Ten-codes, also known as 10-codes or ten signals, are code words used by many police officers to aid with voice communication. The codes were originally developed in 1937 to allow for brevity, clarity, and standardization of messages transmitted over radio channels. On old radio systems, channels were limited so messages needed to be short. Also, the first syllable of speech was often not transmitted, so the syllable “ten” was prefixed to all numeric codes to ensure that the important information would be received.
Despite their usefulness, the exact meaning of ten-codes often varies between jurisdictions and locations. In addition to law enforcement, ten-codes are frequently used on Citizens’ Band (CB) radio. One of the most frequently used ten-codes, 10-4, has become popular enough to sometimes be used in every-day language.
Code | Meaning |
---|---|
10-2000 | Police required immediately |
10-200 | Narcotics, drugs involved |
10-112 | Impersonating an officer |
10-110 | Juvenile disturbance |
10-109 | Suicide |
10-108 | Officer down / Officer in danger |
10-107 | Suspicious person |
10-106 | Obscenity |
10-103m | Disturbance by a mental person |
10-103f | Disturbance by fight |
10-103 | Disturbance |
10-102 | Cruelty to animals |
10-101 | Ending security check |
10-100 | Misdemeanor warrant / Out using restroom |
10-99 | Cardiac arrest / Officer held hostage |
10-98 | Assignment complete / Prison break |
10-97 | Arrived at scene / Recorded information |
10-96 | Mental patient / Detain suspect |
10-95 | Officer’s residence |
10-94 | Street racing |
10-93 | Blockage |
10-92 | Subject in custody / Parking violation |
10-91v | Animal – vicious |
10-91i | Animal – leash law violation |
10-91j | Animal – pickup collect |
10-91g | Animal – pickup |
10-91e | Animal – bite |
10-91d | Animal – dead |
10-91c | Animal – injured |
10-91b | Animal – noisy |
10-91a | Animal – stray |
10-91 | Pick up subject / Prepare for inspection / Animal |
10-90 | Alarm going off / Bank alarm |
10-89 | Bomb threat |
10-88 | Advise phone number of the officer |
10-87 | Give call letters to your station |
10-86 | Officer on-duty |
10-85 | Arrival delay due to [cause] |
10-84 | Advise ETA |
10-83 | Work/school crossing detail |
10-82 | Reserve lodging |
10-81 | A traffic stop initiated / Breathalyzer request |
10-80a | Assist radio dispatcher |
10-80 | Pursuit in progress |
10-79 | Notify coroner / Bomb threat |
10-78 | Need assistance / Send an ambulance |
10-77 | Estimated Time of Arrival |
10-76 | En route to the location |
10-75 | Severe weather statement |
10-74 | Negative / Theft |
10-73 | How do you copy / Smoke report? |
10-72 | Report progress of fire / Gun involved / D.O.A. |
10-71 | Advise nature of fire / Shooting |
10-70 | Fire alarm / Prowler |
10-69 | Clear to copy transmission? |
10-68 | Dispatch message |
10-67 | Clear for the next message |
10-66 | Check officer’s well-being |
10-65 | Net message assignment |
10-64 | Subject wanted / Found Property |
10-63 | Subject positive / Prepare to copy |
10-62 | Subject possibly wanted |
10-61 | Personnel in the vicinity / Not Wanted |
10-60 | Squad in vicinity |
10-59 | Escort or convoy / Security check |
10-58 | Direct Traffic |
10-57 | Hit and run accident / Missing person |
10-56a | Suicide attempt |
10-56 | Intoxicated pedestrian / Suicide |
10-55d | Send coroner |
10-55 | Intoxicated driver |
10-54d | Possible dead body |
10-54 | Possible fatality |
10-53 | Road blocked / Man down |
10-52 | Ambulance needed |
10-51 | Tow truck needed / under the influence of alcohol |
10-50 | Officer welfare check / under the influence of drugs |
10-49 | Traffic light out |
10-48 | Traffic control |
10-47 | Emergency road repair |
10-46 | Motorist assist |
10-45d | Condition of patient – Dead |
10-45c | Condition of patient – Critical |
10-45b | Condition of patient – Serious |
10-45a | Condition of patient – Good |
10-45 | Condition of patient |
10-44 | Permission to leave patrol |
10-43 | Information |
10-42 | End duty |
10-41 | Begin duty |
10-39 | Run with lights and siren |
10-38 | Traffic stop |
10-37 | Identify yourself / suspicious vehicle |
10-36 | Provide the current time of day |
10-35 | Confidential information or open window |
10-34 | Open door or window / Riot |
10-33 | Emergency, all units stand by |
10-32 | Person with Gun |
10-31 | Crime in progress/pursuit |
10-30 | Does not conform to rules or regulations |
10-29v | Vehicle wanted |
10-29r | Check wants and record, subject [PIN, CJIC] |
10-29m | Subject wanted, misdemeanor |
10-29h | The hazard potential from subject |
10-29f | Subject wanted, felony |
10-29c | Check complete, subject [NCIC] |
10-29a | Check wants, subject [PIN] |
10-29 | Request arrests/warrants check |
10-28 | Check the registration on the vehicle |
10-27 | Request driver’s license check |
10-26 | Detaining suspect / Check auto registration |
10-25 | Report to [person] / Do you have contact with [person] |
10-24 | Emergency backup / Emergency at the station |
10-23 | Arrived at scene / Stand by until channel clears |
10-22 | Disregard / Cancel the last message |
10-21b | Call your home |
10-21a | Advise home I will return at [ETA] |
10-21 | Call by telephone |
10-20 | Your Location |
10-19 | Return to station or location |
10-18 | Urgent / Complete present assignment ASAP |
10-17 | Pick up papers / En route |
10-16 | Pick up prisoner / Reply to message |
10-15m | Prisoner in custody (mental case) |
10-15 | Prisoner in custody / Message delivered |
10-14 | Convoy or escort detail / Suspicious person |
10-13 | Advise weather and road conditions |
10-12 | Standby / Visitor(s) present |
10-11 | Identify frequency / Dispatching too fast |
10-10 | Negative / Fight in progress |
10-9 | Repeat last message |
10-8ot | In service (over time) |
10-8 | In service |
10-7od | Out of service (off duty) |
10-7c | Out of service (court) |
10-7b | Out of service (personal) |
10-7 | Out of service (completely) |
10-6 | Busy / Out at call |
10-5 | Relay message to [person] |
10-4 | Affirmative / Understood / Message received |
10-3 | Stop transmitting |
10-2 | You are being received clearly / Signal is strong |
10-1 | You are being received poorly / Cannot copy |
10-0 | Use caution |
10-00 | Officer down, all patrols respond |
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