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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).

CLAREMORE, OK · 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 · 11 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 similarity~24.3 milesView 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 similarity~24.3 milesView profile →

Ankit K Chothani, M.B.;B.S.

Interventional Cardiology (CMS) · Tulsa, OK

Shared published services
3 shared services · view billing descriptions
  • Ultrasound of both sides of head and neck blood flow (93880)
  • Ultrasound study of one arm or leg veins with compression and maneuvers (93971)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
48%Service-mix similarity~24.3 milesView profile →

Lior Shamai, 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)
46%Service-mix similarity~23.0 milesView profile →

Eugene J Ichinose, 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)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
35%Service-mix similarity~22.8 milesView profile →

Gregory D Johnsen, MD

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

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
30%Service-mix similarity~22.8 milesView profile →

Robert Louis Smith, M.D.

Interventional Cardiology (CMS) · Tulsa, OK

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
30%Service-mix similarity~24.3 milesView profile →

James Ray Higgins, M.D.

Specialty details in registry · 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)
  • Nuclear medicine studies of heart muscle at rest and with stress and spect (78452)
  • Ultrasound of both sides of head and neck blood flow (93880)
29%Service-mix similarity~22.0 milesView profile →

Rajesh H Chandwaney, M.D.

Interventional Cardiology (CMS) · Tulsa, OK

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
26%Service-mix similarity~22.8 milesView profile →

Kamran Ijaz Muhammad, MD

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

Shared published services
3 shared services · view billing descriptions
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist (93458)
23%Service-mix similarity~22.8 milesView profile →

Wayne N Leimbach, M.D.

Specialty details in registry · Tulsa, OK

Shared published services
1 shared services · view billing descriptions
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
8%Service-mix similarity~22.8 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.