Add one more item to this month's to-do list, if your contractor is National Government Services and you use FISS and DDE. You must undergo NGS User ID recertification by Nov. 30, the MAC says. You should have received an authorization access code via e-mail in early October, NGS says. More information on how to recertify is online at http://vgmaudithelp.com/blog/index.php/2011/10/2011-medicare-online-system-user-id-recertification.