Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Courtney Erin Iwersen, APN-CNP

Nurse Practitioner in Elmhurst, IL · enumerated 2017.

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

National Provider Identifier

1164932653

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Registry record

Entity type Individual (Type 1)

Name Courtney Erin Iwersen

Credential APN-CNP

Sex Female

Practice address 133 E Brush Hill Rd Ste 310, Elmhurst, IL, 60126

Phone (331) 221-9003

Fax (331) 221-2743

Enumeration date Oct 10, 2017

Last updated in NPPES Apr 9, 2026

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209016723 (IL) Primary

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209016723 (IL) Secondary

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 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 Courtney Iwersen?

Courtney Iwersen is registered in NPPES with the primary taxonomy of Nurse Practitioner. 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 2026-04-09.