Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Glenn Weiss, LCSW

Q: What is the NPI number for Glenn Weiss?

The National Provider Identifier (NPI) for Glenn Weiss is 1578674222, a Type 1 (individual) record in the CMS NPPES registry.

Clinical Social Worker in Buffalo Grove, IL · enumerated 2006.

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

National Provider Identifier

1578674222

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Registry record

Entity type Individual (Type 1)

Name Mr. Glenn Weiss

Credential LCSW

Sex Male

Practice address 1401 Mchenry Rd, Suite #122, Buffalo Grove, IL, 60089

Phone (847) 913-0393

Fax (847) 913-9630

Enumeration date Aug 31, 2006

Last updated in NPPES Jul 21, 2024

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 149003833 (IL) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW 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

What is the NPI number for Glenn Weiss?

The National Provider Identifier (NPI) for Glenn Weiss is 1578674222, a Type 1 (individual) record in the CMS NPPES registry.

Where does Glenn Weiss practice?

The practice location on file with NPPES is in Buffalo Grove, IL. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-07-21.