The east end of TN 156 is currently at US 41/64/72 in TM, after a brief concurrency with TN 134.
I can't find a route log on TNDOT's website, but I was up there yesterday and everything I saw suggested that 156 actually ends at the junction with 134, which continues alone to the US highways. In particular, there is an END sign northbound at the 134/156 intersection: