Katharine Won, MD
NPI 1902337058 · Family Medicine Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katharine Won, MD is a Family Medicine Physician provider in Seattle, WA (NPI 1902337058).
Provider details
- NPI number
- 1902337058
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- MD60958278 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
30 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Hemoglobin A1c Level83036 | 30 | $10 |
Typical Medicare-allowed amounts for these services range $10–$10 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 55 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 233 | 64 |
| Amlodipine Besylate | 122 | 42 |
| Losartan Potassium | 114 | 32 |
| Gabapentin | 70 | 18 |
| Lisinopril | 69 | 25 |
| Metoprolol Succinate | 66 | 15 |
| Metformin Hcl |
Practice location
Mailing address
Additional practice locations (3)
- 126 Auburn AveAuburn, WA 98002-5057Phone: (253) 735-0166
- 33431 13th Pl SFederal Way, WA 98003-6357Phone: (253) 874-7634
- 1401 Madison St Ste 100Seattle, WA 98104-1316Phone: (206) 386-6054
Registry dates
- Enumerated
- 2017-03-21
- Last updated
- 2021-06-04
- Certified
- 2021-06-04
Frequently asked questions
- What is Katharine Won's NPI number?
- Katharine Won's National Provider Identifier (NPI) is 1902337058, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katharine Won's specialty?
- Katharine Won is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Katharine Won located?
- Katharine Won's practice location on file with NPPES is 9245 Rainier Ave S, Seattle, WA 98118-5569.
- What is Katharine Won's phone number?
- The practice phone number listed in the NPPES registry for Katharine Won is (206) 722-8444.
- Does Katharine Won accept Medicare?
- Katharine Won is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katharine Won's NPI active?
- Yes — Katharine Won's NPI (1902337058) is active in the NPPES registry as of the last update on 2021-06-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.