Great news for Iran, which might not need to assemble its own nuclear warheads and instead could buy them off some shady salesperson in Bulgaria once they've been pilfered from the US.
I don't think there are any "nuclear codes". I think they might have been a thing at some point in history since the idea is so pervasive, but in a crisis you'd not want someone to have to figure out some non-trivial password before MAD doctrine can be applied.
Maybe I'm wrong, I know more about field tactics and guerilla warfare than grand strategy.
I remember reading somewhere (atlas obscura, maybe?) that the US military was much more scared of a rogue general launching a nuclear strike than of the USSR starting the war.
So I'm going to assume that there is _some_ kind of code.