Katherine Ziwisky
Physician Assistant · Renton, WA
Katherine Ziwisky is a physician assistant with a practice address in Renton, Washington, and NPI 1811399660, issued on Sep 24, 2014. Check the license (Washington PA61249152, as entered in NPPES) with the Washington board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Katherine Ziwisky
- Primary taxonomy
- Physician Assistant 363A00000X
- License numbers
- PA61249152 WA
53336 CA
085005136 IL
Self-reported in NPPES; status is on the state search - Practice location
- 4033 Talbot RD S Ste 570, Renton, WA 98055
- Phone
- (425) 690-3487
- Enumerated
- Sep 24, 2014
- Record last updated
- Apr 25, 2022
- Fax
- (425) 690-9087
- Medicare enrollment
- Enrolled (PECOS I20220502001060); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 3,718 in Washington → Look up another NPI →
Also registered at 4033 Talbot RD S Ste 570
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Michael Hori, MDInfectious Disease Physician1205918208
- Yen-Tsun Lai, M.D.Geriatric Medicine (Internal Medicine) Physician1790727535
Verify Katherine Ziwisky in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Washington board licenses this profession
Search for license PA61249152Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average physician assistant in 2024
175 Medicare Part D claims for 54 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 34% of claims.
Most prescribed
- Vemlidy23 claims
- Biktarvy19 claims
- Amoxicillin-Clavulanate Potass15 claims
- Methenamine Hippurate14 claims
- Cephalexin12 claims
- Doxycycline Hyclate12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Valley Medical Group-RentonCovington, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Ziwisky among 3,718 physician assistant records in Washington
Katherine Ziwisky is one of 3,718 physician assistant records with a practice address in Washington. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 44% of them.
- NPI issued2014 · 44% of these records are older, 51% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2014 · median 2017 among the 2,460 with a school on file
- Record last updated2022 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
57 physician assistant records list a practice address in Renton
They are 57 of the 3,147 NPPES records with a practice address in Renton, and 3,718 physician assistant records in Washington.
All 3,718 in Washington → Every provider in Renton → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Babylyn Aspuria, PA-CRenton, WA 980551336531011
- Peter Dammen, PARenton, WA 980551972823094
- Laura Ganhs, PA-CRenton, WA 980551952421794
- Kimberlee Gold, PA-CRenton, WA 980551548510258
- Lisa Hershner, PA-CRenton, WA 980551699133173
- Andrew Huntley, PA-CRenton, WA 980551578931325
- Christina Jander, PA-CRenton, WA 980551043529985
- Marianne Johnston, PA-CRenton, WA 980551871724658
Common questions
What is Katherine Ziwisky's NPI number?
Katherine Ziwisky's National Provider Identifier (NPI) is 1811399660, issued on Sep 24, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Ziwisky located?
The NPPES record lists a practice address at 4033 Talbot RD S Ste 570, Renton, WA, 98055. Phone: (425) 690-3487. Providers update this record themselves, so call before visiting.
How can I verify Katherine Ziwisky's license?
NPPES lists Washington license number PA61249152, as entered by the provider. Search the Washington board that licenses this profession; the NPPES record confirms identity only.
How much does Katherine Ziwisky prescribe under Medicare Part D?
In 2024, Katherine Ziwisky had 175 Medicare Part D claims for 54 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.