Percy Po-Yih Lee, M.D.
Radiation Oncology (CMS) · Irvine, CA
Shared published services3 shared services · view billing descriptions
93%Service-mix similarity~13.3 milesView profile →
Similar work.
More providers to explore.
Compare the published Medicare service mix of Paul Matthew Mandelin, D.O. with clinicians in the same registry specialty: Radiation Oncology (CMS).
CORONA, CA · 25 milesEdit location
Within 25 miles · Approximate ZIP-area distance
Approximate straight-line distances between ZIP-area centers; a city search starts from the average of its ZIP centers. Uses the primary reported practice ZIP, not an exact office address or driving distance. Records without matched coordinates are excluded. How distance works
2024 published service data · 55 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.
Aaron Benjamin Simon, MD, PHD
Radiation Oncology (CMS) · Orange, CA
Shared published services3 shared services · view billing descriptions
93%Service-mix similarity~19.1 milesView profile →
Venita Lai Williams, MD
Radiation Oncology (CMS) · Orange, CA
Shared published services3 shared services · view billing descriptions
92%Service-mix similarity~19.1 milesView profile →
Sean S. Szeja, M.D.
Radiation Oncology (CMS) · Upland, CA
Shared published services3 shared services · view billing descriptions
92%Service-mix similarity~19.0 milesView profile →
Sri G Gorty, M.D.
Radiation Oncology (CMS) · Pomona, CA
Shared published services3 shared services · view billing descriptions
91%Service-mix similarity~18.9 milesView profile →
Jeremy Phillip Harris, MD
Radiation Oncology (CMS) · Orange, CA
Shared published services3 shared services · view billing descriptions
90%Service-mix similarity~19.1 milesView profile →
Robert Blair Ash, MD
Radiation Oncology (CMS) · Orange, CA
Shared published services3 shared services · view billing descriptions
88%Service-mix similarity~19.1 milesView profile →
Afshin Rashtian, MD
Radiation Oncology (CMS) · Riverside, CA
Shared published services3 shared services · view billing descriptions
87%Service-mix similarity~14.3 milesView profile →
Amanda Schwer, MD
Radiation Oncology (CMS) · Irvine, CA
Shared published services3 shared services · view billing descriptions
87%Service-mix similarity~13.3 milesView profile →
William W Chou, MD
Radiation Oncology (CMS) · Mission Viejo, CA
Shared published services3 shared services · view billing descriptions
86%Service-mix similarity~17.7 milesView profile →
Erin Healy, MD
Radiation Oncology (CMS) · Orange, CA
Shared published services3 shared services · view billing descriptions
86%Service-mix similarity~19.1 milesView profile →
Andrew Zhang, MD
Radiation Oncology (CMS) · Laguna Hills, CA
Shared published services3 shared services · view billing descriptions
83%Service-mix similarity~19.9 milesView 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 approximate distance 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.