Top trader Najarian: Buy this health-care stock

CNBC "Halftime Report" trader Jon Najarian purchased shares of Community Health Systems for his model portfolio.

Community Health Systems is a leading health-care company that owns or operates 197 affiliated hospitals with a total 30,000 beds.

In other moves on Tuesday and Wednesday, Najarian sold his model portfolio position in Celgene in the CNBC trader competition.

Here's why Najarian bought the health-care stock.