1099-R

How do i file if 1099r  if  from a  401 K as to not get penalized because retired and disabled but under 59. they did list the full amount. in item 1 and 2a  that was withdrtawn to close out. I just wanted to make sure i am not required an additional 10% penalty.  How would I know? I dont see on 1099-R form?