Katherine Ziwisky
NPI 1811399660ActiveIndividual· Physician Assistant· Renton, WA
Physician Assistant with Valley Medical Group-Renton, practicing in Renton, Washington. Their prescriptions cost Medicare Part D more than their services did: $263,504 for 175 claims, against $14,410 paid for services in 2024. Astellas Pharma US Inc reported $29.42 in payments in 2025, mostly food and beverage. Lists Valley Medical Center as a hospital affiliation.
Overview
| NPI | 1811399660 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | No |
| NPI issued | Sep 24, 2014 |
| Last updated in NPPES | Apr 25, 2022 |
| Certified by provider | Apr 25, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | PA61249152 | WA |
| Physician Assistant | 363A00000X | 085005136 | IL |
| Physician Assistant | 363A00000X | 53336 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Physician Assistant (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 111 |
|---|---|
| Services billed | 229 across 12 procedure codes |
| Paid by Medicare | $14,410 |
Part D prescriptions in 2024
| Prescriptions (claims) | 175 · 190 30-day fills |
|---|---|
| Patients | 54 |
| Total drug cost | $263,504 |
| Generic share | 66% of claims |
Education and affiliations
| Graduation year | 2014 |
|---|---|
| Medicare specialty | Physician Assistant |
| Telehealth | Offers telehealth |
Medical group
- Valley Medical Group-RentonCovington, WA · 411 clinicians
Hospital affiliation
- Valley Medical CenterRenton, WA
Industry payments (Open Payments)
- 2025$29.42 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astellas Pharma US Inc | $29.42 | 1 |
What the 2025 payments were for
- Food and Beverage$29.42 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 61 physician assistants in Renton · All physician assistants in Washington