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

Loudoun Medical Group, PC

Geriatric Medicine (Internal Medicine) Physician in Sterling, VA · enumerated 2013 · authorized official Mary Beth Tamasy, Ceo.

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

National Provider Identifier

1912341686

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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 21495 Ridgetop Circle, Suite 102, Sterling, VA, 20166

Phone (703) 404-5900

Fax (703) 421-1099

Enumeration date Apr 24, 2013

Last updated in NPPES Apr 24, 2023

Taxonomy & classification

207RG0300X Geriatric Medicine (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

Where is Loudoun Medical Group, PC located?

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2023-04-24. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Loudoun Medical Group, PC Internal Medicine Physician · Sterling, VA NPI 1255601605

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-04-24.