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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 (1)

The overall average patient rating of Dr. Harold Diaz is Good. Dr. Diaz has been reviewed by 2 patients who have provided 1 comments. The rating is 3.5 out of 5 stars.

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

Specialties & Research

  • He has special expertise in 2 areas:
  • Asthma
  • Nasal Allergy (Rhinitis)

Education & Awards

Dr. Diaz graduated from Universidad Pontificia Bolivariana, Medellin.


Dr. Diaz has 3 hospital affiliations:

  • Michael Reese Hospital And Medical Center 
  • Thorek Hospital And Medical Center 
  • Thorek Memorial Hospital 


  • English
  • Spanish

> > > > Dr. Harold Diaz, MD

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Additional Information
Dr. Harold Rene Diaz MD is a male Internist, has 22 years of experience and practices in Internal Medicine.
Where does Dr. Harold R. Diaz practice?
Dr. Harold Diaz has 2 office locations.
Dr. Harold Diaz practices Internal Medicine near Chicago, IL.
See Chicago Internists.