A DIFFERENT WAY TO EXPLORE

Similar work.
More providers to explore.

Compare the published Medicare service mix of Steven Hartzman, M.D. with clinicians in the same registry specialty: Diagnostic Radiology · Interventional Radiology (CMS).

SANTA BARBARA, CA · Exact areaEdit location

2024 published service data · 49 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

John Patrick Wheelock, M.D.

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
83%Service-mix similarityView profile →

Thomas C. Daughters, M.D.

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
79%Service-mix similarityView profile →

Kenneth Robert Daughters, M.D.

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
79%Service-mix similarityView profile →

Bernard Chow, M.D.

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
78%Service-mix similarityView profile →

Spencer E Price, MD

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
77%Service-mix similarityView profile →

Robert Christian Maciel, M.D.

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
76%Service-mix similarityView profile →

Joseph A. Luna, M.D.

Diagnostic Radiology · Internal Medicine (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
76%Service-mix similarityView profile →

Manu Singh, M.D.

Diagnostic Radiology · Interventional Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
75%Service-mix similarityView profile →

Chad Selph, M.D.

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
74%Service-mix similarityView profile →

John Yoon, M.D.

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
74%Service-mix similarityView profile →

William Albert Deruso, MD

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
73%Service-mix similarityView profile →

Sean Henry Novak, M.D.

Diagnostic Radiology (CMS) · Santa Barbara, CA

Shared published services
3 shared services · view billing descriptions
  • X-ray of chest, 2 views (71046)
  • X-ray of chest, 1 view (71045)
  • X-ray of knee, 3 views (73562)
73%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.