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Compare the published Medicare service mix of Mark Wayne Williams, MD, PHD with clinicians in the same registry specialty: Surgery.

IA · Exact areaEdit location

2024 published service data · 163 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Luke Allen Byerly, M.D.

Surgery · Waterloo, IA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
67%Service-mix similarityView profile →

Heather Anna Osterbrink, M.D.

Surgery · Creston, IA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
62%Service-mix similarityView profile →

Paul C Pierson, DO

Surgery · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
60%Service-mix similarityView profile →

Elleson Ann Schurtz, MD

Surgery · Decorah, IA

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)
60%Service-mix similarityView profile →

Timothy Allen Breon, M.D.

Surgery · Oskaloosa, IA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
56%Service-mix similarityView profile →

Jose Andres Moreno Lopez, MD

Surgery · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
56%Service-mix similarityView profile →

Meghan Wooster, D.O.

Surgery · West Burlington, IA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
55%Service-mix similarityView profile →

Brooke Autumn Konz, MD

Surgery · Le Mars, IA

Shared published services
3 shared services · view billing descriptions
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
  • 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 →

Paul Arthur Riggs, M.D.

Surgery · Oskaloosa, IA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
55%Service-mix similarityView profile →

Luke C Brunner, MD

Surgery · Cedar Rapids, IA

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)
  • Biopsy of large bowel using a flexible endoscope (45380)
54%Service-mix similarityView profile →

Bruce Alan Obbink, M.D.

Surgery · Dubuque, IA

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
  • Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)
53%Service-mix similarityView profile →

Kevin Huang

Surgery · Iowa City, IA

Shared published services
2 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
53%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.