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Compare the published Medicare service mix of Roger Anthony Shammas, M.D. with clinicians in the same registry specialty: Cardiovascular Disease.

GRAND RAPIDS, MI · Exact areaEdit location

2024 published service data · 27 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Gregory Lance Miller, M.D.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
89%Service-mix similarityView profile →

George John Ghuneim, D.O.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
81%Service-mix similarityView profile →

Dustin Taylor Harmon, D.O.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
80%Service-mix similarityView profile →

Abdel Rahman Abuobieda Omer, M.D.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
79%Service-mix similarityView profile →

Ali Mahajerin, M.D.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
75%Service-mix similarityView profile →

David Arthur Mcnamara, M.D., M.P.H.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
72%Service-mix similarityView profile →

Michael Clifton Vredenburg, D.O.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
72%Service-mix similarityView profile →

Mohamad Ali Kenaan, M.D.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
71%Service-mix similarityView profile →

Thomas F Boyden, MD

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
71%Service-mix similarityView profile →

Kara Denby, M.D.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
71%Service-mix similarityView profile →

Vincent Andrew Pallazola, M.D.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
69%Service-mix similarityView profile →

Jeffrey Mark Decker, M.D.

Cardiovascular Disease · Grand Rapids, MI

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
69%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.