You can also call 833-920-3234 for help signing up. For current MSK patients or caregivers, ask a Care Coordinator (CC) to help you set up an account or to speak to the doctor's office. You can also contact the Help Desk by email at mymsk@mskcc.org or by phone at 646-227-2593. Book traversal links for Becoming a Patient.Patient Login‧Mymsk Login Page‧Video Details.