William Alex McFadden, MD
Family Medicine Physician · Seattle, WA
William Alex McFadden, MD is a family medicine physician with a practice address in Seattle, Washington, and NPI 1366478448, issued on Jun 23, 2006. Check the license (Washington MD00038337, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- William Alex McFadden
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD00038337 WA
Self-reported in NPPES; status is on the state search - Practice location
- 510 Boren Ave N, Seattle, WA 98109
- Phone
- (206) 320-5200
- Enumerated
- Jun 23, 2006
- Record last updated
- Oct 28, 2022
- Fax
- (206) 320-5202
- Medicaid ID
- 8253064 WA
- Medicare enrollment
- Enrolled (PECOS I20040505000897); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical School At Houston, 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 5,534 in Washington → Look up another NPI →
Also registered at 510 Boren Ave N
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Alex McFadden in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00038337Check 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 family medicine physician in 2024
747 Medicare Part D claims for 72 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 17 claims were for opioids.
Most prescribed
- Atorvastatin Calcium70 claims
- Tamsulosin Hcl34 claims
- Ozempic29 claims
- Gabapentin28 claims
- Lisinopril25 claims
- Amlodipine Besylate24 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
- Swedish Health ServicesSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Alex McFadden among 5,534 family medicine physician records in Washington
William Alex McFadden, MD is one of 5,534 family medicine physician records with a practice address in Washington. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 58% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1995 · median 2009 among the 3,294 with a school on file
- Record last updated2022 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
871 family medicine physician records list a practice address in Seattle
They are 871 of the 41,956 NPPES records with a practice address in Seattle, and 5,534 family medicine physician records in Washington.
All 5,534 in Washington → Every provider in Seattle → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Clara Chan, MDSeattle, WA 981091740364462
- Arti Chandra, MDSeattle, WA 981091295819910
- Julie Craig, MDSeattle, WA 981091437362837
- Bruce Gardner, MDSeattle, WA 981091194815480
- Mark Johnson, MDSeattle, WA 981091528122751
- Alison Kneisl, MDSeattle, WA 981091578640108
- Tina Neogi, MDSeattle, WA 981091336399419
- Kimberly Reinertsen, M.D.Seattle, WA 981091730318999
Common questions
What is William Alex McFadden, MD's NPI number?
William Alex McFadden, MD's National Provider Identifier (NPI) is 1366478448, issued on Jun 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Alex McFadden, MD located?
The NPPES record lists a practice address at 510 Boren Ave N, Seattle, WA, 98109. Phone: (206) 320-5200. Providers update this record themselves, so call before visiting.
How can I verify William Alex McFadden, MD's license?
NPPES lists Washington license number MD00038337, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Alex McFadden, MD prescribe under Medicare Part D?
In 2024, William Alex McFadden, MD had 747 Medicare Part D claims for 72 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.