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Compare the published Medicare service mix of Christopher C Allen, MD with clinicians in the same registry specialty: Internal Medicine · Interventional Cardiology (CMS).

OK · Exact areaEdit location

2024 published service data · 100 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Stanley Kyle Zimmerman, MD

Interventional Cardiology (CMS) · Tulsa, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Ultrasound of both sides of head and neck blood flow (93880)
  • Ultrasound study of one arm or leg veins with compression and maneuvers (93971)
66%Service-mix similarityView profile →

Bryan Allen Lucenta, MD

Interventional Cardiology (CMS) · Muskogee, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)
  • Nuclear medicine studies of heart muscle at rest and with stress and spect (78452)
64%Service-mix similarityView profile →

Michael Gene Spain, M.D.

Cardiovascular Disease (Cardiology) · Interventional Cardiology (CMS) · Muskogee, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Ultrasound of both sides of head and neck blood flow (93880)
  • Ultrasound study of one arm or leg veins with compression and maneuvers (93971)
64%Service-mix similarityView profile →

John Kesler Evans, D.O.

Internal Medicine · Interventional Cardiology (CMS) · Tulsa, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)
  • Nuclear medicine studies of heart muscle at rest and with stress and spect (78452)
63%Service-mix similarityView profile →

Troy R Norred, MD

Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Ada, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)
  • Nuclear medicine studies of heart muscle at rest and with stress and spect (78452)
62%Service-mix similarityView profile →

Soni J Zacharias, MD

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology · Nuclear Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)
  • Nuclear medicine studies of heart muscle at rest and with stress and spect (78452)
62%Service-mix similarityView profile →

Stephen Dixon, D.O.

Cardiovascular Disease (Cardiology) · Interventional Cardiology (CMS) · Tulsa, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)
  • Nuclear medicine studies of heart muscle at rest and with stress and spect (78452)
62%Service-mix similarityView profile →

John G Ivanoff, M.D.

Interventional Cardiology (CMS) · Tulsa, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)
  • Nuclear medicine studies of heart muscle at rest and with stress and spect (78452)
62%Service-mix similarityView profile →

Agha Khan, M.D.

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology · Nuclear Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)
  • Nuclear medicine studies of heart muscle at rest and with stress and spect (78452)
62%Service-mix similarityView profile →

Brenda Kris Mullins, MD

Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)
  • Nuclear medicine studies of heart muscle at rest and with stress and spect (78452)
60%Service-mix similarityView profile →

James B Chapman, M.D.

Interventional Cardiology (CMS) · Grove, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)
  • Ultrasound of both sides of head and neck blood flow (93880)
57%Service-mix similarityView profile →

Thomas A Hennebry, MD

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology · Nuclear Medicine (CMS) · Oklahoma City, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)
  • Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician (93018)
  • Ultrasound of both sides of head and neck blood flow (93880)
56%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.