About Diane Clausen, MD Dr. Diane Clausen MD (she/her) is a hematology and oncology specialist in Port Jefferson Station, NY. For new and existing patients, please see recommendations on how to schedule an appointment with Dr. Clausen online. As a hematology and oncology specialist, she may specialize in Anemia and Polycythemia, in addition to other conditions. According to our records, Dr. Clausen performs Chemotherapy, Nuclear Medicine Imaging, and other procedures. For insurance coverage, she accepts Medicare. Dr. Clausen has been practicing for over 32 years since graduating from State University of New York at Stony Brook School of Medicine and getting her license to practice in New York.