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Compare the published Medicare service mix of Nicholas E Walker, M.D. with clinicians in the same registry specialty: Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology (CMS).

CORALVILLE, IA · 10 milesEdit location
Within 10 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.

Ahmad Zafir Arham, M.D.

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology (CMS) · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
74%Service-mix similarity~3.1 milesView profile →

Linda M Lee, MD

Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • 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)
71%Service-mix similarity~3.1 milesView profile →

Spas V Kotev, MD

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology (CMS) · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
71%Service-mix similarity~4.4 milesView profile →

Mohammed O Ali, MD

Specialty details in registry · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
68%Service-mix similarity~3.1 milesView profile →

James D Rossen, MD

Cardiovascular Disease (Cardiology) · Interventional Cardiology (CMS) · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
68%Service-mix similarity~3.1 milesView profile →

Jason Edward Allen, M.D.

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology (CMS) · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
60%Service-mix similarity~3.1 milesView profile →

Hossein Bozorgmehr Ouranos, M.D.

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology (CMS) · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
59%Service-mix similarity~3.1 milesView profile →

Phillip A Horwitz, MD

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology (CMS) · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
54%Service-mix similarity~3.1 milesView profile →

Vikram Sharma, MD, MRCP, MD(RES)

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology (CMS) · Iowa City, IA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
45%Service-mix similarity~3.1 milesView profile →

John P Mehegan, MD

Cardiovascular Disease (Cardiology) · Internal Medicine · Interventional Cardiology (CMS) · Iowa City, IA

Shared published services
2 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)
33%Service-mix similarity~4.4 milesView profile →

Kartik Mani, MD

Cardiovascular Disease (Cardiology) (CMS) · Iowa City, IA

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)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist (93458)
32%Service-mix similarity~3.7 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.