VALERIE WILLIAMSON, MD
NPI 1033638739
Clinic/Center - Urgent Care in Sterling, VA

Q: What is Loudoun Medical Group, PC's NPI number?

The NPI number for Loudoun Medical Group, PC is 1033638739. It was assigned to this organization in the NPPES registry on September 13, 2017. The provider is doing business as Valerie Williamson, MD.

Q: What is Loudoun Medical Group, PC's specialty?

The primary specialty registered for this NPI is Clinic/Center, specializing in Urgent Care, with taxonomy code 261QU0200X.

Active since September 13, 2017CLIA 49D2142487 · Waiver

46440 BENEDICT DR STE 107, STERLING, VA 20164(571) 707-2079(571) 291-9196 Get Directions Write a Review

NPPES record last updated: August 17, 2023. Verified against the NPPES registry weekly; last sync: September 20, 2026.

Record update history: Aug 17, 2023, Aug 10, 2021, Sep 13, 2017 (3 updates tracked since 2017).

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About Valerie Williamson, Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

VALERIE WILLIAMSON, MD (NPI 1033638739) is a healthcare organization registered as an urgent care in Sterling, Virginia and active in the NPI registry since September 2017. The organization holds a CLIA Waiver certificate valid through January 10, 2028 and lists Mary Beth Tamasy, Ceo, as its authorized official.

NPPES Registry Identity

NPI1033638739

Entity TypeOrganization

Primary Taxonomy261QU0200X

Legal Business NameLOUDOUN MEDICAL GROUP, PC

Location Address46440 BENEDICT DR STE 107Sterling, VA 20164-6602

Mailing Address224d Cornwall St Nw Ste 403Leesburg, VA 20176-2704 · (703) 737-6001 · Fax (703) 443-8643

Phone(571) 707-2079

Fax(571) 291-9196

Organization SubpartYes

Authorized OfficialMary Beth TamasyCeo · (703) 737-6010

Enumeration DateSeptember 13, 2017

Last NPPES UpdateAugust 17, 20233 updates tracked since enumeration

NPPES CertifiedAugust 17, 2023

✔ NPI 1033638739 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyClinic/Center · Urgent CareAmbulatory Health Care Facilities

Taxonomy Code261QU0200X

46440 BENEDICT DR STE 107, Sterling, VA 20164

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Other Names 1

Doing Business AsValerie Williamson, Md

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 49D2142487

Loudoun Medical Group, PC Dba Lmg Cornwall Urgent Care · Leesburg, VA

Active · expires Jan 10, 2028

CLIA Number49D2142487

Laboratory TypePhysician Office

Certificate Effective DateJanuary 11, 2026

Certificate Expiration DateJanuary 10, 2028

Laboratory DirectorJoseph Lee

Laboratory Phone(571) 707-2086

Laboratory LocationLoudoun Medical Group, PC Dba Lmg Cornwall Urgent Care211 Gibson Street, NW Suite 215, Leesburg, VA 20176

CLIA data matches this NPI record on: Name

This certificate is issued to a laboratory to perform only waived tests.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. JUDITH LIM GRECO MD

Internal Medicine

46440 BENEDICT DR STE 107
STERLING, VA 20164

Loudoun County (703) 450-1125

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 Loudoun Medical Group, PC's NPI number?

The NPI number for Loudoun Medical Group, PC is 1033638739. It was assigned to this organization in the NPPES registry on September 13, 2017. The provider is doing business as Valerie Williamson, MD.

Where is Loudoun Medical Group, PC located?

Loudoun Medical Group, PC is located at 46440 Benedict Dr Ste 107, Sterling, VA 20164. The listed phone number is (571) 707-2079.

What is Loudoun Medical Group, PC's specialty?

The primary specialty registered for this NPI is Clinic/Center, specializing in Urgent Care, with taxonomy code 261QU0200X.

Does Loudoun Medical Group, PC hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 49D2142487) is associated with this NPI, valid through January 10, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Loudoun Medical Group, PC was last updated on August 17, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.