William Lionel Loker, M.D.
Emergency Medicine Physician · Portland, OR
William Lionel Loker, M.D. is an emergency medicine physician with a practice address in Portland, Oregon, and NPI 1952635344, issued on Oct 1, 2009. Check the license (Oregon MD171850, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- William Lionel Loker
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- MD171850 OR
Self-reported in NPPES; status is on the state search - Practice location
- 3181 SW Sam Jackson Park RD, Portland, OR 97239
- Phone
- (503) 494-8311
- Enumerated
- Oct 1, 2009
- Record last updated
- Oct 21, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160606001821); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,079 in Oregon → Look up another NPI →
Also registered at 3181 SW Sam Jackson Park RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alex AamodtCritical Care Medicine Registered Nurse1154257590
- Jefferson Abaricia, MD, PHDStudent in an Organized Health Care Education/Training Program1073215711
- Kenneth Abbey, MDAnesthesiology Physician1588779342
- Matthew Abbott, PA-CMedical Physician Assistant1154738003
- Ayah Abdelsalam Megahed, MD, MSCVascular & Interventional Radiology Physician1023503596
- Obada Abdulrazzak, MDStudent in an Organized Health Care Education/Training Program1598567430
Verify William Lionel Loker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD171850Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
39% fewer Medicare Part D claims than the average emergency medicine physician in 2024
137 Medicare Part D claims for 105 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 22 claims were for opioids.
Most prescribed
- Cephalexin14 claims
- Hydrocodone-Acetaminophen11 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
- Providence Health And Services - OregonPortland, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Lionel Loker among 1,079 emergency medicine physician records in Oregon
William Lionel Loker, M.D. is one of 1,079 emergency medicine physician records with a practice address in Oregon. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 55% of them.
- NPI issued2009 · 55% of these records are older, 43% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated2009 · median 2013 among the 557 with a school on file
- Record last updated2020 · 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 207P00000X and a Oregon 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 Oregon
There are 1,079 emergency medicine physician records in Oregon.
All 1,079 in Oregon → Every provider in Portland → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- James Bryan, MD, PHDPortland, OR 972391083618524
- Esther Choo, MDPortland, OR 972391598746166
- Mohamud Daya, MD, M SPortland, OR 972391629073895
- Jermaine Foster, MDPortland, OR 972391417925199
- William Goodhue, MDPortland, OR 972391316976905
- Jerris Hedges, MD, MS, MMMPortland, OR 972391972506301
- Brandon Horowitz, M.D.Portland, OR 972391720082357
- Richard Ismach, MDPortland, OR 972391780688556
Common questions
What is William Lionel Loker, M.D.'s NPI number?
William Lionel Loker, M.D.'s National Provider Identifier (NPI) is 1952635344, issued on Oct 1, 2009. An NPI identifies a provider in billing; it is not a license.
Where is William Lionel Loker, M.D. located?
The NPPES record lists a practice address at 3181 SW Sam Jackson Park RD, Portland, OR, 97239. Phone: (503) 494-8311. Providers update this record themselves, so call before visiting.
How can I verify William Lionel Loker, M.D.'s license?
NPPES lists Oregon license number MD171850, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Lionel Loker, M.D. prescribe under Medicare Part D?
In 2024, William Lionel Loker, M.D. had 137 Medicare Part D claims for 105 beneficiaries; 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.