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Loudoun Medical Group, PC

Sleep Medicine (Internal Medicine) Physician in Chantilly, VA · enumerated 2014 · authorized official Mary Beth Tamasy, Ceo.

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

National Provider Identifier

1376954073

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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 4080 Lafayette Center Drive, Suite 170c, Chantilly, VA, 20151
Phone (703) 729-3420
Fax (703) 729-3422
Enumeration date May 15, 2014
Last updated in NPPES Apr 24, 2023

Taxonomy & classification

207RS0012X Sleep Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Mary Beth Tamasy
Title Ceo
Phone (703) 737-6001

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.

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Frequently asked questions

What type of organization is Loudoun Medical Group, PC?
Loudoun Medical Group, PC is registered in NPPES as a Sleep Medicine (Internal Medicine) Physician (its primary provider taxonomy).
What is a Type 2 NPI?
A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

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