Here is the story for the Washington Post. President Obama appointed Dr. Donald Berwick using a recess appointment in July of 2010. His recess appointment was set to expire on December 31st, 2011. In the face of heavy Republican opposition to confirm his appointment, Dr. Berwick announced his resignation effective December 2nd.
The White House will nominate Marilyn Tavenner as the new head for CMS, however, the process for confirming the nomination may take some time. Ms. Tavenner is currently serving as Medicare’s deputy administrator.