Per CMS:
CMS will perform data center maintenance on Sunday, July 21, 2013. The maintenance window will begin at 2:00 AM ET on Sunday, July 21, 2013. The HETS Medicare A&B Eligibility system will be unavailable during this period. Attempts to open a connection to the Medicare A&B Eligibility application will result in errors. CMS estimates that the maintenance will be completed by 2:00 PM ET on Sunday, July 21, 2013.
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