All codes start with 4-digits. For example, #4046 means avocado the world over. It is an internationally recognized code. If it is just those 4 numbers then you know it was conventionally grown (what conventional is might vary by country, of course). If this 4-digit number is preceded by a '9', such as #94046, then it is organic. If it is preceded by an '8', such as #84046 then it is genetically modified (GMO or GE).
I prefer to eat organic (not always possible on my budget) but now I can definitely steer clear of GMO crops. Also use the code to confirm that what the bin label says is actually what is in the bin.