, class of 1995
## Record status
- **NPPES last updated:** December 19, 2012
- **Other identifiers:** Medicare UPIN Q54517 (VA)
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Source: [NPI Profile](https://npiprofile.com/npi/1568488138) · Data from the CMS NPPES public registry.