Please contact the MSKCC portal helpdesk for further support. ... or email us at mymsk@mskcc.org. You can also call the MyMSK Help Desk toll free at 646-227-2593 in New York City, or call toll free outside New York City at 800-248-0593, Monday through Friday, between 9:00 AM and 5:00 PM (Eastern Time). ... Memorial Sloan Kettering Cancer Center ....