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Compare the published Medicare service mix of Gary R Griglione, MD with clinicians in the same registry specialty: Gastroenterology · Internal Medicine (CMS).

MADISON, WI · Exact areaEdit location

2024 published service data · 39 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Jason R. Stangl, MD

Gastroenterology (CMS) · Madison, WI

Shared published services
3 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Colorectal cancer screening; colonoscopy on individual at high risk (G0105)
68%Service-mix similarityView profile →

Rodrigo A Castillo, MD

Gastroenterology (CMS) · Madison, WI

Shared published services
3 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Colorectal cancer screening; colonoscopy on individual at high risk (G0105)
64%Service-mix similarityView profile →

Lisa Lynn Strate, M.D. MPH

Gastroenterology (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
62%Service-mix similarityView profile →

Matthew Winston Caldis, M.D., M.S.

Gastroenterology (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
58%Service-mix similarityView profile →

John Byron Williams, M.D.

Gastroenterology (CMS) · Madison, WI

Shared published services
3 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Colorectal cancer screening; colonoscopy on individual at high risk (G0105)
58%Service-mix similarityView profile →

Siobhan M. Byrne, M.D.

Gastroenterology (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
56%Service-mix similarityView profile →

Megan Lutz

Internal Medicine (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
56%Service-mix similarityView profile →

Christopher Lindholm, MD

Gastroenterology (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
55%Service-mix similarityView profile →

Ian Grimes, M.D.

Gastroenterology · Internal Medicine (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
55%Service-mix similarityView profile →

Antonio Bosch, MD

Gastroenterology (CMS) · Madison, WI

Shared published services
3 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
  • Colorectal cancer screening; colonoscopy on individual at high risk (G0105)
54%Service-mix similarityView profile →

Sumona Saha, M.D.

Gastroenterology (CMS) · Madison, WI

Shared published services
2 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
53%Service-mix similarityView profile →

Vinay L Patel, M.D.

Gastroenterology (CMS) · Madison, WI

Shared published services
1 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
52%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.