In the standard APCO (Association of Public-Safety Communications Officials) ten-code system, the 10-22 cop code stands for "Disregard" or "Cancel." It is primarily used by dispatchers and law enforcement officers to instruct units to ignore a previous transmission, cancel a response to a call, or nullify a specific directive that is no longer applicable.
The world of law enforcement communication is built on a foundation of brevity, clarity, and standardized signals. Among the most ubiquitous tools in this field are the "ten-codes," a shorthand system designed to convey complex information in seconds. While modern policing in 2026 has seen a significant shift toward "plain talk" or "clear speech," the 10-22 code remains a staple in many jurisdictions. To understand why this specific code is used, one must look at the history of radio communications, the technical requirements of public safety broadcasting, and the operational nuances of the modern patrol officer.
The Origins and Evolution of the Ten-Code System
The ten-code system, including the 10-22 code, was not an arbitrary invention but a solution to a technical limitation. Developed in 1937 by Charles Hopper, a communications director for the Illinois State Police, these codes were created to address the unreliability of early radio transmissions.
In the 1930s and 40s, radio sets in patrol cars were often inconsistent. The first syllable of a transmission was frequently cut off or distorted as the vacuum tubes in the radio warmed up or the transmitter stabilized. By prefixing every command with "ten-," the speaker allowed the equipment a fraction of a second to engage, ensuring that the critical part of the message—the numbers following the "ten"—was heard clearly.
The code 10-22 was established as part of the APCO Project Two, which aimed to standardize these signals across the United States. Before this standardization, a code in one county might mean something entirely different in the next, leading to dangerous confusion during multi-agency pursuits or emergencies. 10-22 was designated as the universal signal for "cancel last message" or "disregard."
The Mechanics of 10-22: When and Why It Is Used
In a high-pressure environment, a 10-22 transmission serves as a vital operational "reset" button. There are several specific scenarios where an officer or a dispatcher would utilize this code:
1. Cancellation of Emergency Responses
If a patrol unit is "running hot" (using lights and sirens) to a reported burglary in progress, and a second unit arrives to find it was a false alarm caused by a homeowner, the dispatcher will broadcast: "All units, 10-22 on the 211 (robbery) at 123 Main Street." This immediately signals all responding officers to cease their emergency response, reducing the risk of high-speed traffic accidents and freeing them up for other calls.
2. Disregarding Information
Often, information provided by a witness or a caller is found to be inaccurate shortly after it is broadcast. A dispatcher might describe a suspect vehicle as a "Red Ford F-150." If the caller then corrects themselves to say it was a "Maroon Chevy Silverado," the dispatcher may say, "10-22 on the Ford, suspect vehicle is now a Maroon Chevy."
3. Duplicate Calls for Service
In the era of smartphones, 911 centers often receive dozens of calls for a single visible incident, such as a brush fire or a major traffic collision. Once the initial report is processed and units are dispatched, the dispatcher will 10-22 any subsequent "duplicate" entries for the same event to keep the radio traffic clear.
4. Administrative Nullification
A 10-22 can also be used for administrative purposes, such as canceling a meeting, a training session, or a request for a supervisor's presence at a scene if the situation stabilizes before the supervisor arrives.
Jurisdictional Variations and the "Drowning" Exception
While the APCO standard for 10-22 is "Disregard," it is critical to recognize that ten-codes are not a legal requirement, and departments are free to modify them. This creates a "dialect" system within law enforcement.
The most notable variation historically appeared in parts of California and some East Coast agencies. In certain older manuals for the California Highway Patrol (CHP) or specific regional task forces, 10-22 was occasionally used to signify a "Drowning" or a "Water Rescue." However, in 2026, most of these agencies have transitioned to the APCO standard or clear language to avoid the potentially catastrophic results of a dispatcher saying "10-22" (meaning disregard) while an officer thinks they are being sent to a drowning.
Always check the specific Standard Operating Procedures (SOP) of a local department to verify their "code sheet." For civilians using scanners or hobbyists, the APCO "Disregard" meaning is the most reliable interpretation in 95% of North American jurisdictions.
Technical Comparison of Common Ten-Codes
To understand where 10-22 fits in the hierarchy of communication, it helps to compare it to other frequently used codes that involve the status of a call or an officer.
| Code | Standard Meaning | Contextual Application |
|---|---|---|
| 10-4 | Acknowledgement | Confirms that the message was received; does not mean "yes." |
| 10-7 | Out of Service | The officer is busy or off-duty and cannot take calls. |
| 10-8 | In Service | The officer is available for assignment. |
| 10-19 | Return to Station | Used to recall an officer to the precinct or headquarters. |
| 10-20 | Location | Requests the current geographic coordinates of the unit. |
| 10-22 | Disregard / Cancel | Nullifies the previous instruction or information. |
| 10-33 | Emergency / Officer Needs Help | High-priority signal that overrides all other radio traffic. |
| 10-97 | Arrived at Scene | Confirms the unit is on-site and beginning the investigation. |
The 2026 Perspective: The Shift to Plain Talk (Clear Speech)
As we look at the landscape of law enforcement in 2026, the use of 10-22 and other ten-codes is actually declining. This shift is driven by the National Incident Management System (NIMS) and the Incident Command System (ICS) guidelines established by FEMA.
