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

Mrs. Diane Katherine Osepek, PHARMACIST

Q: What is the NPI number for Diane Osepek?

The National Provider Identifier (NPI) for Diane Osepek is 1275882219, a Type 1 (individual) record in the CMS NPPES registry.

Pharmacist in Naperville, IL · enumerated 2012.

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

National Provider Identifier

1275882219

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Registry record

Entity type Individual (Type 1)

Name Mrs. Diane Katherine Osepek

Credential PHARMACIST

Sex Female

Practice address Naperville, IL, 60563

Phone (630) 983-4022

Enumeration date Sep 6, 2012

Last updated in NPPES Sep 6, 2012

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

Taxonomy & licenses

183500000X Pharmacist Pharmacy Service Providers · License 051036013 (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

Where does Diane Osepek practice?

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

What is the NPI number for Diane Osepek?

The National Provider Identifier (NPI) for Diane Osepek is 1275882219, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-09-06.