Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Northwest Internists LLC

Q: What type of organization is Northwest Internists LLC?

Northwest Internists LLC is registered in NPPES as a Internal Medicine Physician (its primary provider taxonomy).

Internal Medicine Physician in Mc Lean, VA · enumerated 2006 · authorized official Thomas Masterson, Director.

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

National Provider Identifier

1770536724

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Registry record

Entity type Organization (Type 2)

Legal business name Northwest Internists LLC

Practice address 1313 Dolley Madison Blvd, Suite 302, Mc Lean, VA, 22101

Phone (703) 356-2037

Fax (703) 734-8987

Enumeration date May 19, 2006

Last updated in NPPES Nov 7, 2007

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 0101038350 (VA) Primary

Authorized official

Name Thomas Masterson

Title Director

Phone (703) 356-2037

Other identifiers

Identifier	Type	State	Issuer
0101038350	Other	VA	MEDICAL LICENSE

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

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.

What type of organization is Northwest Internists LLC?

Northwest Internists LLC is registered in NPPES as a Internal Medicine Physician (its primary provider taxonomy).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-11-07.