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

MUSCATINE, IA · 50 milesEdit location
Within 50 miles · Approximate ZIP-area distance

Approximate straight-line distances between ZIP-area centers; a city search starts from the average of its ZIP centers. Uses the primary reported practice ZIP, not an exact office address or driving distance. Records without matched coordinates are excluded. How distance works

2024 published service data · 63 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

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 similarity~29.0 milesView profile →

Samuel Iran Vazquez, MD

Surgery · Galesburg, IL

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)
57%Service-mix similarity~48.4 milesView 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 similarity~29.0 milesView 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 similarity~41.9 milesView 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 similarity~48.4 milesView 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 similarity~30.3 milesView profile →

Kent C Choi, MD

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 similarity~30.3 milesView profile →

Calvin E Atwell, M.D.

Surgery · Moline, IL

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)
52%Service-mix similarity~28.9 milesView profile →

Luis Jose Garcia, M.D.

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)
52%Service-mix similarity~30.3 milesView profile →

Alexander Neal Kurjatko, M.D.

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)
52%Service-mix similarity~30.3 milesView profile →

Cara Elizabeth Sawyer, 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)
52%Service-mix similarity~41.9 milesView profile →

Allyson Winter, DO

Surgery · Davenport, 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)
51%Service-mix similarity~26.4 milesView 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 approximate distance 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.