Diego F. Diaz, MD
Family Medicine Physician · Portland, OR
Diego F. Diaz, MD is a family medicine physician with a practice address in Portland, Oregon, and NPI 1407019532, issued on Jul 9, 2008. Check the license (Oregon MD159017, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Diego F. Diaz
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- MD159017 OR
11014152A IN
Self-reported in NPPES; status is on the state search - Practice location
- 4920 N Interstate Ave, Portland, OR 97217
- Phone
- (503) 215-3300
- Enumerated
- Jul 9, 2008
- Record last updated
- Feb 4, 2022
- Fax
- (503) 215-3350
- Medicaid ID
- 500649902 OR
- Medicare enrollment
- Enrolled (PECOS I20121031000060); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,847 in Oregon → Look up another NPI →
Also registered at 4920 N Interstate Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Matthew Breeze, MDFamily Medicine Physician1083655609
- Vanessa Casillas, PSY.D.Clinical Psychologist1235432287
- Zhong Chen, MDFamily Medicine Physician1518609767
Verify Diego F. Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD159017Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average family medicine physician in 2024
308 Medicare Part D claims for 217 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 20 claims were for opioids.
Most prescribed
- Cefadroxil48 claims
- Doxycycline Monohydrate33 claims
- Albuterol Sulfate Hfa16 claims
- Hydrocodone-Acetaminophen15 claims
- Prednisone14 claims
- Cephalexin13 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: $28.78
1 payment: food and beverage; the largest payer was Takeda Pharmaceuticals U.S.A., Inc. The 55,478 providers of this specialty with any payment received $902.55 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
- Kaiser Foundation Health Plan OF The NorthwestClackamas, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Diego F. Diaz among 2,847 family medicine physician records in Oregon
Diego F. Diaz, MD is one of 2,847 family medicine physician records with a practice address in Oregon. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 55% of them.
- NPI issued2008 · 55% of these records are older, 41% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2002 · median 2009 among the 1,671 with a school on file
- Record last updated2022 · 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 Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
561 family medicine physician records list a practice address in Portland
They are 561 of the 42,088 NPPES records with a practice address in Portland, and 2,847 family medicine physician records in Oregon.
All 2,847 in Oregon → Every provider in Portland → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Matthew Breeze, MDPortland, OR 972171083655609
- Simon Chan, DOPortland, OR 972171841242195
- Shauna Ensminger, MDPortland, OR 972171619960002
- Gregory Freed, M.D.Portland, OR 972171346433042
- Monique Gedenk, MDPortland, OR 972171740226745
- Janel Guyette, M.D.Portland, OR 972171205990660
- Mary Frances Lowdermilk, M.D.Portland, OR 972171245453315
- Michael Miller, MDPortland, OR 972171104902659
Common questions
What is Diego F. Diaz, MD's NPI number?
Diego F. Diaz, MD's National Provider Identifier (NPI) is 1407019532, issued on Jul 9, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Diego F. Diaz, MD located?
The NPPES record lists a practice address at 4920 N Interstate Ave, Portland, OR, 97217. Phone: (503) 215-3300. Providers update this record themselves, so call before visiting.
How can I verify Diego F. Diaz, MD's license?
NPPES lists Oregon license number MD159017, 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 Diego F. Diaz, MD prescribe under Medicare Part D?
In 2024, Diego F. Diaz, MD had 308 Medicare Part D claims for 217 beneficiaries; 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.