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

GREENVILLE, SC · Exact areaEdit location

2024 published service data · 38 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Joseph S. Lebel, M.D.

Gastroenterology (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
94%Service-mix similarityView profile →

Ritu Saha, MD

Gastroenterology (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
90%Service-mix similarityView profile →

Paul A Mazanec, M.D.

Gastroenterology (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
89%Service-mix similarityView profile →

David I Gaines, MD

Gastroenterology · Internal Medicine (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
88%Service-mix similarityView profile →

Olga Vitorsky, D.O.

Internal Medicine (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
87%Service-mix similarityView profile →

Jared Thomas Geist, M.D.

Gastroenterology (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
87%Service-mix similarityView profile →

Matthew Ryan Barnes, MD

Gastroenterology (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
87%Service-mix similarityView profile →

David Quentin Gulley, M.D.

Gastroenterology (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
86%Service-mix similarityView profile →

Preston Allen Jones, M.D.

Gastroenterology (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
86%Service-mix similarityView profile →

Ayub A Merchant, M.D.

Gastroenterology (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
86%Service-mix similarityView profile →

Peter Alex Naas, M.D.

Gastroenterology · Internal Medicine (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
86%Service-mix similarityView profile →

Anthony James Horton

Internal Medicine (CMS) · Greenville, SC

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Pathology examination of tissue using a microscope, intermediate complexity (88305)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
84%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.