Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Rebecca Lynn Deffner, NP

Family Nurse Practitioner in Mosinee, WI · enumerated 2012.

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

National Provider Identifier

1578819256

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Registry record

Entity type Individual (Type 1)

Name Mrs. Rebecca Lynn Deffner

Credential NP

Sex Female

Practice address 1881 County Trunk Xx, Mosinee, WI, 54455

Phone (715) 355-4040

Enumeration date Jul 31, 2012

Last updated in NPPES Jul 31, 2012

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 2012007838 (WI) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP 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.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Rebecca Deffner's NPI record?

Cross-check NPI 1578819256 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1578819256 active?

Yes, as of the latest NPPES snapshot, NPI 1578819256 is active (record last updated 2012-07-31).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-07-31.