The Medical group has plenty of great stocks, but investors should always be looking for companies that are outperforming their peers. Has Acadia Healthcare (ACHC) been one of those stocks this year? Let's take a closer look at the stock's year-to-date performance to find out.Acadia Healthcare is a member of the Medical sector. This group includes 1076 individual stocks and currently holds a Zacks Sector Rank of #6. The Zacks Sector Rank gauges the strength of our 16 individual sector groups by measuring th ...