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Similar work.
More providers to explore.

Compare the published Medicare service mix of Steven Sean Callahan, PH.D. with clinicians in the same registry specialty: Clinical Psychologist (CMS).

HOUSTON, TX · Exact areaEdit location

2024 published service data · 53 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Robyn Ann Reed, PHD

Clinical Psychologist (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Evaluation of psychological test, each additional hour (96131)
  • Psychiatric diagnostic evaluation (90791)
99%Service-mix similarityView profile →

Kevin G Smith, PH.D.

Clinical Psychologist (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Evaluation of psychological test, each additional hour (96131)
  • Psychiatric diagnostic evaluation (90791)
91%Service-mix similarityView profile →

Rahsheda Perine, PHD

Clinical Psychologist (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Evaluation of psychological test, each additional hour (96131)
  • Psychiatric diagnostic evaluation (90791)
54%Service-mix similarityView profile →

Andres Tapia, LPC

Clinical Psychologist (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Psychiatric diagnostic evaluation (90791)
  • Administration of psychological or neuropsychological test, first 30 minutes (96136)
53%Service-mix similarityView profile →

Stuart Joel Nathan, PH.D.

Clinical Psychologist (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Psychiatric diagnostic evaluation (90791)
  • Evaluation of psychological test, first hour (96130)
49%Service-mix similarityView profile →

Samuel A Wolde

Clinical Psychologist (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Psychiatric diagnostic evaluation (90791)
  • Evaluation of psychological test, first hour (96130)
46%Service-mix similarityView profile →

Grace Sung-Tzu Kao, PH.D.

Clinical Psychologist (CMS) · Houston, TX

Shared published services
1 shared services · view billing descriptions
  • Psychiatric diagnostic evaluation (90791)
41%Service-mix similarityView profile →

Yasmine Omar, PHD

Clinical Psychologist (CMS) · Houston, TX

Shared published services
1 shared services · view billing descriptions
  • Psychiatric diagnostic evaluation (90791)
41%Service-mix similarityView profile →

Anthony R Ward, PHD

Clinical Psychologist (CMS) · Houston, TX

Shared published services
1 shared services · view billing descriptions
  • Psychiatric diagnostic evaluation (90791)
41%Service-mix similarityView profile →

Sara Nowakowski, PH.D.

Clinical Psychologist (CMS) · Houston, TX

Shared published services
1 shared services · view billing descriptions
  • Psychiatric diagnostic evaluation (90791)
41%Service-mix similarityView profile →

Callie Dunn, PH.D

Clinical Psychologist (CMS) · Houston, TX

Shared published services
2 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Administration of psychological or neuropsychological test, first 30 minutes (96136)
27%Service-mix similarityView profile →

Sujin Ann-Yi, PH.D

Clinical Psychologist (CMS) · Houston, TX

Shared published services
1 shared services · view billing descriptions
  • Psychiatric diagnostic evaluation (90791)
27%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.