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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).

Learn more about Dr. Chang-Gyu Hahn:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

  • Currently 4 of 4 stars
Patient comments (0)

The overall average patient rating of Dr. Chang-Gyu Hahn is Excellent. Dr. Hahn has been reviewed by 3 patients who have provided 0 comments. The rating is 4 out of 4 stars.

Patient Ratings
Ease of Appointment 3.0
  • Currently 3 of 4 stars
Promptness 3.5
  • Currently 3.5 of 4 stars
Courteous Staff 4.0
  • Currently 4 of 4 stars
Accurate Diagnosis 4.0
  • Currently 4 of 4 stars
Bedside Manner 4.0
  • Currently 4 of 4 stars
Spends Time with Me 4.0
  • Currently 4 of 4 stars
Follows Up After Visit 3.5
  • Currently 3.5 of 4 stars

Education & Awards

Dr. Hahn graduated from Seoul National University.


Dr. Hahn has 5 hospital affiliations:

  • Hospital of the University of PA 
  • University of PA Medical Center/Presbyterian 


  • Korean

> > > > Dr. Chang-Gyu Hahn, MD, PHD

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Additional Information
Dr. Chang-Gyu Gyu Hahn MD and PHD is a male Psychiatrist, has 29 years of experience and practices in Psychiatry.
Where does Dr. Chang-Gyu G. Hahn practice?
Dr. Chang-Gyu Hahn has 2 office locations.
Dr. Chang-Gyu Hahn practices Psychiatry near Philadelphia, PA.
See Philadelphia Psychiatrists.