Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Lily Wilczewski

Behavior Analyst in Plainfield, IL · enumerated 2022.

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

National Provider Identifier

1881339455

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Registry record

Entity type Individual (Type 1)

Name Lily Wilczewski

Sex Female

Practice address 11914 S Route 59 Ste 134, Plainfield, IL, 60585

Phone (815) 469-1500

Enumeration date Apr 28, 2022

Last updated in NPPES Nov 1, 2023

Taxonomy & licenses

103K00000X Behavior Analyst Behavioral Health & Social Service Providers · License 1-23-68907 (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.

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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 Lily Wilczewski?

Lily Wilczewski 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 2023-11-01.