These are the many "10 Codes" I have collected from many, many places.  They may differ for your location.
10- 1 = receiving poorly
10- 2 = receiving fine
10- 3 = stop transmitting
10- 4 = received
10- 5 = standy by / relay message
10- 6 = busy / stand by
10- 7 = out of service
10- 8 = in service
10- 9 = repeat last message
10-10 = negative
10-11 = on duty
10-12 = stand by
10-13 = existing conditions
10-14 = message / information
10-15 = message delivered
10-16 = reply to message
10-17 = en route
10-18 = urgent
10-19 = in control / return to station
10-20 = what's your location
10-21 = call by phone
10-22 = disregaurd
10-23 = arrived at scene
10-24 = assignment completed
10-25 = report / return to station
10-26 = eta
10-27 = license info
10-28 = vehicle license info
10-29 = wants / warrents check
10-30 = danger / caution
10-31 = pick up
10-32 = units needed
10-33 - emergency
10-34 = time check
10-37 = intoxicated person
10-40 = advise if xxx is on station
10-42 = doesn't conform to regulations
10-43 = advised road & weather conditions
10-44 = stations involved, acknowledge
10-45 = accident
10-46 = holding subject, rush reply
10-47 = send ambulance
10-60 = subject negative
10-61 = subject has record, not wanted
10-62 = subject possibly wanted
10-63 = sugject wanted
10-64 = proceed w/ caution
10-65 = assist
10-66 = subject in observation catagory
10-67 = subject in parole catagory
10-68 = subject in charged catagory
10-88 = package for xxx
10-89 = xxx is calling you
10-97 = radio check
10-99 = emergency
signal 33 = help me quickly
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