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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

Patient comments (0)

The overall average patient rating of Dr. Chang-Gyu Hahn is Excellent. Dr. Hahn has been reviewed by 8 patients who have provided 0 comments. The rating is 4.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.3
Promptness 4.7
Courteous Staff 5.0
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 4.7

Specialties & Research

  • He has special expertise in 7 areas:
  • Attention Deficit Disorder (ADD) / Attention Deficit Hyperactivity Disorder (ADHD)
  • Bipolar Disorder / Manic Depressive Disorder
  • Depression
  • Depressive Disorder
  • Insomnia
  • Schizophrenia
  • Sleep Disorders

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 Hahn MD and PHD is a male Psychiatrist, has 31 years of experience and practices in Psychiatry.
Where does Dr. Chang-Gyu Hahn practice?
Dr. Chang-Gyu Hahn has 2 office locations.
Dr. Chang-Gyu Hahn practices Psychiatry near Philadelphia, PA.
See Philadelphia Psychiatrists.