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Similar work.
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Compare the published Medicare service mix of Steven N Zudiker, PSY.D. with clinicians in the same registry specialty: Specialty details in registry.

CA · Exact areaEdit location

2024 published service data · 500 eligible profiles compared. This search reached its 500-profile comparison limit, using NPI order. Narrow the location for a more focused comparison. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Dominic Lafler, PSY.D.

Specialty details in registry · San Diego, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
98%Service-mix similarityView profile →

Christopher Michael Barmann, PH.D.

Specialty details in registry · San Diego, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
93%Service-mix similarityView profile →

Mark Lukasik

Specialty details in registry · San Diego, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychiatric diagnostic evaluation (90791)
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
91%Service-mix similarityView profile →

Margitsa Valaskantjis, PH.D.

Clinical Psychologist (CMS) · El Cajon, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
90%Service-mix similarityView profile →

Katherine Rodriguez, PSY.D.

Clinical Psychologist (CMS) · El Cajon, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
90%Service-mix similarityView profile →

Araseli P Lewis, PH.D

Clinical Psychologist (CMS) · San Diego, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
89%Service-mix similarityView profile →

Radhika Katyal-Castillo, PSY.D.

Specialty details in registry · Chula Vista, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
89%Service-mix similarityView profile →

Scott Randall Bass, PSY.D.

Clinical Psychologist (CMS) · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
87%Service-mix similarityView profile →

Robert A. Chernoff, PH.D

Clinical Psychologist (CMS) · Culver City, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
85%Service-mix similarityView profile →

Rachel Bader

Clinical Psychologist (CMS) · San Diego, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
85%Service-mix similarityView profile →

Jared Kliger, PSY.D.

Clinical Psychologist (CMS) · Pasadena, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
83%Service-mix similarityView profile →

Amanda Ting, PH.D.

Clinical Psychologist (CMS) · Los Angeles, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
83%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.