NPI registry status
Active
2026 NPPES data Hematology & Oncology Physician NPI 1972729044 DO
Verify on CMS → Robert Ellis, DO
Hematology & Oncology Physician in Portland, Oregon.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 11,215 in Hematology & Oncology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
33
Medicare Part D claims · 20 beneficiaries · Hematology & Oncology Physician avg: 847
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Robert Ellis, DO filed 33 Medicare Part D claims in 2023 as a Hematology & Oncology Physician in Portland, Oregon.
- 33
- Part D claims, 2023
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Robert Ellis, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
33 0th percentile higher than 0% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Robert Ellis, DO practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Robert Ellis, DO?
Quality data not reportedPrimary specialty
Hematology & Oncology Physician
Medicare Part D claims
33 96% vs specialty avg
Specialty distribution in Oregon
How Hematology & Oncology Physician compares to other specialties among Oregon providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Hematology & Oncology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Robert Ellis, DO appears in the CMS NPPES registry as a Hematology & Oncology Physician provider holding DO credentials at 3600 N INTERSTATE AVE, Portland, OR, 97227, with a listed phone of (503) 331-6500. NPI 1972729044 was issued on 04/17/2007.
Medicare Part D records for calendar year 2023 show 33 prescription claims written by this provider, covering 20 Medicare beneficiaries and totaling roughly $46K in drug spend.
Hematology & Oncology Physician is a mid-sized specialty nationwide, with 11,215 enrolled providers across 54 states and an average of 847 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1972729044 |
|---|---|
| Specialty | Hematology & Oncology Physician |
| Credentials | DO |
| Gender | Male |
| NPI Issued | 04/17/2007 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
33
Total Claims
$46K
Total Drug Cost
20
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 62
- Total Day Supply
- 1,764
- Generic Drug Cost
- $722
Patient Demographics
- Average Patient Age
- 73.3 years
- Avg HCC Risk Score
- 1.68
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Tamoxifen Citrate | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hematology & Oncology Physician Overview
How Robert Ellis, DO fits within the Hematology & Oncology Physician landscape nationally.
11,215
Hematology & Oncology Physician Providers in US
54
States with Hematology & Oncology Physician
847
Avg Claims per Provider
Robert Ellis, DO's 33 claims are below the specialty average of 847.
Nearby Hematology & Oncology Physician Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Ellis.
Dr. Gerald Ahmann
MD
Medford, OR
Dr. Jay Andersen
M.D.
Portland, OR
Dr. Molly Andreason
MD
Portland, OR
Dr. Pragathi Balakrishna
M.D.
Medford, OR
Dr. Christine Barnett
M.D.
Portland, OR
Compare Hematology & Oncology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Oregon medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hematology & Oncology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
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Step-by-step guide to choosing a provider
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Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Oregon
Frequently Asked Questions
What is Robert Ellis, DO's specialty? ▼
Robert Ellis, DO specializes in Hematology & Oncology Physician and practices in Portland, Oregon. Credentials: DO.
How much does Robert Ellis, DO prescribe under Medicare Part D? ▼
In 2023, Robert Ellis, DO wrote 33 Medicare Part D claims totaling $46K in drug costs for 20 beneficiaries.
Where is Robert Ellis, DO located? ▼
Robert Ellis, DO is located at 3600 N INTERSTATE AVE, Portland, OR, 97227. Phone: (503) 331-6500.
What is Robert Ellis, DO's NPI number? ▼
Robert Ellis, DO's National Provider Identifier (NPI) is 1972729044, issued on 04/17/2007.
How many Hematology & Oncology Physician providers are there in the US? ▼
There are 11,215 Hematology & Oncology Physician providers across 54 states in the US. The average Hematology & Oncology Physician provider writes 847 Medicare Part D claims per year.
What drugs does Robert Ellis, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Robert Ellis, DO's most frequently prescribed drugs include Tamoxifen Citrate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Robert Ellis, DO accept Medicare? ▼
Robert Ellis, DO appears in CMS Medicare data with 33 Part D claims and 20 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Robert Ellis, DO's credentials? ▼
Robert Ellis, DO's NPI is 1972729044 with credentials DO. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.