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Compare the published Medicare service mix of Cynthia Marie Walljasper Mcwilliams, PHD with clinicians in the same registry specialty: Clinical Psychologist (CMS).

IA · Exact areaEdit location

2024 published service data · 27 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Marie E. Volbrecht, PH.D.

Clinical Psychologist (CMS) · Cedar Rapids, IA

Shared published services
3 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Evaluation of neuropsychological test, each additional hour (96133)
  • Exam of neurobehavioral status, first hour (96116)
99%Service-mix similarityView profile →

Evan Robert Buikema, PSY.D.

Clinical Psychologist (CMS) · Ames, IA

Shared published services
3 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Evaluation of neuropsychological test, each additional hour (96133)
  • Administration of psychological or neuropsychological test, first 30 minutes (96136)
84%Service-mix similarityView profile →

Ronald J Ridder, PHD

Specialty details in registry · Cedar Rapids, IA

Shared published services
3 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Exam of neurobehavioral status, first hour (96116)
  • Administration of psychological or neuropsychological test, first 30 minutes (96136)
81%Service-mix similarityView profile →

Aaron Baker, PHD

Clinical Psychologist (CMS) · Sioux City, IA

Shared published services
3 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, each additional 30 minutes (96137)
  • Evaluation of neuropsychological test, each additional hour (96133)
  • Exam of neurobehavioral status, first hour (96116)
79%Service-mix similarityView profile →

Natalie L Denburg, PHD

Clinical Psychologist (CMS) · Iowa City, IA

Shared published services
2 shared services · view billing descriptions
  • Evaluation of neuropsychological test, each additional hour (96133)
  • Evaluation of neuropsychological test, first hour (96132)
63%Service-mix similarityView profile →

Kevin Kilcawley, PSY.D.

Clinical Psychologist (CMS) · West Des Moines, IA

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)
49%Service-mix similarityView profile →

Jessica Brooke Virzi, PSY.D.

Clinical Psychologist (CMS) · Ames, IA

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)
48%Service-mix similarityView profile →

Jamie A Ryder, PHD

Clinical Psychologist (CMS) · Council Bluffs, IA

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)
37%Service-mix similarityView profile →

Beth Laura Dinoff, PHD

Specialty details in registry · Iowa City, IA

Shared published services
1 shared services · view billing descriptions
  • Administration of psychological or neuropsychological test, first 30 minutes (96136)
17%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.