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Compare the published Medicare service mix of James Lawrence Zellner, MD with clinicians in the same registry specialty: Cardiac Surgery · Cardiovascular Disease (Cardiology) · Thoracic Surgery (CMS).

CHATTANOOGA, TN · Exact areaEdit location

2024 published service data · 10 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

John Michael Craig, MD

Cardiac Surgery · Thoracic Surgery · Vascular Surgery (CMS) · Chattanooga, TN

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)
  • Harvest of vein using an endoscope (33508)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
80%Service-mix similarityView profile →

Brett Alex Melnikoff, MD

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

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)
  • Harvest of vein using an endoscope (33508)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
70%Service-mix similarityView profile →

Matthew Richey, M.D.

Thoracic Surgery (CMS) · Chattanooga, TN

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)
  • Harvest of vein using an endoscope (33508)
  • Replacement of aortic valve through the skin and femoral artery (33361)
53%Service-mix similarityView profile →

Alan A Simeone, MD

Cardiac Surgery · Cardiovascular Disease (Cardiology) · Thoracic Surgery (CMS) · Chattanooga, TN

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Replacement of aortic valve through the skin and femoral artery (33361)
52%Service-mix similarityView profile →

Wilson Monroe Clements, M.D.

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

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)
  • Harvest of vein using an endoscope (33508)
  • Coronary artery bypass using artery graft, 1 graft (33533)
51%Service-mix similarityView profile →

Stephen Lee Martin, MD

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

Shared published services
3 shared services · view billing descriptions
  • Harvest of vein using an endoscope (33508)
  • Replacement of aortic valve through the skin and femoral artery (33361)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
47%Service-mix similarityView profile →

Larry L Shears, MD

Thoracic Surgery (CMS) · Chattanooga, TN

Shared published services
3 shared services · view billing descriptions
  • Harvest of vein using an endoscope (33508)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Coronary artery bypass using artery graft, 1 graft (33533)
44%Service-mix similarityView profile →

Jeffrey Aaron Poynter, M.D.

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

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)
  • Replacement of aortic valve through the skin and femoral artery (33361)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
37%Service-mix similarityView profile →

Vanessa Marie Miller, M.D.

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

Shared published services
1 shared services · view billing descriptions
  • Harvest of vein using an endoscope (33508)
31%Service-mix similarityView profile →

James Robert Headrick, MD

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

Shared published services
3 shared services · view billing descriptions
  • New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)
  • 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 high level of medical decision making, if using time, 40 minutes or more (99215)
23%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.