Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Katharine Courtney Clark-Keene

Behavior Analyst in Arlington Heights, IL · enumerated 2021.

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

National Provider Identifier

1255918637

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Registry record

Entity type Individual (Type 1)

Name Mrs. Katharine Courtney Clark-Keene

Sex Female

Practice address 3400 W Stonegate Blvd Ste 101-2109, Arlington Heights, IL, 60005

Phone (331) 241-6485

Enumeration date Mar 24, 2021

Last updated in NPPES Apr 16, 2021

Taxonomy & licenses

227800000X Certified Respiratory Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License BACB514668 (IL) Secondary

103K00000X Behavior Analyst Behavioral Health & Social Service Providers · License 1-21-48826 (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

Is NPI 1255918637 active?

Yes, as of the latest NPPES snapshot, NPI 1255918637 is active (record last updated 2021-04-16).

How do I verify Katharine Clark-Keene's NPI record?

Cross-check NPI 1255918637 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-04-16.