About Kohei Hasegawa, MD

Dr. Kohei Hasegawa is an attending physician at the MGH Department of Emergency Medicine. He received his medical degree from Tokai University (Japan) and Master of Public Health degree from Harvard University.  Dr. Hasegawa completed his emergency medicine residency and research fellowship at Massachusetts General Hospital. Dr. Hasegawa is additionally an Associate Professor of Emergency Medicine at Harvard Medical School.

Dr. Hasegawa is an active clinician-scientist with 200+ publications and multiple NIH R01 grants. He is the founder/director of the Japanese Emergency Medicine Network (JEMNet) and a faculty member of Emergency Medicine Network (EMNet), multi-center collaborations that aim to improve public health through projects in emergency care, particularly multicenter clinical research.

Departments, Centers, & Programs:

Clinical Interests:




Emergency Medicine**
55 Fruit Street
Boston, MA 02114-2696
Phone: 617-724-4100

Medical Education

  • MD, Tokai University School of Medicine
  • Residency, Brigham and Women's Hospital
  • Residency, Tokai University Hospital
  • Residency, U.S. Naval Hospital
  • Fellowship, Chigasaki Tokushukai General Hospital

American Board Certifications

  • Emergency Medicine, American Board of Emergency Medicine

Accepted Insurance Plans

Note: This provider may accept more insurance plans than shown; please call the practice to find out if your plan is accepted.


Dr. Hasegawa has made significant contributions to the field of airway and respiratory emergency research. He has assembled a team of researchers from more than 50 centers to conduct several large-scale studies of emergency airway management and acute asthma management in the US and Japan.  His work has been funded by NIH, industry, and foundations. 

He has published >180 peer-reviewed articles since 2012. His published manuscripts include first-author publications in the journals, such as JAMA, JACI, JACC, AJRCCM, Annals of Emergency Medicine, and Pediatrics.  In addition to these original research papers, he has published more than 40 reviews, textbook chapters, and editorials.