Mount Sinai Health System and the Nashville, Tenn.-based Contessa, an Amedisys company and home-based care provider, have announced that theyare combining Mount Sinai South Nassau’s home health agency into their existing joint venture. The new offering, called Mount Sinai at Home, will offer home health, hospitalization at home, rehabilitation at home (vs. care at a nursing facility), and palliative care at home, in the New York metro area.