NEPHROLOGY ASSOCIATES OF NORTHERN VIRGINIA, INC
NPI 1174541049
Internal Medicine - Nephrology in Fairfax, VA
About Nephrology Associates Of Northern Virginia, Inc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NEPHROLOGY ASSOCIATES OF NORTHERN VIRGINIA, INC (NPI 1174541049) is a healthcare organization registered as a nephrology in Fairfax, Virginia and active in the NPI registry since July 2006. The organization holds a CLIA Waiver certificate valid through November 1, 2026 and lists Ali R Assefi, President Of Practice, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Nephrology Associates Of Northern Virginia, Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
20Medicare enrollment records show 20 clinicians reassign Medicare billing to Nephrology Associates Of Northern Virginia, Inc, which bills Medicare for the services they deliver. Of these, 12 practice at this address and 13 within 10 miles. They are listed nearest first.
Clinicians by Medicare Specialty 4
Clinicians, nearest first (20)
Fairfax, VA 22033
Fairfax, VA 22033
Fairfax, VA 22033
Fairfax, VA 22033
Fairfax, VA 22033
Fairfax, VA 22033
Fairfax, VA 22033
Fairfax, VA 22033
Fairfax, VA 22033
Orange, CA 92868
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 49D2121299
Nephrology Associates Of Northern Virginia, Inc · Fairfax, VAFrequently 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 Nephrology Associates Of Northern Virginia, Inc's NPI number?
The NPI number for Nephrology Associates Of Northern Virginia, Inc is 1174541049. It was assigned to this organization in the NPPES registry on July 18, 2006.
Where is Nephrology Associates Of Northern Virginia, Inc located?
Nephrology Associates Of Northern Virginia, Inc is located at 13135 Lee Jackson Memorial Hwy #135, Fairfax, VA 22033. The listed phone number is (703) 961-0488.
What is Nephrology Associates Of Northern Virginia, Inc's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is Nephrology Associates Of Northern Virginia, Inc enrolled in Medicare?
Yes. Nephrology Associates Of Northern Virginia, Inc is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Nephrology Associates Of Northern Virginia, Inc?
According to the CMS Revalidation Reassignment List (October 2026 release), 20 clinicians in 4 Medicare specialties reassign their Medicare billing to Nephrology Associates Of Northern Virginia, Inc. A 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 the clinician's services. The largest specialties are Nephrology (11), Nurse Practitioner (5) and Clinical Social Worker (2). Of these, 12 practice at this address and 13 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Nephrology Associates Of Northern Virginia, Inc hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 49D2121299) is associated with this NPI, valid through November 1, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Nephrology Associates Of Northern Virginia, Inc was last updated on October 29, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.
# Nephrology Associates Of Northern Virginia, Inc · NPI 1174541049
Nephrology organization in Fairfax, Virginia. Organization record, active in the CMS NPPES registry since July 18, 2006.
## Identity
- **NPI:** 1174541049 (Entity type: Organization)
- **Enumerated:** July 18, 2006
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **Organization subpart:** No
- **Authorized official:** Ali Assefi, PRESIDENT OF PRACTICE
## Practice location
- **Address:** 13135 LEE JACKSON MEMORIAL HWY, #135, Fairfax, VA 22033-1907
- **Phone:** (703) 961-0488 · **Fax:** (703) 961-0480
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 20 clinicians in 4 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Nephrology (11), Nurse Practitioner (5), Clinical Social Worker (2); 12 practice at this address and 13 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 29, 2007
- **Other identifiers:** Medicare ID-Type Unspecified C06555 (VA); Medicare ID-Type Unspecified 172118 (VA); Medicare PIN CA1711 (VA)
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1174541049) · Data from the CMS NPPES public registry.