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Compare the published Medicare service mix of Roy Mattathu John, MD with clinicians in the same registry specialty: Cardiac Electrophysiology · Cardiovascular Disease (Cardiology) (CMS).

STANFORD, CA · Exact areaEdit location

2024 published service data · 12 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Nitish Badhwar, MD

Cardiac Electrophysiology · Cardiovascular Disease (Cardiology) (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
77%Service-mix similarityView profile →

Albert Joseph Rogers, MD

Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
77%Service-mix similarityView profile →

Alexander Carroll Perino, MD

Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
76%Service-mix similarityView profile →

Mohan Nallicheri Viswanathan, M.D.

Cardiac Electrophysiology (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
75%Service-mix similarityView profile →

Tina Baykaner, MD

Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
64%Service-mix similarityView profile →

Sanjiv Narayan, MD

Cardiac Electrophysiology · Cardiovascular Disease (Cardiology) (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
63%Service-mix similarityView profile →

Girish Ananth Narayan, MD

Cardiac Electrophysiology · Cardiovascular Disease (Cardiology) (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
53%Service-mix similarityView profile →

Marco Valentin Perez, MD

Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
52%Service-mix similarityView profile →

Paul Johnson Wang, MD

Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
  • New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)
  • Comprehensive electrophysiologic evaluation with catheter destruction of abnormality causing atrial fibrillation (uncoordinated contraction of upper chambers of heart) by pulmonary vein isolation (93656)
52%Service-mix similarityView profile →

Sung Hwan Chun, MD

Cardiac Electrophysiology · Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
51%Service-mix similarityView profile →

Rajan Lalit Shah, M.D.

Cardiac Electrophysiology · Cardiovascular Disease (Cardiology) · Internal Medicine (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
  • New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)
46%Service-mix similarityView profile →

John Christopher Evans, MD

Cardiac Electrophysiology · Cardiovascular Disease (Cardiology) (CMS) · Stanford, CA

Shared published services
3 shared services · view billing descriptions
  • Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)
  • Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)
  • Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)
37%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.