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Compare the published Medicare service mix of Ciara Catherine O'sullivan, M.D with clinicians in the same registry specialty: Medical Oncology (CMS).

ROCHESTER, MN · Exact areaEdit location

2024 published service data · 67 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Grace Mei Yee Choong, MD

Hematology/Oncology · Internal Medicine · Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
90%Service-mix similarityView profile →

Elizabeth J. Cathcart-Rake, M.D.

Hematology/Oncology · Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
89%Service-mix similarityView profile →

Zhaohui Jin, M.D.

Hematology/Oncology · Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
88%Service-mix similarityView profile →

Scott H Okuno, M.D.

Hematology/Oncology · Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
88%Service-mix similarityView profile →

Lance C. Pagliaro, M.D.

Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
87%Service-mix similarityView profile →

Julian R Molina, M.D.

Internal Medicine · Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
87%Service-mix similarityView profile →

Prema P Peethambaram, M.D.

Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
86%Service-mix similarityView profile →

Arkadiusz Zbigniew Dudek, M.D.

Hematology/Oncology · Internal Medicine · Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
85%Service-mix similarityView profile →

Amye J. Tevaarwerk, M.D.

Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
84%Service-mix similarityView profile →

Hao Xie, MD, PHD

Hematology/Oncology · Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
84%Service-mix similarityView profile →

Kathryn Jean Ruddy, MD MPH

Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
84%Service-mix similarityView profile →

Brittany Siontis, M.D.

Medical Oncology (CMS) · Rochester, MN

Shared published services
3 shared services · view billing descriptions
  • Injection of additional new drug or substance into vein (96375)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Administration of chemotherapy into vein, 1 hour or less (96413)
84%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.