Dr. Eugene S. Ahn

Eugene S. Ahn

Eugene S. Ahn
Eugene S.
Radiation Oncologist

Languages spoken


Expert in

Radiation Oncology

Interested in

Head and Neck cancer, Breast cancer, Brain tumors, Brachytherapy and Gamma Knife



Simi Valley (Radiation oncology)
Simi Valley (Radiation oncology)

2985 North Sycamore Dr.
Simi Valley, California 93065

34.28977079289876, -118.74543447116463

Dr. Ahn is board certified in therapeutic radiology. He has practiced in Ventura County since 2003 and has taken care of patients with all major cancer diagnoses. Dr. Ahn does have specialty training in stereotactic radiosurgery and has published on radiosurgery. He is Vice President of Coastal Radiation Oncology Medical Group, the medical director of Coastal’s Simi Valley Radiation Oncology Center, in collaboration with GenesisCare, and is co-medical director of the Los Robles Gamma Knife Center in Thousand Oaks. 

Career positions

Current position(s)
  • Coastal Radiation Oncology - Radiation Oncologist, Simi Valley, California


  • University of Washington, Bachelor of Arts, Political Science, Seattle
  • New York University Graduate School of Arts and Sciences, Master of Arts, Philosophy with concentration in Medical Ethics and Health Policy, New York
  • New York University School of Medicine, Doctor of Medicine, New York
  • UCLA Medical Center, Radiation Oncology, Los Angeles
  • New York University Downtown Hospital, PGY-1 in Internal Medicine, New York

Professional associations

  • American Society For Therapeutic Radiology And Oncology


Awards and honors

  • Cum Laude Graduate
  • Phi Beta Kappa
  • Elie Wiesel Award for best essay in Ethics

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