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Compare the published Medicare service mix of Diana Denton Zellner, D.O. with clinicians in the same registry specialty: Hospice/Palliative Care · Internal Medicine (CMS).

PORTLAND, OR · Exact areaEdit location

2024 published service data · 18 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Juan C Iregui, MD

Hospice/Palliative Care (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
73%Service-mix similarityView profile →

Eric Roeland, MD

Medical Oncology (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
43%Service-mix similarityView profile →

Rachel Rackow, M.D.

Hospice/Palliative Care · Internal Medicine (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
42%Service-mix similarityView profile →

Jason Allen Webb, M.D.

Hospice/Palliative Care (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
41%Service-mix similarityView profile →

Lena K Hillenburg, MD

Hospice/Palliative Care · Internal Medicine (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
39%Service-mix similarityView profile →

Patricia Fogarty, M.D.

Hospice/Palliative Care · Internal Medicine (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
39%Service-mix similarityView profile →

Benjamin M Ware, MD

Internal Medicine (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
38%Service-mix similarityView profile →

Sharon F Lissman, MD

Family Practice · Internal Medicine (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
36%Service-mix similarityView profile →

Briana Nicole Ketterer Revoal, MD

Hospice/Palliative Care · Hospitalist (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
35%Service-mix similarityView profile →

Elke P Lowenkopf, MD

Hospice/Palliative Care (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
35%Service-mix similarityView profile →

Katie Heintz Stowers, DO

Hematology/Oncology · Hospice/Palliative Care (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
34%Service-mix similarityView profile →

Frances A Derook, M.D.

Hospice/Palliative Care · Internal Medicine (CMS) · Portland, OR

Shared published services
1 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
34%Service-mix similarityView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in NPI order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.