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

Ann M. Clark, BCBA

Q: What is the NPI number for Ann Clark?

The National Provider Identifier (NPI) for Ann Clark is 1780823351, a Type 1 (individual) record in the CMS NPPES registry.

Behavior Analyst in La Grange Highlands, IL · enumerated 2009.

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

National Provider Identifier

1780823351

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Registry record

Entity type Individual (Type 1)

Name Ann M. Clark

Credential BCBA

Sex Female

Practice address La Grange Highlands, IL, 60525

Phone (708) 334-7492

Enumeration date Feb 5, 2009

Last updated in NPPES Feb 5, 2009

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

Taxonomy & licenses

103K00000X Behavior Analyst Behavioral Health & Social Service Providers 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

Where does Ann Clark practice?

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

What is the NPI number for Ann Clark?

The National Provider Identifier (NPI) for Ann Clark is 1780823351, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-02-05.