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

Stefanie Jo O'Sullivan, RN

Family Nurse Practitioner in Waupaca, WI · enumerated 2019 · practices at Thedacare, Incorporated.

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

National Provider Identifier

1457812059

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Registry record

Entity type Individual (Type 1)

Name Stefanie Jo O'Sullivan

Credential RN

Sex Female

Practice address Waupaca, WI, 54981

Phone (920) 850-1205

Enumeration date Mar 27, 2019

Last updated in NPPES Jun 19, 2025

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

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 242332 (WI) Secondary

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 16736-33 (WI) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN credential

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 Stefanie O'Sullivan?

Stefanie O'Sullivan is registered in NPPES with the primary taxonomy of Family 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 2025-06-19.