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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 Constantine:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (3)

The overall average patient rating of Dr. John Constantine is Below Average. Dr. Constantine has been reviewed by 11 patients who have provided 3 comments. The rating is 2 out of 5 stars.

Patient Ratings
Ease of Appointment 4.1
Promptness 1.5
Courteous Staff 2.4
Accurate Diagnosis 1.9
Bedside Manner 1.3
Spends Time with Me 1.7
Follows Up After Visit 2.1

Specialties & Research

Dr. John Constantine, MD is board certified in Ophthalmology.

  • He has special expertise in 1 area:
  • Lens Implants (Intraocular Lens Implantation)

Education & Awards

Dr. Constantine graduated from State University of New York at Buffalo. He has 1 awards.

Castle Connolly's Top Doctors™ (2012 - 2013)


Dr. Constantine has 5 hospital affiliations:

  • Lowell General Hospital 
  • Saints Memorial Medical Center Inc 


  • Spanish
  • Vietnamese
  • Yiddish
  • Hindi
  • English
  • Italian
  • Greek
  • French

> > > > Dr. John Constantine, MD

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Additional Information
Dr. John B Constantine MD is a male Ophthalmologist, has 45 years of experience and practices in Ophthalmology.
Where does Dr. John B. Constantine practice?
Dr. John Constantine has 2 office locations.
Dr. John Constantine practices Ophthalmology near Chelmsford, MA.
Additional practice locations include: Andover, MA.
See Chelmsford Ophthalmologists.