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Similar work.
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Compare the published Medicare service mix of Zachary Wade Marshall, M.D. with clinicians in the same registry specialty: Allergy/Immunology · Internal Medicine (CMS).

TX · Exact areaEdit location

2024 published service data · 44 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Steven Larry Cole, D.O.

Allergy/Immunology (CMS) · Dallas, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Test for allergy using allergenic extract injected into skin (95024)
83%Service-mix similarityView profile →

Dennis Dilley, M.D.

Allergy/Immunology · Pediatric Medicine (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Test for allergy using allergenic extract injected into skin (95024)
81%Service-mix similarityView profile →

Rene Albert Leon, M.D.

Allergy/Immunology · Internal Medicine (CMS) · Southlake, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Test for allergy using allergenic extract injected into skin (95024)
79%Service-mix similarityView profile →

Tommy Chua Sim, M.D.

Specialty details in registry · Friendswood, TX

Shared published services
3 shared services · view billing descriptions
  • Professional service for preparation and provision of single-dose vial of allergen (95144)
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
79%Service-mix similarityView profile →

Christina Huddleston, M.D.

Allergy/Immunology (CMS) · Dallas, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Test for allergy using allergenic extract injected into skin (95024)
79%Service-mix similarityView profile →

Swapnil Vaidya, MD, PHD

Allergy/Immunology · Internal Medicine (CMS) · Fort Worth, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Test for allergy using allergenic extract injected into skin (95024)
77%Service-mix similarityView profile →

Sunil Kumar Saraf, M.D.

Allergy/Immunology (CMS) · Pasadena, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Test for allergy using allergenic extract injected into skin (95024)
76%Service-mix similarityView profile →

Brian Terry Miller, D.O.

Allergy/Immunology (CMS) · Georgetown, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Test for allergy using allergenic extract injected into skin (95024)
76%Service-mix similarityView profile →

Carlos James Vital, M.D.

Allergy/Immunology (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Test for allergy using allergenic extract injected into skin (95024)
76%Service-mix similarityView profile →

William F. Long, MD

Allergy/Immunology (CMS) · Temple, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Professional service for multiple injections of allergen (95117)
75%Service-mix similarityView profile →

Alnoor Malick

Allergy/Immunology · Internal Medicine (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Test for allergy using allergenic extract injected into skin (95024)
74%Service-mix similarityView profile →

Amanda Lewis, M.D.

Allergy/Immunology (CMS) · Lubbock, TX

Shared published services
3 shared services · view billing descriptions
  • Test for allergy using allergenic extract (95004)
  • Professional service for preparation and provision of 1 or more antigens (95165)
  • Professional service for multiple injections of allergen (95117)
73%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.