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

Katherine Suzanne Winiarczyk, MD

Internal Medicine Physician in Ladysmith, WI · enumerated 2015.

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

National Provider Identifier

1841670726

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Registry record

Entity type Individual (Type 1)

Name Katherine Suzanne Winiarczyk

Credential MD

Sex Female

Practice address Ladysmith, WI, 54848

Phone (715) 532-2300

Enumeration date Jun 4, 2015

Last updated in NPPES Sep 22, 2025

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 66082-20 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

What is the NPI number for Katherine Winiarczyk?

The National Provider Identifier (NPI) for Katherine Winiarczyk is 1841670726, a Type 1 (individual) record in the CMS NPPES registry.

Where does Katherine Winiarczyk practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-22.