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Allergy & Immunology Specialist, Internist, Critical Care Specialist
22 years of experience
Video profile
Accepting new patients
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 (1)

The overall average patient rating of Dr. John Hagan is Excellent. Dr. Hagan has been reviewed by 1 patients who have provided 1 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 5.0
Promptness 5.0
Courteous Staff 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. John Hagan, MD is board certified in Allergy & Immunology, Internal Medicine, and Critical Care Medicine.

  • He has special expertise in 7 areas:
  • Anaphylaxis
  • Asthma
  • Drug Eruptions
  • Hay Fever (Seasonal Allergic Rhinitis)
  • Hives (Urticaria)
  • Latex Allergy (Latex Hypersensitivity)
  • Nasal Allergy (Rhinitis)

Education & Awards

Dr. Hagan graduated from University of Tennessee, Memphis.


Dr. Hagan has 9 hospital affiliations:

  • Rochester Methodist Hospital 
  • St Marys Hospital - Rochester 

> > > > Dr. John Hagan, MD

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Additional Information
Dr. John B Hagan MD is a male Allergist & Immunologist, has 22 years of experience and practices in Allergy & Immunology, Internal Medicine, Allergy & Immunology, and Critical Care Medicine.
Where does Dr. John B. Hagan practice?
Dr. John Hagan has 10 office locations.
Dr. John Hagan practices Allergy & Immunology, Internal Medicine, Allergy & Immunology, and Critical Care Medicine near Rochester, MN.
Additional practice locations include: Kenyon, MN and Kasson, MN.
See Rochester Allergists, Rochester Internists, and Rochester Critical Care Practitioners.