Diana Zellner, D.O.
NPI 1164876827 · Hospice and Palliative Medicine (Internal Medicine) Physician · Portland, OR
Enrolled with Medicare as Practitioner - Hospice/Palliative Care · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diana Zellner, D.O. is a Hospice and Palliative Medicine (Internal Medicine) Physician provider in Portland, OR (NPI 1164876827).
Provider details
- NPI number
- 1164876827
- Entity type
- Individual
- Primary specialty
- Hospice and Palliative Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- No
- License
- DO198502 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
37 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 20 | $171 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 17 | $145 |
Typical Medicare-allowed amounts for these services range $145–$171 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl | 48 | 24 |
| Gabapentin | 15 | — |
| Methylphenidate Hcl | 13 | — |
| Olanzapine | 13 | — |
| Methadone Hcl | 12 | — |
| Pregabalin | 12 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 1015 Nw 22nd AvePortland, OR 97210-3025Phone: (503) 413-6862Fax: (503) 225-6398
Registry dates
- Enumerated
- 2016-04-19
- Last updated
- 2024-10-03
- Certified
- 2024-10-03
Frequently asked questions
- What is Diana Zellner's NPI number?
- Diana Zellner's National Provider Identifier (NPI) is 1164876827, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diana Zellner's specialty?
- Diana Zellner is listed in the NPPES registry with a primary specialty of Hospice and Palliative Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Diana Zellner located?
- Diana Zellner's practice location on file with NPPES is 4805 Ne Glisan St Ste 11n, Portland, OR 97213-2933.
- What is Diana Zellner's phone number?
- The practice phone number listed in the NPPES registry for Diana Zellner is (503) 215-1350.
- Does Diana Zellner accept Medicare?
- Diana Zellner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diana Zellner's NPI active?
- Yes — Diana Zellner's NPI (1164876827) is active in the NPPES registry as of the last update on 2024-10-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.