Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Jillian O'Sullivan, BCBA

Behavior Analyst in Tinley Park, IL · enumerated 2015.

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

National Provider Identifier

1467817155

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Registry record

Entity type Individual (Type 1)

Name Mrs. Jillian O'Sullivan

Credential BCBA

Sex Female

Practice address 6775 Prosperi Dr, Tinley Park, IL, 60477

Phone (708) 429-1260

Enumeration date Dec 22, 2015

Last updated in NPPES Jan 17, 2018

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.

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Frequently asked questions

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.

What specialty is Jillian O'Sullivan?

Jillian O'Sullivan 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-01-17.