10-codes are standardized radio communication codes commonly used by law enforcement and emergency services to convey information quickly and clearly.

10-X — General Status
10-0 Caution 10-1 Signal Weak 10-2 Signal Good 10-3 Stop Transmitting 10-4 Acknowledged 10-5 Relay Message 10-6 Busy 10-7 Out of Service 10-8 In Service 10-9 Repeat
10-1X — Location & Response
10-10 Fight in Progress 10-11 Traffic Stop 10-12 Stand By 10-13 Weather Conditions 10-14 Prowler 10-15 Prisoner in Custody 10-16 Domestic Problem 10-17 Meet Complainant 10-18 Urgent 10-19 Return to Station
10-2X — Personnel & Requests
10-20 Location 10-21 Call by Phone 10-22 Disregard 10-23 Arrived on Scene 10-24 Assignment Complete 10-25 Contact HQ 10-26 Detaining Subject 10-27 Driver License Info 10-28 Vehicle Info 10-29 Wants/Warrants
10-3X — Emergencies
10-30 Unnecessary Use of Radio 10-31 Crime in Progress 10-32 Man with Gun 10-33 Emergency 10-34 Riot 10-35 Major Crime Alert 10-36 Correct Time 10-37 Identify Operator 10-38 Stopping Vehicle 10-39 Urgent Use of Lights
10-4X — Assistance
10-40 Silent Run 10-41 Beginning Shift 10-42 Ending Shift 10-43 Info 10-44 Permission to Leave 10-45 Animal Carcass 10-46 Motorist Assist 10-47 Emergency Road Repair 10-48 Traffic Control 10-49 Proceed to Scene
10-5X — Administrative
10-50 Accident 10-51 Wrecker Needed 10-52 Ambulance Needed 10-53 Road Blocked 10-54 Livestock 10-55 Intoxicated Driver 10-56 Intoxicated Pedestrian 10-57 Hit and Run 10-58 Direct Traffic 10-59 Convoy Escort
10-6X — Surveillance & Status
10-60 Subject Check 10-61 Miscellaneous Public Service 10-62 Meet with Subject 10-63 Prepare to Copy 10-64 Found Property 10-65 Missing Person 10-66 Suspicious Person 10-67 Person Calling Officer 10-68 Dispatch Information 10-69 Message Received
10-7X — Operations & Support
10-70 Fire Alarm 10-71 Advise Nature of Fire 10-72 Report Progress 10-73 Smoke Report 10-74 Negative 10-75 Meeting with Contact 10-76 En Route 10-77 ETA 10-78 Need Assistance 10-79 Notify Coroner
10-8X — Coordination & Security
10-80 Chase in Progress 10-81 Breathalyzer Request 10-82 Reserve Lodging 10-83 Work School Crossing 10-84 If Meeting Advise ETA 10-85 Delayed 10-86 Officer on Duty 10-87 Pick Up / Deliver 10-88 Present Telephone Number 10-89 Bomb Threat
10-9X — Critical & Tactical
10-90 Bank Alarm 10-91 Pick Up Prisoner 10-92 Improperly Parked Vehicle 10-93 Blockade 10-94 Drag Racing 10-95 Prisoner in Custody 10-96 Mental Subject 10-97 Arrived at Scene 10-98 Assignment Complete 10-99 Officer Needs Help