Joshua M. Walker, MD/PHD
Radiation Oncology Physician · Portland, OR
Joshua M. Walker, MD/PHD is a radiation oncology physician with a practice address in Portland, Oregon, and NPI 1962848655, issued on May 21, 2013. Check the license (Oregon MD189059, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Joshua M. Walker
- Credential
- MD/PHD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- MD189059 OR
Self-reported in NPPES; status is on the state search - Practice location
- 3181 SW Sam Jackson Park RD # Kpv4, Portland, OR 97239
- Phone
- (503) 494-8756
- Enumerated
- May 21, 2013
- Record last updated
- Oct 1, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20180628001355); accepts Medicare assignment
- Medical or professional school
- Oregon Health Sciences University School Of Medicine, 2013
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 115 in Oregon → Look up another NPI →
Verify Joshua M. Walker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD189059Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average radiation oncology physician in 2024
35 Medicare Part D claims for 29 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Dexamethasone19 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.
The MIPS final score for 2023 (Medicare payment program): 97.8 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- University Professional ServicesPortland, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joshua M. Walker among 115 radiation oncology physician records in Oregon
Joshua M. Walker, MD/PHD is one of 115 radiation oncology 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 2013, is newer than 72% of them.
- NPI issued2013 · 72% of these records are older, 26% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2013 · median 2006 among the 85 with a school on file
- Record last updated2020 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Oregon
There are 115 radiation oncology physician records in Oregon.
All 115 in Oregon → Every provider in Portland → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Eric Chang, M.D.Portland, OR 972391114304870
- Lanceford Chong, MDPortland, OR 972391821001736
- Aaron Grossberg, MD, PHDPortland, OR 972391164775334
- Mohammad Hissourou, MDPortland, OR 972391538664057
- John Holland, MDPortland, OR 972391104834662
- Arthur Hung, MDPortland, OR 972391609881119
- Jenna Kahn, M.D.Portland, OR 972391366855793
- Nima Nabavizadeh, MDPortland, OR 972391538453741
Common questions
What is Joshua M. Walker, MD/PHD's NPI number?
Joshua M. Walker, MD/PHD's National Provider Identifier (NPI) is 1962848655, issued on May 21, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Joshua M. Walker, MD/PHD located?
The NPPES record lists a practice address at 3181 SW Sam Jackson Park RD # Kpv4, Portland, OR, 97239. Phone: (503) 494-8756. Providers update this record themselves, so call before visiting.
How can I verify Joshua M. Walker, MD/PHD's license?
NPPES lists Oregon license number MD189059, 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 Joshua M. Walker, MD/PHD prescribe under Medicare Part D?
In 2024, Joshua M. Walker, MD/PHD had 35 Medicare Part D claims for 29 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is Joshua M. Walker, MD/PHD's MIPS final score?
The 2023 MIPS final score is 97.8 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.