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

Dr. William Leslie Harshman, PH.D, LMSW, LLP, CAC

Clinical Psychologist in Grand Blanc, MI · enumerated 2006.

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

National Provider Identifier

1821106675

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Registry record

Entity type Individual (Type 1)

Name Dr. William Leslie Harshman

Credential PH.D, LMSW, LLP, CAC

Sex Male

Practice address Grand Blanc, MI, 48439

Phone (810) 695-0055

Fax (810) 695-6813

Enumeration date Aug 29, 2006

Last updated in NPPES Sep 11, 2025

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

Taxonomy & licenses

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 6401007572 (MI) Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 6301007032 (MI) Primary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 6801066034 (MI) Secondary

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.

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Frequently asked questions

Where does William Harshman practice?

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

What is the NPI number for William Harshman?

The National Provider Identifier (NPI) for William Harshman is 1821106675, 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 2025-09-11.