Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Clifford Irving III, PHD

Psychologist in Grosse Pointe Woods, MI · enumerated 2006.

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

National Provider Identifier

1477669778

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Registry record

Entity type Individual (Type 1)

Name Dr. William Clifford Irving III

Credential PHD

Sex Male

Practice address 831 Woods Ln, Grosse Pointe Woods, MI, 48236

Phone (586) 443-4402

Fax (586) 443-4412

Enumeration date Aug 21, 2006

Last updated in NPPES Jun 8, 2026

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License WI002945 (MI) Primary

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

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

How do I verify William Irving's NPI record?

Cross-check NPI 1477669778 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1477669778 active?

Yes, as of the latest NPPES snapshot, NPI 1477669778 is active (record last updated 2026-06-08).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-08.