Google "Medicare" + "physical therapy" and you'll get the answer (from the horse's mouth [Medicare] itself).
This is not directed at the OP in particular, but more like a general observation. Too many people ask a question which can be easily answered in a few seconds by doing an internet search. Some of you may remember the Stone Age where researching anything meant a trip to the campus library and pawing through dusty index cards to locate a specific microfilm spool... Thank God those days are over. The internet makes looking up things so much easier. Use it.