CMS learned of a MAXIMUS breach effecting 407,000 beneficiaries. 
Impacted beneficiaries will be issued a new Medicare number accompanied by a letter.  (View HERE) The letter asks beneficiaries to:
  1. begin using the new Medicare number on December 29th and
  2. alert providers of their new Medicare number.
Plans will receive the related enrollment codes alerting them about the Medicare number changes. Plans have a process in place to update their internal systems accordingly.  The 1-800-Medicare team has been notified.

Additional detail related to specific plans, beneficiaries, or geographical information are not available.

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