John Denker, M.D.
Adult Medicine Physician · Portland, OR
John Denker, M.D. is an adult medicine physician with a practice address in Portland, Oregon, and NPI 1942201546, issued on Aug 3, 2005. Check the license (Oregon MD 12668, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- John Denker
- Credential
- M.D.
- Primary taxonomy
- Adult Medicine Physician 207QA0505X
- License number
- MD 12668 OR
Self-reported in NPPES; status is on the state search - Practice location
- 5622 SE 41St Ave, Portland, OR 97202
- Phone
- (503) 774-6929
- Enumerated
- Aug 3, 2005
- Record last updated
- Oct 16, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (503) 774-6924
- Medicaid ID
- 228700 OR
- Medicare enrollment
- Enrolled (PECOS I20100820000213); accepts Medicare assignment
- Medical or professional school
- Oregon Health Sciences University School Of Medicine, 1980
- Entity
- Type 1 · individual
8 nearest adult medicine physician records → All 27 in Oregon → Look up another NPI →
Verify John Denker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD 12668Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average adult medicine physician in 2024
7,357 Medicare Part D claims for 424 beneficiaries, against an average of 3,002 among the 1,307 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 329 claims were for opioids.
Most prescribed
- Atorvastatin Calcium335 claims
- Eliquis262 claims
- Furosemide258 claims
- Levothyroxine Sodium198 claims
- Potassium Chloride195 claims
- Oxycodone Hcl182 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.
Industry payments in 2024: $63.63
3 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 664 providers of this specialty with any payment received $1,405.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Marquis Clinical Services LLCMilwaukie, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Denker among 27 adult medicine physician records in Oregon
John Denker, M.D. is one of 27 adult medicine physician records with a practice address in Oregon. 41% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 41% of these records are
- In the CMS Doctors and Clinicians fileYes · 22% of these records are
- Record last updated2007 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QA0505X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Adult Medicine Physician providers in Oregon
There are 27 adult medicine physician records in Oregon.
All 27 in Oregon → Every provider in Portland → Adult Medicine Physician nationwide →
The 8 adult medicine physician records with the nearest ZIP codes
- Randell Jura, M.D.Portland, OR 972161104272921
- Frances Verzosa, M.D.Portland, OR 972201326199738
- Carolyn Chapman, M.D.Portland, OR 972251497765499
- Melissa Noble, DOPortland, OR 972251629109335
- Paul Vanbredavriesman, M.D.Gresham, OR 972331043453582
- Leta Callahan, MDWheeler, OR 971471154548881
- Harry Rinehart, M.D.Wheeler, OR 971471972579720
- Ben Douglas, M.D.Tillamook, OR 971411952527871
Common questions
What is John Denker, M.D.'s NPI number?
John Denker, M.D.'s National Provider Identifier (NPI) is 1942201546, issued on Aug 3, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John Denker, M.D. located?
The NPPES record lists a practice address at 5622 SE 41St Ave, Portland, OR, 97202. Phone: (503) 774-6929. Providers update this record themselves, so call before visiting.
How can I verify John Denker, M.D.'s license?
NPPES lists Oregon license number MD 12668, 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 John Denker, M.D. prescribe under Medicare Part D?
In 2024, John Denker, M.D. had 7,357 Medicare Part D claims for 424 beneficiaries; the average among adult medicine physician prescribers was 3,002. 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.