Placeholder Photo for Sei Iwai, MD

Dr. Sei Iwai is a cardiac electrophysiologist in Valhalla who specializes in treating rhythm disorders of the heart, such as heart murmurs and palpitations.


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Westchester Medical Center Advanced Physician Serv  


100 Woods Road, Valhalla, NY 10595

Office Details

Doctor Specialty Cardiac Electrophysiology
Practice Specialty Multi Specialty
Languages Spoken English

Westchester Medical Center Advanced Physician Services, PC  


(914) 594-4434


95 Grasslands Road, Valhalla, NY 10595-1652

Office Details

Doctor Specialty Cardiac Electrophysiology
Languages Spoken English

Insurance Accepted  

  • Medicare

About Dr. Iwai
Dr. Iwai



Dr. Sei Iwai graduated from Columbia University College of Physicians and Surgeons in 1994.

Dr. Iwai has two offices in New York where he specializes in Cardiac Electrophysiology.

Dr. Iwai works with one hundred and ninety doctors including Dr. Chhaya Aggarwal and Dr. Ryalynn Carter.


Education & Training  

Hospital Affiliations

  • Westchester County Health Care Corporation

Languages Spoken  

  • English

Dr. Iwai's Medicare Fee‑for‑Service Data (2014)  

Please Note: The information displayed below is sourced from the 2014 Medicare Physician and Other Supplier National Provider Identifier (NPI) Aggregate Report. It's important to remember that the statistics below are not inclusive of all patients treated by Dr. Iwai, but only those who participate in Medicare.

  • Participates in Medicare?: Yes 
  • Number of HCPCS Codes: 64 
  • Number of Services: 528 
  • Medical Suppress Indicator:  
  • Number of HCPCS Associated With Medical Services: 64 
  • Number of Medical Services: 528 
  • Number of Medicare Patients with Medical Services: 191 
  Medicare Patient Demographics
  • Total Number of Medicare Patients: 191 
  • Average Age of Medicare Patients: 74 
  • Number of Patients Under Age 65: 23 
  • Number of Patients Age 65 to 74: 73 
  • Number of Patients Age 75 to 84: 64 
  • Number of Patients Over Age 84: 31 
  • Number of Female Patients : 59 
  • Number of Male Patients: 132 
  • Number of Non-Hispanic White Patients: 151 
  • Number of Black or African American Patients: 20 
  • Number of Asian Pacific Islander Patients: 0 
  • Number of Hispanic Patients: 0 
  • Number of American Indian/Alaska Native Patients: 0 
  • Number of Patients with Race Not Elsewhere Classified: 0 
  • Number of Patients with Medicare Only Entitlement: 161 
  • Number of Patients with Medicare & Medicaid Entitlement: 30 
  Medicare Patient Condition Demographics
  • Percent of Patients with Atrial Fibrillation: 56% 
  • Percent of Patients with Alzheimer’s Disease or Dementia: 18% 
  • Percent of Patients with Asthma: 9% 
  • Percent of Patients with Cancer: 10% 
  • Percent of Patients with Heart Failure: 60% 
  • Percent of Patients with Chronic Kidney Disease: 43% 
  • Percent of Patients with Chronic Obstructive Pulmonary Disease: 23% 
  • Percent of Patients with Depression: 23% 
  • Percent of Patients with Diabetes: 50% 
  • Percent of Patients with Hyperlipidemia: 75% 
  • Percent of Patients with Hypertension (High Blood Pressure): 75% 
  • Percent of Patients with Ischemic Heart Disease: 72% 
  • Percent of Patients with Osteoporosis: 6% 
  • Percent of Patients with Rheumatoid Arthritis / Osteoarthritis: 30% 
  • Percent of Patients with Schizophrenia / Other Psychotic Disorders: 0% 
  • Percent of Patients with Stroke: 16% 
  Medicare Payments Data
  • Total Submitted Charge Amount: $440,775.04 
  • Total Medicare Allowed Amount: $134,467.01 
  • Total Medicare Payment Amount: $104,655.70 
  • Total Medicare Standardized Payment Amount: $89,699.87 
  • Total Medical Submitted Charge Amount: $440,775.04 
  • Total Medical Medicare Allowed Amount: $134,467.01 
  • Total Medical Medicare Payment Amount: $104,655.70 
  • Total Medical Medicare Standardized Payment Amount: $89,699.87 
  Medicare Prescription Drug Data
  • Drug Suppress Indicator: n/a 
  • Number of HCPCS Associated With Drug Services: 0 
  • Number of Drug Services: 0 
  • Number of Medicare Beneficiaries With Drug Services: 0 
  • Total Drug Submitted Charge Amount: $0.00 
  • Total Drug Medicare Allowed Amount: $0.00 
  • Total Drug Medicare Payment Amount: $0.00 
  • Total Drug Medicare Standardized Payment Amount: $0.00