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Similar work.
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Compare the published Medicare service mix of Dan C Purtzer, MD with clinicians in the same registry specialty: Specialty details in registry.

CA · Exact areaEdit location

2024 published service data · 159 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Azra Ozzie Zarrinpar, M.D.

Pathology (CMS) · Los Angeles, CA

Shared published services
2 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to identify organisms including interpretation and report (88312)
90%Service-mix similarityView profile →

Carlene A Hawksley, MD

Specialty details in registry · Santa Cruz, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to identify organisms including interpretation and report (88312)
  • Pathology examination of tissue using a microscope, moderately low complexity (88304)
84%Service-mix similarityView profile →

Brad S Adler, M.D.

Specialty details in registry · Ventura, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to identify organisms including interpretation and report (88312)
  • Pathology examination of tissue using a microscope, moderately low complexity (88304)
83%Service-mix similarityView profile →

David P Frishberg, M.D.

Pathology (CMS) · West Hollywood, CA

Shared published services
3 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Special stained specimen slides to identify organisms including interpretation and report (88312)
  • Pathology examination of tissue using a microscope, moderately low complexity (88304)
82%Service-mix similarityView profile →

Alexander Nobori

Pathology (CMS) · Los Angeles, CA

Shared published services
1 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
81%Service-mix similarityView profile →

Gabor Hertz, MD

Pathology (CMS) · Sacramento, CA

Shared published services
1 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
81%Service-mix similarityView profile →

John W. Walsh, MD

Specialty details in registry · Walnut Creek, CA

Shared published services
1 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
81%Service-mix similarityView profile →

Jinping Lai

Pathology (CMS) · West Hollywood, CA

Shared published services
1 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
81%Service-mix similarityView profile →

Erica Fan Clayton, M.D.

Pathology (CMS) · Greenbrae, CA

Shared published services
1 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
81%Service-mix similarityView profile →

Charles A Amezcua, M.D.

Pathology (CMS) · Santa Rosa, CA

Shared published services
1 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
81%Service-mix similarityView profile →

Qi-Lin D. Cheng, MD

Pathology (CMS) · Walnut Creek, CA

Shared published services
1 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
81%Service-mix similarityView profile →

Dandan Wang, MD

Pathology (CMS) · Los Angeles, CA

Shared published services
1 shared services · view billing descriptions
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
81%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.