Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dexter Ray Grzyb

Behavior Analyst in Lincolnwood, IL · enumerated 2026.

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

National Provider Identifier

1013842608

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Registry record

Entity type Individual (Type 1)

Name Dexter Ray Grzyb

Sex Male

Practice address 6500 N Lincoln Ave, Lincolnwood, IL, 60712

Phone (630) 465-3963

Enumeration date Jun 15, 2026

Last updated in NPPES Jun 15, 2026

Taxonomy & licenses

103K00000X Behavior Analyst Behavioral Health & Social Service Providers · License BACB1468407 (IL) 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 specialty is Dexter Grzyb?

Dexter Grzyb is registered in NPPES with the primary taxonomy of Behavior Analyst. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-15.