Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Katherine Ziwisky

Physician Assistant in Renton, WA · enumerated 2014.

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

National Provider Identifier

1811399660

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Registry record

Entity type Individual (Type 1)

Name Katherine Ziwisky

Sex Female

Practice address 4033 Talbot Rd S Ste 570, Renton, WA, 98055

Phone (425) 690-3487

Fax (425) 690-9087

Enumeration date Sep 24, 2014

Last updated in NPPES Apr 25, 2022

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 085005136 (IL) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 53336 (CA) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA61249152 (WA) 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 Katherine Ziwisky?

The National Provider Identifier (NPI) for Katherine Ziwisky is 1811399660, a Type 1 (individual) record in the CMS NPPES registry.

Where does Katherine Ziwisky practice?

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

Other providers at this practice address

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Yen-Tsun Lai Geriatric Medicine (Internal Medicine) Physician · Renton, WA NPI 1790727535 Michael Hori Infectious Disease Physician · Renton, WA NPI 1205918208 Michele Despreaux Internal Medicine Physician · Renton, WA NPI 1346326147 Michelle Rodgers Medical Physician Assistant · Renton, WA NPI 1043456684 Amanda Casto Infectious Disease Physician · Renton, WA NPI 1497012090 Sarah Hillebrand Family Nurse Practitioner · Renton, WA NPI 1740646389 Fernando Casado Castillo Infectious Disease Physician · Renton, WA NPI 1528411774 Lindsay Nofziger Nurse Practitioner · Renton, WA NPI 1306365598

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-04-25.