Originally Posted by flyupfrnt

Yea they are transferable: Because I am a proud member of the lounge and also a recipient of complimentary codes I asked this same question of the staff at the N lounge in Seattle last week.

They said that "as long as the person you give the code to has BOTH your mileage plan # and the specific code you gifted to them than that is best"

There are other workarounds but if your intent is to share the codes with friends or family as a "treat" than that is the information that will make their visit easiest from the outset.