What are the Chicago Police Department 10 codes?

These are the 10-codes for most police departments.


10-01 UNABLE TO COPY 10-49 TRAFFIC LIGHT OUT
10-02 SIGNAL'S GOOD 10-50 ACCIDENT
10-03 STOP TRANSMITTING 10-51 WRECKER NEEDED
10-04 ACKNOWLEDGEMENT 10-52 AMBULANCE NEEDED
10-05 RELAY 10-53 ROADBLOCKED
10-06 BUSY, STANDBY 10-54 LIVESTOCK ON HIGHWAY
10-07 OUT OF SERVICE 10-55 INTOXICATED DRIVER
10-08 IN SERVICE 10-56 INTOXICATED PEDESTRIAN
10-09 REPEAT 10-57 HIT AND RUN
10-10 FIGHT IN PROGRESS 10-58 DIRECT TRAFFIC
10-11 DOG CHASE 10-59 CONVOY/ESCORT/SHUTTLE
10-12 STANDBY 10-60 SQUAD IN VICINITY
10-13 WEATHER & ROAD REPORT 10-61 PERSONNEL IN AREA
10-14 REPORT OF PROWLER 10-62 REPLY TO MESSAGE
10-15 CIVIL DISTURBANCE 10-63 MAKE A WRITTEN COPY
10-16 DOMESTIC TROUBLE 10-64 MESSAGE FOR LOCAL DELIVER
10-17 MEET COMPLAINANT 10-65 MESSAGE ASSIGNMENT
10-18 COMPLETE ASSIGNMENT 10-66 MESSAGE CANCELLATION
10-19 RETURN TO ___________ 10-67 CLEAR TO READ MESSAGE
10-20 LOCATION 10-68 DISPATCH INFORMATION
10-21 CALL BYPHONE 10-69 MESSAGE RECEIVED
10-22 DISREGARD 10-70 FIRE ALARM
10-23 ARRIVED AT SCENE 10-71 ADVISE NATURE OF FIRE
10-24 ASSIGNMENT COMPLETED 10-72 REPORT PROGRESS ON FIRE
10-25 REPORT IN PERSON TO 10-73 SMOKE REPORT
10-26 DETAINING SUBJECT 10-74 NEGATIVE
10-27 DRIVERS LICENSE INFO. 10-75 IN CONTACT WITH
10-28 VEHICLE REG. INFOR. 10-76 EN ROUTE
10-29 CHECK FOR WANTED 10-77 ESTIMATED TIME OF ARRIVAL
10-30 ILLEGAL USE OF RADIO 10-78 NEED ASSISTANCE
10-31 CRIME IN PROGRESS 10-79 NOTIFY CORONER
10-32 MAN WITH GUN 10-80 CHASE IN PROGRESS
10-33 EMERGENCY 10-82 RESERVE LODGING
10-34 RIOT 10-84 ARE YOU GOING TO MEET, ADVISE ETA
10-35 MAJOR CRIME ALERT 10-85 WILL BE LATE
10-36 CORRECT TIME 10-86 OFFICER ON DUTY
10-37 INVESTIGATE VEHICLE 10-87 PICK UP CHECKS
10-38 STOPPING VEHICLE 10-88 ADVISE PHONE# TO CONTACT
10-39 URGENT 10-89 BOMB THREAT
10-40 SILENT RUN 10-90 BANK ALARM
10-41 BEGINNING DUTY 10-91 UNNECESSARY USE OF RADIO
10-42 ENDING DUTY 10-92 IMPROPERLY PARKED VEHICLE
10-43 INFORMATION 10-93 BLOCKAGE
10-44 PERMSN TO LEAVE PATROL 10-94 DRAG RACING
10-45 ANIMAL CARCASS IN LANE @ 10-96 MENTAL SUBJECT
10-46 ASSIST MOTORIST 10-97 RADIO CHECK
10-47 EMERGENCY ROAD REPAIR 10-98 PRISON OR JAIL BREAK
10-48 TRAFFIC STANDARD REPAIR 10-99 EMERGENCY SECURE
10-100 WANTED INDIVIDUAL


improvement from a retired Chicago Cop
Chicago has not used most ten codes for over 40 years.
They prefer plain English when possible.


Here are the 3 ten codes used by Chicago.
10-1, officer needs emergency immediate assistance. This is the one that has been called when you see squad cars driving like maniacs coming out of nowhere.


10-4, I am a 2 man car and understand your message or assignment


10-99, I am a one man car and understand your message or assignment


The other codes you hear, like 19-P (paul) are ways of saying what happened to an assignment.
19 is other type of job, P is other police service (so 19-P is a catch all)


You can find all the assignment codes on line at the city of Chicago web site under police department directives.


The Fed, since the mas confusion on radios during 9/11, have been urging departments to change to plain language but the tradition, born of need when radio transmissions needed to be very short and were hard to hear, of 10 & 11 codes still holds on.