Ralph Philip Ermoian M.D. Accepting new patients

Accepting new patients Make an Appointment

Pediatric oncology, Radiation oncology




Ralph Ermoian, M.D., is a board certified physician and lead for pediatric and childhood tumors with Radiation Oncology Services at UW Medical Center, Seattle Children’s Hospital and SCCA Proton Therapy. He is also a UW associate professor of Radiation Oncology and an adjunct associate professor of Pediatrics.

Dr. Ermoian treats pediatric patients with brain tumors, blood tumors requiring stem cell transplants, and salivary gland tumors. He wants to provide the same care he would want and expect of his own healthcare providers if he had cancer—compassionate, detail-oriented, and patient-centered care that is tailored to the patient’s medical needs and goals.

 Dr. Ermoian earned his M.D. at UC San Francisco.

Personal Interests

I enjoy spending time with my family, hiking and other outdoor activities.
Radiation Oncology Services at UWMC

Radiation Oncology Services at UWMC

1959 NE Pacific St., 1st Floor, NN 106 Seattle, WA 98195


Breast cancer, Cancer care, Gastrointestinal cancer, Liver and bile duct cancer care

Univ. of California, San Francisco

Medical education, 2003

Univ. of Calif. San Francisco (Ped.)

Residency, Pediatrics

Univ. of Calif. San Francisco


Univ. of Calif. Berkeley

Teaching Appointment

Children's Hospital Boston

Internship, Pediatrics

UW - Dept. of Radiation Oncology

Residency, Radiation Oncology


Board Certifications
  • Radiation Oncology, 2012, American Board of Radiology