Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Roger D. Williams, PH.D.

Clinical Neuropsychologist in Milwaukee, WI · enumerated 2006.

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

National Provider Identifier

1346347242

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Registry record

Entity type Individual (Type 1)

Name Dr. Roger D. Williams

Credential PH.D.

Sex Male

Practice address 5000 W National Ave, Zablocki Va Medical Center, Milwaukee, WI, 53295

Phone (414) 384-2000

Enumeration date Sep 20, 2006

Last updated in NPPES Sep 16, 2013

Taxonomy & licenses

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License 983P (AR) Secondary

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License 3042 (WI) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
990007081	Other	AR	RAILROAD MEDICARE
50874000010	Other	AR	QUALCHOICE
133649719	Medicaid	AR	-
5T814	Other	AR	BLUE CROSS
983P	Other	AR	CHAMPUS

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 specialty is Roger Williams?

Roger Williams is registered in NPPES with the primary taxonomy of Clinical Neuropsychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-09-16.