Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Brian J Leahy, PHD

Clinical Neuropsychologist in Elk Grove Village, IL · enumerated 2006.

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

National Provider Identifier

1679505358

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Registry record

Entity type Individual (Type 1)

Name Brian J Leahy

Credential PHD

Sex Male

Practice address 800 Biesterfield Rd, Eberle Bldg, Suite 610, Elk Grove Village, IL, 60007

Phone (847) 981-3630

Fax (847) 981-3633

Enumeration date Jul 6, 2006

Last updated in NPPES Mar 22, 2021

Taxonomy & licenses

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License 071-006516 (IL) Primary

103T00000X Psychologist Behavioral Health & Social Service Providers 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

How do I verify Brian Leahy's NPI record?

Cross-check NPI 1679505358 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1679505358 active?

Yes, as of the latest NPPES snapshot, NPI 1679505358 is active (record last updated 2021-03-22).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-22.