Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Steven Walker, PH. D.

Clinical Psychologist in New Orleans, LA · enumerated 2007.

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

National Provider Identifier

1427172519

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Registry record

Entity type Individual (Type 1)

Name Dr. William Steven Walker

Credential PH. D.

Sex Male

Practice address 3450 Chestnut St, New Orleans, LA, 70115

Phone (504) 344-2674

Fax (504) 412-1530

Enumeration date Mar 16, 2007

Last updated in NPPES Apr 23, 2009

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 1037 (LA) 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
1410063	Medicaid	LA	-

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 does William Walker practice?

The practice location on file with NPPES is in New Orleans, LA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Walker?

The National Provider Identifier (NPI) for William Walker is 1427172519, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-04-23.