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Compare the published Medicare service mix of Petros Gene Leinonen, M.D. with clinicians in the same registry specialty: Cardiac Surgery · Thoracic Surgery (CMS).

OAK RIDGE, TN · 25 milesEdit location
Within 25 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 · 13 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Carlo O. Martinez Torres, MD

Cardiac Surgery (CMS) · Knoxville, TN

Shared published services
2 shared services · view billing descriptions
  • Coronary artery bypass using artery graft, 1 graft (33533)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
69%Service-mix similarity~12.3 milesView profile →

William Walter Mcalexander, MD

Thoracic Surgery (CMS) · Knoxville, TN

Shared published services
2 shared services · view billing descriptions
  • Coronary artery bypass using artery graft, 1 graft (33533)
  • Coronary artery bypass using vein or artery graft, 2 grafts (33518)
67%Service-mix similarity~13.1 milesView profile →

Kimberly Linden, MD

Cardiac Surgery (CMS) · Knoxville, TN

Shared published services
2 shared services · view billing descriptions
  • Coronary artery bypass using artery graft, 1 graft (33533)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
43%Service-mix similarity~20.0 milesView profile →

John M Hance, MD, MPH

Thoracic Surgery (CMS) · Knoxville, TN

Shared published services
2 shared services · view billing descriptions
  • Coronary artery bypass using artery graft, 1 graft (33533)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
42%Service-mix similarity~12.3 milesView profile →

John Murray, M.D.

Cardiac Surgery (CMS) · Knoxville, TN

Shared published services
2 shared services · view billing descriptions
  • Coronary artery bypass using artery graft, 1 graft (33533)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
42%Service-mix similarity~20.0 milesView profile →

Norbert E. Baumgartner, MD

Cardiovascular Disease (Cardiology) · Thoracic Surgery (CMS) · Knoxville, TN

Shared published services
2 shared services · view billing descriptions
  • Coronary artery bypass using artery graft, 1 graft (33533)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
41%Service-mix similarity~12.3 milesView profile →

William A Walker, MD

General Surgery (CMS) · Knoxville, TN

Shared published services
1 shared services · view billing descriptions
  • Coronary artery bypass using artery graft, 1 graft (33533)
34%Service-mix similarity~13.1 milesView profile →

Thomas Sloane Guy, MD

Thoracic Surgery (CMS) · Knoxville, TN

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
21%Service-mix similarity~12.3 milesView profile →

Raymond A Dieter, MD

Cardiac Surgery · Thoracic Surgery (CMS) · Knoxville, TN

Shared published services
1 shared services · view billing descriptions
  • Coronary artery bypass using artery graft, 1 graft (33533)
20%Service-mix similarity~20.0 milesView profile →

David Bennet Graham, MD

Thoracic Surgery (CMS) · Knoxville, TN

Shared published services
1 shared services · view billing descriptions
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
20%Service-mix similarity~12.3 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.