When a police report describes your injury as “serious” or codes it at a particular severity level, that designation is not a casual judgment. It uses a standardized classification system that has specific definitions, affects how the crash is entered into statewide traffic databases, and can influence insurance claim processing and any subsequent legal proceedings. Understanding what each level means and how the classification is made helps crash victims read their own reports accurately.
The Injury Severity Scale
Most US states use a version of the KABCO injury scale, which was developed by the American Association of State Highway and Transportation Officials. The scale assigns a letter code to each person involved in a crash based on the officer’s observation of their apparent injury at the scene. Some states use numerical codes or modified versions, but the underlying classification logic is similar.
The five KABCO levels are:
K: Killed indicates that the person died as a result of the crash, either at the scene or within 30 days in most state definitions.
A: Incapacitating injury is what most people mean when they say “serious injury” in a crash report context. It refers to any injury other than a fatality that prevents the injured person from walking, driving, or continuing normal activities. Broken limbs, serious lacerations requiring surgery, moderate to severe head injuries, and spinal injuries typically fall in this category. A person who is transported by ambulance and admitted to a hospital is likely classified as A.
B: Non-incapacitating evident injury covers injuries that are visible but do not prevent the person from walking or otherwise functioning. This includes cuts, contusions, minor fractures, and soft tissue injuries that are apparent at the scene. A person who reports pain or has visible bruising but can stand and walk would typically be classified as B.
C: Possible injury applies when the injured person complains of pain or discomfort but no injury is visible and the person is not physically impaired. Whiplash that produces pain but no outward signs is a common C classification at the scene.
O: No apparent injury indicates that no injury was observed or reported at the scene.
Why the Classification Matters
The severity code the officer assigns affects the crash record in several ways. At the state data level, crash severity classifications determine how crashes are weighted in safety analyses, where engineering improvements are prioritized, and how crashes are reported in annual fatality and injury statistics.
At the individual claim level, the injury code in the police report influences initial insurance processing. An A-coded injury signals a serious crash that will receive more scrutiny, higher reserve amounts by the insurer, and likely faster response from claims personnel. A C-coded injury may be processed differently, and insurers may apply more skepticism to the evolution of that injury into a significant medical claim over time.
This is one of the reasons that seeking medical attention immediately after a crash matters so much. An injury that produces no visible signs at the scene but generates significant medical findings the following day arrives in the claim record without the initial A or B code that would have supported its seriousness from the start.
How Officers Make the Classification
Officers classify injuries based on what they observe at the scene and what injured parties tell them. They cannot diagnose injuries and are not expected to. A person with a severe concussion who is alert and ambulatory at the scene may be classified as C or even O if they do not report pain and show no visible injury, even if they develop serious symptoms the following day.
This is the most important limitation of the KABCO system for understanding your own report: the code reflects what was observable at the moment, not the actual medical outcome. A C-classification injury can ultimately be more serious than an A-classification one.
When there is a gap between the scene classification and your actual medical diagnosis, that gap is worth noting explicitly in communications with your insurer. Medical records documenting the injury and its connection to the crash are the primary evidence; the police report classification is a starting point, not a final determination.
What to Do If the Classification Seems Wrong
If the officer classified your injury lower than your medical diagnosis suggests, you can submit a supplemental statement to the reporting agency explaining the actual injury outcome with supporting medical documentation. This does not change the officer’s original record but attaches additional information to the file. For more background on what an accident report documents and how its various fields function, our guide covers the full structure of how police reports are organized and used.
KABCO Injury Scale at a Glance
| Code | Classification | Typical Examples |
| K | Killed | Death at scene or within 30 days |
| A | Incapacitating injury | Broken bones, serious head injury, spinal injury, ambulance transport |
| B | Non-incapacitating evident injury | Visible lacerations, minor fractures, visible contusions |
| C | Possible injury | Reported pain without visible injury; whiplash complaints |
| O | No apparent injury | No injury observed or reported at scene |
Getting Your Report to Understand the Classification
Reading the actual code on your report gives you the clearest picture of how the crash was classified officially. Once you have it, your medical records tell the complete story. For information on the injuries that most commonly arise after crashes and how they are treated, common injuries after car accidents provides the clinical picture.
FAQ: Injury Severity in Police Reports
Does an A classification guarantee a larger insurance settlement? Not automatically. The classification alerts the insurer to a serious crash, but settlement amounts depend on medical documentation, actual expenses, and the specific circumstances of the claim.
What if I was coded O but I developed serious injuries afterward? This happens regularly with soft tissue injuries and delayed-onset concussion. Your medical records documenting when symptoms appeared and connecting them to the crash are the foundation of your claim, regardless of the initial police report code.
Can the injury classification be changed after the report is filed? The original report code is rarely changed. You can submit a supplemental statement with medical documentation, but the O or C classification on the original report stays in the record.
Does the code affect whether my state requires the crash to be investigated further? Yes, in some states. Crashes with K and A classifications may trigger mandatory investigation reviews or additional reporting requirements that crashes coded O do not.
Is the classification the same in every state? Most states use KABCO or a close variant, but terminology and specific definitions vary. Some states use numerical codes instead of letters. The underlying concept of classifying injuries by apparent severity at the scene is consistent.
Do passengers get their own injury code? Yes. Each person involved in the crash, drivers and passengers alike, receives an individual injury severity code based on their apparent condition at the scene.
How Our Team Can Help You
If you’re trying to make sense of an injury classification on your own crash report, Local Accident Reports can help you track down the official record and understand what it shows. Contact our team or request a free report at (888) 657-1460, and we’ll help you locate the documentation you need.
Content reviewed by Hernán Beresnak, Lead Editor, Local Accident Reports. Last reviewed: August 2026.
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