Interoperability Challenges
The primary reason for moving away from 10-22 in favor of the word "Cancel" is interoperability. During a major disaster—such as a hurricane, a massive wildfire, or a multi-state manhunt—officers from different agencies must work together. If a State Trooper uses 10-22 to mean "Disregard," but a local specialist unit uses it to mean "Drowning," the resulting confusion can be deadly.
Accuracy in Stressful Environments
Psychological studies on high-stress communication have shown that the human brain processes "Clear Speech" faster than it decodes numerical codes. In 2026, many departments have adopted a "Hybrid Model," where common codes like 10-4 (Acknowledged) and 10-20 (Location) are kept for brevity, but instructional codes like 10-22 are replaced with "Cancel" or "Disregard" to ensure there is no room for error.
The Role of 10-22 in Modern Digital Dispatch (CAD)
In 2026, the 10-22 code is not just spoken; it is a digital command. Most patrol vehicles are equipped with a Mobile Data Terminal (MDT) linked to a Computer-Aided Dispatch (CAD) system.
When a dispatcher decides to 10-22 a call, they don't just say it over the air. They enter a command into the CAD system that physically removes the call from the officer’s screen. This digital 10-22 creates a permanent timestamped record. For legal and liability reasons, "10-22ing" a call is a serious action. If a call is canceled and a crime subsequently occurs because the police did not arrive, the CAD logs will be used to determine who initiated the 10-22 and why.
Training and Memorization for New Officers
Recruits in police academies are still required to memorize the ten-code list, including 10-22, as part of their basic communications training. The process usually involves:
- Rote Memorization: Using flashcards and verbal drills to link the number to the meaning.
- Scenario Training: Listening to recorded radio traffic and identifying when a 10-22 is appropriate.
- Radio Discipline: Learning the "Pause-Listen-Think-Speak" method. Officers are taught never to 10-22 their own call without providing a reason (e.g., "Unit 12, 10-22 my request for a tow, vehicle is now mobile").
Common Misconceptions About the 10-22 Code
There are several myths surrounding the 10-22 code, often perpetuated by television and movies:
- Myth: 10-22 means "Mission Accomplished." It does not. It specifically means to disregard or cancel an ongoing process.
- Myth: 10-22 is used to hide information from the public. While codes do offer some obfuscation, the primary goal of 10-22 is brevity, not secrecy. In the age of digital encryption, departments don't need 10-codes to stay private.
- Myth: You can 10-22 a 10-33. You almost never "disregard" an officer’s call for emergency help (10-33) via a simple 10-22 until that officer is physically confirmed to be safe ("Code 4").
Frequently Asked Questions
Is 10-22 the same as "Code 4"?
No. While both can result in units stopping their response, they mean different things. 10-22 means "Disregard/Cancel the call entirely." Code 4 means "The situation is under control/No further assistance is needed." An officer might arrive at a scene and broadcast "Code 4," which then prompts the dispatcher to 10-22 the remaining units who were still en route.
Why do some departments still use 10-22 instead of just saying "Cancel"?
Tradition and speed play a large role. For veteran officers, "Ten-Twenty-Two" is a single rhythmic phrase that is ingrained in their muscle memory. Furthermore, on crowded radio channels, the sharp, percussive sounds of the numbers "10-22" can sometimes cut through static better than the softer vowel sounds in the word "Cancel."
Can a civilian use the 10-22 code?
While anyone can buy a radio, using police codes on public frequencies or attempting to communicate with dispatchers is illegal and constitutes "Interfering with a Public Safety Officer." Understanding the code is useful for those listening to scanners for situational awareness, but it should never be used by non-professionals to communicate with authorities.
What should I do if I hear "10-22" on a scanner regarding a call near my house?
It generally means the police have determined the incident does not require their presence or the initial report was unfounded. It is a sign that the "emergency" status of that specific event has ended.
Does 10-22 apply to fire and EMS as well?
Many Fire and EMS departments have moved away from ten-codes entirely, preferring "Clear Text." However, in agencies where police and EMS share a dispatch center, you may hear EMS units acknowledging a 10-22 if a medical call is determined to be a "no-patient-found" situation.
Summary of Actionable Knowledge
If you are a student of criminal justice, a new recruit, or a citizen interested in public safety, the most important takeaway regarding the 10-22 code is its role as a nullifier. It is the "delete" key of the radio world.
- In an official capacity: Always use 10-22 according to your local department's code sheet, but be prepared to use "Plain Talk" (Clear Speech) if you are working with outside agencies.
- In a monitoring capacity: Interpret 10-22 as a cancellation of the previous activity. It indicates a reduction in urgency or a correction of data.
In the fast-evolving landscape of 2026, where AI and automated dispatch systems are becoming more common, the human element of radio communication still relies on these 90-year-old signals to maintain order in the chaos of emergency response.
