The Collaborative International Dictionary of English v.0.48:

Noncontagious \Non`con*ta"gious\, a.
   Not contagious; not catching; not communicable by contact. --
   Non`con*ta"gious*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

noncontagious
    adj 1: (of disease) not capable of being passed on [syn:
           noncommunicable, noncontagious, nontransmissible]