Mary Ellen Walker, MD
Family Medicine Physician · Vashon, WA
Mary Ellen Walker, MD is a family medicine physician with a practice address in Vashon, Washington, and NPI 1003324393, issued on Jan 20, 2018. Check the license (Washington 000020165, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Mary Ellen Walker
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 000020165 WA
Self-reported in NPPES; status is on the state search - Practice location
- 21405 Monument RD SW, Vashon, WA 98070
- Phone
- (206) 463-6300
- Enumerated
- Jan 20, 2018
- Record last updated
- Jan 20, 2018 (not updated in 8 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 5,534 in Washington → Look up another NPI →
Verify Mary Ellen Walker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license 000020165Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average family medicine physician in 2024
99 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 13 claims were for opioids.
Most prescribed
- Alprazolam14 claims
- Hydrocodone-Acetaminophen13 claims
- Citalopram Hbr12 claims
- Lisinopril12 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.
Mary Ellen Walker among 5,534 family medicine physician records in Washington
Mary Ellen Walker, 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 2018, is newer than 82% of them.
- NPI issued2018 · 82% of these records are older, 15% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2018 · 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).
11 family medicine physician records list a practice address in Vashon
They are 11 of the 218 NPPES records with a practice address in Vashon, and 5,534 family medicine physician records in Washington.
All 5,534 in Washington → Every provider in Vashon → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Caroline Brinkley, MDVashon, WA 980701457463028
- Katherine Burke, APRN FNP-CVashon, WA 980701417876236
- Scott Chaffin, D.O.Vashon, WA 980701205891637
- Thomas Erdmann, MDVashon, WA 980701801838040
- Kim Farrell, MDVashon, WA 980701306880430
- Gail Fulton, M.D.Vashon, WA 980701992748024
- Jeffrey Hanspetersen, MDVashon, WA 980701437183928
- Megan Hirsh, M.D.Vashon, WA 980701104288133
Common questions
What is Mary Ellen Walker, MD's NPI number?
Mary Ellen Walker, MD's National Provider Identifier (NPI) is 1003324393, issued on Jan 20, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Mary Ellen Walker, MD located?
The NPPES record lists a practice address at 21405 Monument RD SW, Vashon, WA, 98070. Phone: (206) 463-6300. Providers update this record themselves, so call before visiting.
How can I verify Mary Ellen Walker, MD's license?
NPPES lists Washington license number 000020165, 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 Mary Ellen Walker, MD prescribe under Medicare Part D?
In 2024, Mary Ellen Walker, MD had 99 Medicare Part D claims; 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.