Notices & 60 spell of illness?

If a resident has been on medicare A for a few weeks and now no longer needs skilled care , & is still a resident of the nuring home,are there any notices that need to be given? The doctor DC'd skilled services, do we need to do anything else? On the 60 day spell of illness, does it start on the day he was Dc'd and what exactly does it mean? It is confusing.. Thanks..from colorado