I know in Dubuque the Code 1 would be Lights and siren, Code 2 would be rapid response but no siren and three would be regular response within a reasonable amount of time, if memory serves me right code 4 was within 4 hours and code 5 was by end of shift, but that was in the 80's, and they may have changed. However listening to calls Code 1-3 sounds the same, they also refer to code 200 which is either drugs or marijuana, but all the above applies to Dubuque, or did. You should be able to tell from the type of call a general idea what they are.