Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William R. Stixrud, Ph.D. and Associates LLC

Clinical Neuropsychologist in Silver Spring, MD · enumerated 2007 · authorized official Starr Stixrud, Administrative Director.

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

National Provider Identifier

1205016607

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Registry record

Entity type Organization (Type 2)

Legal business name William R. Stixrud, Ph.D. and Associates LLC

Practice address 8720 Georgia Ave, Suite 300, Silver Spring, MD, 20910

Phone (301) 565-0534

Fax (301) 565-2217

Enumeration date Nov 14, 2007

Last updated in NPPES Nov 14, 2007

Taxonomy & classification

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License 1963 (MD) Primary

Authorized official

Name Starr Stixrud

Title Administrative Director

Phone (301) 565-0534

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 type of organization is William R. Stixrud, Ph.D. and Associates LLC?

William R. Stixrud, Ph.D. and Associates LLC is registered in NPPES as a Clinical Neuropsychologist (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 2007-11-14.