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Compare the published Medicare service mix of John Marshall Ketner, D.O. with clinicians in the same registry specialty: Surgery.

MI · Exact areaEdit location

2024 published service data · 500 eligible profiles compared. This search reached its 500-profile comparison limit, using NPI order. Narrow the location for a more focused comparison. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Garrick R. Cvitkovich, MD

Surgery · Grayling, MI

Shared published services
3 shared services · view billing descriptions
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
82%Service-mix similarityView profile →

Jeremy James Kuiper, M.D.

Surgery · Fremont, MI

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
74%Service-mix similarityView profile →

Catherine A Burtrum, DO

Surgery · Marshall, MI

Shared published services
3 shared services · view billing descriptions
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
69%Service-mix similarityView profile →

Stephanie Lemaster, MD

Surgery · Alpena, MI

Shared published services
3 shared services · view billing descriptions
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
67%Service-mix similarityView profile →

Timothy Sears, MD

Surgery · Hancock, MI

Shared published services
3 shared services · view billing descriptions
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
66%Service-mix similarityView profile →

Amy B Jentz, M.D.

Surgery · Ionia, MI

Shared published services
2 shared services · view billing descriptions
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • Biopsy of large bowel using a flexible endoscope (45380)
65%Service-mix similarityView profile →

Darren Leslie Croo, M.D.

Surgery · Williamsburg, MI

Shared published services
3 shared services · view billing descriptions
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
64%Service-mix similarityView profile →

Jennifer Smith Mcleod, M.D.

Surgery · Midland, MI

Shared published services
3 shared services · view billing descriptions
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Biopsy of large bowel using a flexible endoscope (45380)
63%Service-mix similarityView profile →

James Richard Shurlow, D.O.

Surgery · Grayling, MI

Shared published services
3 shared services · view billing descriptions
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
63%Service-mix similarityView profile →

Craig A Duncan, D.O.

Surgery · Cheboygan, MI

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
63%Service-mix similarityView profile →

Abraham L Campbell, DO

Surgery · Escanaba, MI

Shared published services
3 shared services · view billing descriptions
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
63%Service-mix similarityView profile →

Kellyann Vandendool, MD

Surgery · Ludington, MI

Shared published services
3 shared services · view billing descriptions
  • Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
61%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.