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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).

Learn more about Dr. John Mannion:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. John Mannion is Good. Dr. Mannion has been reviewed by 3 patients who have provided 0 comments. The rating is 4 out of 5 stars.

Patient Ratings
Ease of Appointment 4.6
Promptness 4.1
Courteous Staff 4.1
Accurate Diagnosis 3.7
Bedside Manner 3.7
Spends Time with Me 5.0
Follows Up After Visit 4.1

Specialties & Research

Dr. John Mannion, MD is board certified in Thoracic Surgery (Cardiothoracic Vascular Surgery).

  • He has special expertise in 6 areas:
  • Cardiac Surgical Procedures
  • Cardiomyoplasty
  • Cardiopulmonary Bypass (CPB)
  • Coronary Artery Bypass (Heart Bypass)
  • Coronary Disease
  • Heart Disease (Myocardial Ischemia)

Education & Awards

Dr. Mannion graduated from Cornell University, New York.


Dr. Mannion has 5 hospital affiliations:

  • Kent General Hospital-Bayhealth Med Center 
  • Bayhealth Kent General 


  • English

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Additional Information
Dr. John D Mannion MD is a male Cardiothoracic Surgeon, has 33 years of experience and practices in Thoracic Surgery and Cardiothoracic Vascular Surgery.
Where does Dr. John D. Mannion practice?
Dr. John Mannion has 1 office location.
Dr. John Mannion practices Thoracic Surgery and Cardiothoracic Vascular Surgery near Dover, DE.
See Dover Surgeons.