Put one more thing on your to-do list: If you don't log in to the IACS system every few months, your IACS access will be revoked. Background: "IACS is the security system CMS uses to register users and control issuance of User IDs, passwords and access to CMS web-based applications," such as the Provider Statistical & Reimbursement (PS&R) reporting system, RHHI Cahaba GBA notes in an e-mail to providers. "It is necessary to, at a minimum, log on to the IACS system with your user ID every 60 days in order to keep it active," Cahaba stresses in the message. If your access is revoked, you'll have to contact the IACS helpdesk.