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Compare the published Medicare service mix of Derek Edwin Williams, MD with clinicians in the same registry specialty: Thoracic Surgery (CMS).

TX · Exact areaEdit location

2024 published service data · 252 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

David William Daniel, M.D.

Thoracic Surgery (CMS) · Temple, TX

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Harvest of vein using an endoscope (33508)
  • Exclusion of appendage of left upper chamber of heart performed during other procedure on chest (33268)
70%Service-mix similarityView profile →

Tyler Cooley Spata, MD

General Surgery · Thoracic Surgery (CMS) · Bryan, TX

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Exclusion of appendage of left upper chamber of heart performed during other procedure on chest (33268)
66%Service-mix similarityView profile →

Michael Koeckert, M.D.

Critical Care (Intensivists) · General Surgery · Thoracic Surgery · Vascular Surgery (CMS) · The Woodlands, TX

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Harvest of vein using an endoscope (33508)
  • Exclusion of appendage of left upper chamber of heart performed during other procedure on chest (33268)
64%Service-mix similarityView profile →

Vivekkumar Patel, M.D.

Cardiac Surgery · Thoracic Surgery (CMS) · The Woodlands, TX

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Harvest of vein using an endoscope (33508)
  • Exclusion of appendage of left upper chamber of heart performed during other procedure on chest (33268)
64%Service-mix similarityView profile →

Marc R Moon, MD

Cardiac Surgery · Thoracic Surgery (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Harvest of vein using an endoscope (33508)
  • Coronary artery bypass using artery graft, 1 graft (33533)
62%Service-mix similarityView profile →

Harry Kourlis, MD

Thoracic Surgery (CMS) · Texarkana, TX

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Harvest of vein using an endoscope (33508)
  • Coronary artery bypass using artery graft, 1 graft (33533)
61%Service-mix similarityView profile →

William Michael Davis, M.D.

Thoracic Surgery (CMS) · San Antonio, TX

Shared published services
3 shared services · view billing descriptions
  • Harvest of vein using an endoscope (33508)
  • Exclusion of appendage of left upper chamber of heart performed during other procedure on chest (33268)
  • Coronary artery bypass using artery graft, 1 graft (33533)
61%Service-mix similarityView profile →

Benjamin Hirsch, M.D.

Thoracic Surgery (CMS) · Lubbock, TX

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
60%Service-mix similarityView profile →

Walter W Ohara, MD

Thoracic Surgery (CMS) · Houston, TX

Shared published services
3 shared services · view billing descriptions
  • Harvest of vein using an endoscope (33508)
  • Exclusion of appendage of left upper chamber of heart performed during other procedure on chest (33268)
  • Coronary artery bypass using artery graft, 1 graft (33533)
59%Service-mix similarityView profile →

Scott Harrison Crocker, M.D.

Cardiac Surgery · Thoracic Surgery (CMS) · Abilene, TX

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
58%Service-mix similarityView profile →

Michail Magarakis, M.D.

Thoracic Surgery (CMS) · Corpus Christi, TX

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Coronary artery bypass using artery graft, 1 graft (33533)
57%Service-mix similarityView profile →

Victor Sardinha Reis, M.D.

Thoracic Surgery (CMS) · Edinburg, TX

Shared published services
3 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
57%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.