Diana Denton Zellner, D.O.
Hospice and Palliative Medicine (Internal Medicine) Physician · Portland, OR
Diana Denton Zellner, D.O. is a hospice and palliative medicine (internal medicine) physician with a practice address in Portland, Oregon, and NPI 1164876827, issued on Apr 19, 2016. Check the license (Oregon DO198502, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Diana Denton Zellner
- Credential
- D.O.
- Primary taxonomy
- Hospice and Palliative Medicine (Internal Medicine) Physician 207RH0002X
- License number
- DO198502 OR
Self-reported in NPPES; status is on the state search - Practice location
- 4805 NE Glisan St Ste 11N, Portland, OR 97213
- Phone
- (503) 215-1350
- Enumerated
- Apr 19, 2016
- Record last updated
- Oct 3, 2024
- Medicare enrollment
- Enrolled (PECOS I20200803000400); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hospice and palliative medicine (internal medicine) physician records → All 59 in Oregon → Look up another NPI →
Also registered at 4805 NE Glisan St Ste 11N
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rhezarie Mae Agtarap, NP-CGerontology Nurse Practitioner1023576659
- Hugo Akabane, M.D.Hematology (Internal Medicine) Physician1982010583
- Rebecca Armendariz, MDHospice and Palliative Medicine (Internal Medicine) Physician1073773818
- Asher Bar-Nes Caldwell, ANP-BC, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1699915355
- Richard Bell, MD, DDSOral & Maxillofacial Surgery (D.M.D.)1992704878
- Evelyn Brosnan, M.D.Hematology & Oncology Physician1497098941
Verify Diana Denton Zellner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license DO198502Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% fewer Medicare Part D claims than the average hospice and palliative medicine (internal medicine) physician in 2024
237 Medicare Part D claims for 57 beneficiaries, against an average of 741 among the 1,607 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 98 claims were for opioids.
Most prescribed
- Oxycodone Hcl48 claims
- Gabapentin15 claims
- Methylphenidate Hcl13 claims
- Olanzapine13 claims
- Methadone Hcl12 claims
- Pregabalin12 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 practice group's MIPS final score for 2023 (Medicare payment program): 86 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
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).
Diana Denton Zellner among 59 hospice and palliative medicine (internal medicine) physician records in Oregon
Diana Denton Zellner, D.O. is one of 59 hospice and palliative medicine (internal medicine) physician records with a practice address in Oregon. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 85% of them.
- NPI issued2016 · 85% of these records are older, 10% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2016 · median 2010 among the 40 with a school on file
- Record last updated2024 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0002X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospice and Palliative Medicine (Internal Medicine) Physician providers in Oregon
There are 59 hospice and palliative medicine (internal medicine) physician records in Oregon.
All 59 in Oregon → Every provider in Portland → Hospice and Palliative Medicine (Internal Medicine) Physician nationwide →
The 8 hospice and palliative medicine (internal medicine) physician records with the nearest ZIP codes
- Rebecca Armendariz, MDPortland, OR 972131073773818
- Frances Derook, M.D.Portland, OR 972131922098060
- Patricia Fogarty, M.D.Portland, OR 972131801180260
- Lena Hillenburg, MDPortland, OR 972131710042502
- Juan Iregui, MDPortland, OR 972131336191618
- Sharon Lissman, MDPortland, OR 972131205871993
- Elke Lowenkopf, MDPortland, OR 972131548323009
- Rachel Rackow, M.D.Portland, OR 972131285862565
Common questions
What is Diana Denton Zellner, D.O.'s NPI number?
Diana Denton Zellner, D.O.'s National Provider Identifier (NPI) is 1164876827, issued on Apr 19, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Diana Denton Zellner, D.O. located?
The NPPES record lists a practice address at 4805 NE Glisan St Ste 11N, Portland, OR, 97213. Phone: (503) 215-1350. Providers update this record themselves, so call before visiting.
How can I verify Diana Denton Zellner, D.O.'s license?
NPPES lists Oregon license number DO198502, 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 Diana Denton Zellner, D.O. prescribe under Medicare Part D?
In 2024, Diana Denton Zellner, D.O. had 237 Medicare Part D claims for 57 beneficiaries; the average among hospice and palliative medicine (internal medicine) physician prescribers was 741. Part D covers Medicare prescriptions only.
What is Diana Denton Zellner, D.O.'s MIPS final score?
The 2023 MIPS final score is 86 of 100, reported for the practice group. 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.