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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (4)

The overall average patient rating of Dr. John Gruendel is Average. Dr. Gruendel has been reviewed by 7 patients who have provided 4 comments. The rating is 2.5 out of 5 stars.

Patient Ratings
Ease of Appointment 2.9
Promptness 3.1
Courteous Staff 3.4
Accurate Diagnosis 3.1
Bedside Manner 2.6
Spends Time with Me 2.0
Follows Up After Visit 2.9

Specialties & Research

Dr. John Gruendel, MD is board certified in Internal Medicine and Cardiovascular Disease.

  • He has special expertise in 4 areas:
  • Acute Coronary Syndrome (ACS)
  • Heart Block
  • High Blood Pressure (Hypertension)
  • Unstable Angina

Education & Awards

Dr. Gruendel graduated from New York Medical College, Valhalla.


Dr. Gruendel has 7 hospital affiliations:

  • Danbury Hospital 
  • Putnam Hospital Center 


  • French
  • Spanish
  • Arabic
  • Chinese

> > > > Dr. John Gruendel, MD

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Additional Information
Dr. John Charles Gruendel MD is a male Internist, has 24 years of experience and practices in Internal Medicine and Cardiovascular Disease.
Where does Dr. John C. Gruendel practice?
Dr. John Gruendel has 3 office locations.
Dr. John Gruendel practices Internal Medicine and Cardiovascular Disease near Carmel, NY.
Additional practice locations include: Mount Kisco, NY.
See Carmel Internists and Carmel Cardiologists.