William J. Penn, M.D.
Emergency Medicine Physician · Yelm, WA
William J. Penn, M.D. is an emergency medicine physician with a practice address in Yelm, Washington, and NPI 1194771535, issued on May 26, 2006. Check the license (Washington MD00020401, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- William J. Penn
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- MD00020401 WA
Self-reported in NPPES; status is on the state search - Practice location
- 201 Tahoma Blvd, Yelm, WA 98597
- Phone
- (360) 458-7761
- Enumerated
- May 26, 2006
- Record last updated
- Sep 20, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicaid ID
- 1018621 WA
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,459 in Washington → Look up another NPI →
Also registered at 201 Tahoma Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William J. Penn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00020401Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average emergency medicine physician in 2024
16 Medicare Part D claims, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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.
William J. Penn among 1,459 emergency medicine physician records in Washington
William J. Penn, M.D. is one of 1,459 emergency medicine physician records with a practice address in Washington. 74% 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 3% of them.
- NPI issued2006 · 3% of these records are older, 55% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2013 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in Washington
There are 1,459 emergency medicine physician records in Washington.
All 1,459 in Washington → Every provider in Yelm → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Terry Moy-Brown, D.O.Battle Ground, WA 986041629383294
- Mikhail Podlog, D.O.Battle Ground, WA 986041558716746
- Perry Reding, DDS, MDCamas, WA 986071720087422
- Amir Nagavi, MDSouth Bend, WA 985861184885030
- Debra Slapper, MDSouth Bend, WA 985861386864643
- Thomas Belanger, M.D.Shelton, WA 985841922237395
- Roy Belville, MDShelton, WA 985841881640076
- Ella Cameron, M.DShelton, WA 985841083860209
Common questions
What is William J. Penn, M.D.'s NPI number?
William J. Penn, M.D.'s National Provider Identifier (NPI) is 1194771535, issued on May 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William J. Penn, M.D. located?
The NPPES record lists a practice address at 201 Tahoma Blvd, Yelm, WA, 98597. Phone: (360) 458-7761. Providers update this record themselves, so call before visiting.
How can I verify William J. Penn, M.D.'s license?
NPPES lists Washington license number MD00020401, 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 J. Penn, M.D. prescribe under Medicare Part D?
In 2024, William J. Penn, M.D. had 16 Medicare Part D claims; the average among emergency medicine physician prescribers was 226. 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.