Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Olivia Marie Clark

Q: What is the NPI number for Olivia Clark?

The National Provider Identifier (NPI) for Olivia Clark is 1023853108, a Type 1 (individual) record in the CMS NPPES registry.

Speech-Language Pathologist in Vernon Hills, IL · enumerated 2024.

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

National Provider Identifier

1023853108

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Registry record

Entity type Individual (Type 1)

Name Olivia Marie Clark

Sex Female

Practice address 1111 N Milwaukee Ave Unit 323, Vernon Hills, IL, 60061

Phone (714) 309-2019

Enumeration date Jun 28, 2024

Last updated in NPPES Nov 18, 2025

Taxonomy & licenses

235Z00000X Speech-Language Pathologist Speech, Language and Hearing Service Providers · License 0005771 (CO) Secondary

235Z00000X Speech-Language Pathologist Speech, Language and Hearing Service Providers · License 35244 (CA) Secondary

235Z00000X Speech-Language Pathologist Speech, Language and Hearing Service Providers · License 146.028763 (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 is the NPI number for Olivia Clark?

The National Provider Identifier (NPI) for Olivia Clark is 1023853108, a Type 1 (individual) record in the CMS NPPES registry.

Where does Olivia Clark practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-18.