Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Clare R Arentsen, FNP-BC

Nurse Practitioner in Breese, IL · enumerated 2020.

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

National Provider Identifier

1225645690

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Registry record

Entity type Individual (Type 1)

Name Clare R Arentsen

Credential FNP-BC

Sex Female

Practice address 9401 Holy Cross Ln Ste 112, Breese, IL, 62230

Phone (618) 526-7271

Enumeration date Sep 29, 2020

Last updated in NPPES Dec 8, 2023

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209022801 (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

What is the NPI number for Clare Arentsen?

The National Provider Identifier (NPI) for Clare Arentsen is 1225645690, a Type 1 (individual) record in the CMS NPPES registry.

Where does Clare Arentsen practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-12-08.