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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. Gregg Cohan is Excellent. Dr. Cohan 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
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. Gregg Cohan, MD is board certified in Internal Medicine and Pulmonary Disease.

  • He has special expertise in 6 areas:
  • Asthma
  • Chronic Obstructive Pulmonary Disease (COPD)
  • Emphysema
  • Lung Cancer
  • Pulmonary Fibrosis
  • Sarcoidosis

Education & Awards

Dr. Cohan graduated from University of Chicago.


Dr. Cohan has 6 hospital affiliations:

  • Silver Cross Hospital 
  • Morris Hospital 


  • English

> > > > Dr. Gregg Cohan, MD

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Additional Information
Dr. Gregg R Cohan MD is a male Internist, has 25 years of experience and practices in Internal Medicine and Pulmonary Disease.
Where does Dr. Gregg R. Cohan practice?
Dr. Gregg Cohan has 5 office locations.
Dr. Gregg Cohan practices Internal Medicine and Pulmonary Disease near Joliet, IL.
See Joliet Internists and Joliet Pulmonologists.