NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Gerard R. Williams, PHD LP

Psychologist in Flint, MI · enumerated 2006.

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

National Provider Identifier

1821158817

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Registry record

Entity type Individual (Type 1)
Name Dr. Gerard R. Williams
Credential PHD LP
Sex Male
Practice address Flint, MI, 48532
Phone (810) 630-1152
Fax (810) 630-9107
Enumeration date Dec 11, 2006
Last updated in NPPES Jul 21, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 6301007038 (MI) Primary

Other identifiers

Identifier Type State Issuer
750910736 Other MI BLUE SHIELD OPC
0B51092 Other MI BLUE SHIELD

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

Is NPI 1821158817 active?
Yes, as of the latest NPPES snapshot, NPI 1821158817 is active (record last updated 2022-07-21).
How do I verify Gerard Williams's NPI record?
Cross-check NPI 1821158817 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.