Browse Health
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 (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

Similar doctors nearby

Dr. Paul Fedalen

17 years experience
Dover, DE

Dr. Daniel Marelli

Thoracic Surgery (Cardiothoracic Vascular Surgery)
25 years experience
Dover, DE

Dr. Anastasios Polimenakos

16 years experience
Dover, DE

Dr. John Glenn

Thoracic Surgery (Cardiothoracic Vascular Surgery)
37 years experience
Dover, DE

Dr. Orville Hamilton

49 years experience
Dover, DE

Dr. Bruce Bolasny

47 years experience
Dover, DE
Search All Similar Doctors
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 2 office locations.
Dr. John Mannion practices Thoracic Surgery and Cardiothoracic Vascular Surgery near Dover, DE.
Additional practice locations include: Philadelphia, PA.
See Dover Cardiothoracic Surgeons.