Gerrard and his team-mates were handed the document during a team meeting at St George's Park last Monday.
However, in theory, Gerrard feels the England players now know where they stand.
"We had a meeting at St George's Park last week and now have the code of conduct in writing," said Gerrard.
"We know we have to behave and there's no excuse any more.
"We've not spoken about it (as a group). It's common sense.
"It's important we do behave away from the pitch."
After a year when a consistent thread running through England gatherings has been player discipline of varying kinds, Gerrard feels it is time to get the focus back on the football.
"It is critical," said Gerrard.
"These games and these get-togethers are very important and we'd rather be sitting here answering questions about football."
South Korean media blamed Iran for angry scenes at a tense FIFA World Cup qualifier which ended with fans pelting debris on to the pitch and the visiting coach under fire for a rude gesture.