Cascade Internal Medicine Specialists. 2239 NE Doctors Dr. Suite 200. Bend, Oregon 97701. ph 541.318.0124 | fx 541.318.0188. Dr. Mark Backus | Dr. Sanaz Askari. Home; Providers; Services; Insurance; Patient Forms; Patient Portal; Staff; Contact Us; Patient Portal. Please click here to access your information through the Patient Portal for non ....