Loudoun Medical Group, PC
NPI 1821517699 · Family Medicine Physician · Leesburg, VA
Loudoun Medical Group, PC is a Family Medicine Physician organization in Leesburg, VA (NPI 1821517699).
Provider details
- NPI number
- 1821517699
- Entity type
- Organization
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Parent organization
- Loudoun Medical Group, PC
- Organization subpart
- Yes
- Authorized official
- Mary Beth Tamasy, Ceo(703) 737-6010
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
8 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Other names (DBA / former)
- Doing business as
- Valerie Williamson, MD
Registry dates
- Enumerated
- 2017-09-13
- Last updated
- 2023-08-18
- Certified
- 2023-08-18
Frequently asked questions
- What is Loudoun Medical Group, PC's NPI number?
- Loudoun Medical Group, PC's National Provider Identifier (NPI) is 1821517699, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Loudoun Medical Group, PC?
- Loudoun Medical Group, PC is classified in the NPPES registry as Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Loudoun Medical Group, PC located?
- Loudoun Medical Group, PC's practice location on file with NPPES is 211 Gibson Street, Nw Suite 215, Leesburg, VA 20176-2115.
- What is Loudoun Medical Group, PC's phone number?
- The practice phone number listed in the NPPES registry for Loudoun Medical Group, PC is (571) 707-2079.
- Who is the authorized official for Loudoun Medical Group, PC?
- The authorized official listed on Loudoun Medical Group, PC's NPPES record is Mary Beth Tamasy, Ceo. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Loudoun Medical Group, PC's NPI active?
- Yes — Loudoun Medical Group, PC's NPI (1821517699) is active in the NPPES registry as of the last update on 2023-08-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.