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

William Nason, M.S.

Clinical Psychologist in Grand Blanc, MI · enumerated 2007.

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

National Provider Identifier

1851513378

Verified

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Registry record

Entity type Individual (Type 1)

Name William Nason

Credential M.S.

Sex Male

Practice address Grand Blanc, MI, 48439

Phone (586) 263-8700

Enumeration date May 3, 2007

Last updated in NPPES Jul 28, 2015

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

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 6301003841 (MI) Primary

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 is the NPI number for William Nason?

The National Provider Identifier (NPI) for William Nason is 1851513378, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Nason practice?

The practice location on file with NPPES is in Grand Blanc, MI. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-07-28.