Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum Organization subpart

Loudoun Medical Group, PC

Internal Medicine Physician in Dulles, VA · enumerated 2016 · authorized official Mary Beth Tamasy, Ceo.

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

National Provider Identifier

1962850107

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Registry record

Entity type Organization (Type 2)

Legal business name Loudoun Medical Group, PC

Other name <Unavail>

Parent organization Loudoun Medical Group, PC

Practice address 24430 Stone Springs Blvd, Suite 250, Dulles, VA, 20166

Phone (703) 404-5900

Fax (703) 421-1099

Enumeration date May 27, 2016

Last updated in NPPES Aug 18, 2023

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Mary Beth Tamasy

Title Ceo

Phone (703) 737-6010

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2023-08-18. Verify at npiregistry.cms.hhs.gov.

Where is Loudoun Medical Group, PC located?

The practice location on file with NPPES is in Dulles, VA.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-08-18.