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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.

SANTEE, CA · 10 milesEdit location
Within 10 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 · 33 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Cassandra Mary Kauffman, PSYD

Clinical Psychologist (CMS) · Lakeside, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
94%Service-mix similarity~3.6 milesView 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 similarity~3.6 milesView 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 similarity~3.8 milesView profile →

Sarah Poselli Beyer, PH.D.

Specialty details in registry · San Diego, 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)
82%Service-mix similarity~10.0 milesView profile →

Jennifer Mary Hauser, M.A.

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)
81%Service-mix similarity~9.7 milesView profile →

Pooja Amatya

Specialty details in registry · San Diego, 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)
77%Service-mix similarity~10.0 milesView profile →

David E. Duffy, PHD

Clinical Psychologist (CMS) · La Mesa, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
71%Service-mix similarity~4.7 milesView profile →

Ilan Jeffrey Zuk, PHD

Clinical Psychologist (CMS) · Spring Valley, CA

Shared published services
3 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
70%Service-mix similarity~8.3 milesView profile →

Callan Elizabeth Powers-Magro, PSY.D.

Clinical Psychologist (CMS) · San Diego, CA

Shared published services
3 shared services · view billing descriptions
  • Psychiatric diagnostic evaluation (90791)
  • Evaluation of psychological test, each additional hour (96131)
  • Evaluation of psychological test, first hour (96130)
62%Service-mix similarity~6.2 milesView profile →

Michelle Koren Boswell, PH.D., HSPP

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)
53%Service-mix similarity~9.8 milesView profile →

Hugh D. Pates, PHD

Clinical Psychologist (CMS) · La Mesa, CA

Shared published services
2 shared services · view billing descriptions
  • Psychotherapy, 30 minutes (90832)
  • Psychiatric diagnostic evaluation (90791)
53%Service-mix similarity~4.7 milesView profile →

Janice M Green, PH.D.

Clinical Psychologist (CMS) · San Diego, CA

Shared published services
2 shared services · view billing descriptions
  • Psychotherapy, 45 minutes (90834)
  • Psychiatric diagnostic evaluation (90791)
46%Service-mix similarity~9.8 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.