What Do the Codes on an Accident Report Mean?

The numbers and letters on a car accident report are standardized codes that classify every important detail of the crash: how badly people were hurt, how the vehicles collided, what each driver was doing, what the weather and road looked like, and where on each car the damage landed. Most states build their accident report codes on a national template published by the National Highway Traffic Safety Administration, the Model Minimum Uniform Crash Criteria (MMUCC).1NHTSA. Model Minimum Uniform Crash Criteria The specific numbers your state uses may differ from a neighbor’s, but the categories and what they describe are nationally consistent.

Here is what each major group of codes on your report means, and why the entries matter when an insurance adjuster opens the file.

Why Codes Instead of Sentences

An officer at a scene can write a paragraph about the weather, or enter “07” in a single box. Codes are faster to record, impossible to misspell, and easy for computers to sort. Every report feeds state and federal traffic safety databases, and standardized codes let analysts compare thousands of crashes to find dangerous intersections and recurring causes. States can add their own fields and assign their own numbers, but the underlying categories trace back to the MMUCC guideline.1NHTSA. Model Minimum Uniform Crash Criteria

Injury Severity: The KABCO Scale

The most consequential code on any report is the injury classification, known as KABCO. Each letter marks a severity level, and the code assigned to you shapes how your claim is valued from day one.2Transportation.gov. MMUCC Guideline Model Minimum Uniform Crash Criteria Fourth Edition – Section: P5. Injury Status

  • K is a fatal injury, meaning death within 30 days of the crash. If someone dies after the initial report, the classification is updated retroactively.
  • A is a suspected serious injury: broken bones, deep lacerations exposing muscle or tissue, crush injuries, significant burns, unconsciousness at the scene, or paralysis.
  • B is a suspected minor injury that is visible but not life-threatening, such as bruises, abrasions, small cuts, or a bump on the head.
  • C is a possible injury. The person reports pain, limps, or briefly lost consciousness, but the officer sees no wound. This is the “my neck hurts” code.
  • O is no apparent injury, with no physical evidence and no reported symptoms.

The overall crash severity code on the report is pulled from the worst injury of anyone involved. A crash where one person is coded B and another K is classified as a fatal-injury crash.3Transportation.gov. MMUCC Guideline Model Minimum Uniform Crash Criteria Fourth Edition – Section: CD1. Crash Severity Adjusters and attorneys look at KABCO first because it sets the baseline for the entire claim. A C rating is hard to build a large injury claim around. An A rating tells the insurer they are dealing with something substantial.

Manner of Collision

These codes describe how two vehicles first made contact, regardless of what happened afterward. The MMUCC categories are:4Transportation.gov. MMUCC Guideline Model Minimum Uniform Crash Criteria Fourth Edition – Section: C9. Manner of Crash/Collision Impact

  • Front to rear, the classic rear-end collision. In most jurisdictions, the trailing driver gets the fault presumption.
  • Front to front, a head-on crash, typically a wrong-way driver or a vehicle crossing the center line.
  • Angle, where the vehicles approached from perpendicular or near-perpendicular directions, common at intersections.
  • Sideswipe, same direction, where two vehicles traveling the same way scrape sides, often during a lane change.
  • Sideswipe, opposite direction, where vehicles going opposite ways clip each other, usually on narrow roads.
  • Rear to side, where the back of one vehicle strikes the side of another.
  • Rear to rear, where both vehicles were backing up.

Your state’s form may use numbered codes such as 01 through 09 rather than spelling these out. The manner of collision code tells the story of the crash before anyone reads the narrative section.

First Harmful Event

Where manner of collision describes how two vehicles met, the first harmful event identifies the very first thing that caused damage or injury. That might be a vehicle collision, but it might also be a rollover, striking a tree, or hitting a pedestrian. The MMUCC form groups these into three bands:5NHTSA. MMUCC Crash Report Form – Section: C7. First Harmful Event

  • Non-collision events, codes 01 through 08, including rollovers, jackknifes, cargo shifts, fires, and vehicles going into water. Code 07 for a rollover is common in single-vehicle crashes.
  • Collision with a person, vehicle, or moving object, codes 09 through 20. A live animal is 09, a parked car is 15, a pedestrian is 17, a motor vehicle in traffic is 12.
  • Collision with a fixed object, codes 21 through 41. Trees are 40, utility poles 41, guardrails 32, ditches 28, embankments 29. A mailbox is code 34.

This field is especially important in single-vehicle crashes where no other driver is available to blame. A code showing the vehicle struck ice before hitting a guardrail paints a very different picture than a code showing the driver simply ran off the road.

Driver Action and Contributing Factors

Fault lives here. Officers select codes describing what each driver was doing and what factors contributed to the crash. Numbers vary by state, but common entries cover exceeding the speed limit, driving too fast for conditions, failing to yield, and making an improper lane change.6NHTSA. MMUCC Crash Report Form

Driver distraction has its own cluster. Cellphone use, whether calling, texting, or scrolling, usually has a dedicated code on modern forms. Other electronic devices, in-vehicle distractions, out-of-vehicle distractions, and general inattention each carry separate codes. Impairment codes cover alcohol, medication, fatigue, and medical conditions.

A detail that catches people off guard: a report can list contributing factors for both drivers. The officer might code Driver 1 with “failed to yield” and Driver 2 with “too fast for conditions.” Neither walks away clean, and the insurer will weigh both when splitting fault. When no contributing factor applies, the officer typically enters a “none” code rather than leaving the field blank.

Weather, Road, and Lighting

Environmental codes capture what the road and sky looked like. MMUCC weather codes include clear (03), cloudy (04), rain (07), snow (10), fog or smoke (05), sleet or hail (09), freezing rain (06), and severe crosswinds (08). Officers can select up to two weather conditions for a single crash.7NHTSA. MMUCC Crash Report Form – Section: C11. Weather Conditions

Road surface condition is a separate field. A wet road under clear weather is not the same as a wet road during a rainstorm, and the codes capture that distinction. Typical entries include dry, wet, icy, snowy, and slushy. Some state forms also note whether ice treatment was visibly applied.

Lighting codes distinguish daylight, dawn, dusk, dark with streetlights, and dark without streetlights. These matter because an insurer evaluating a crash on an unlit rural road at night will weigh it differently from the same collision at noon on a clear day.

Vehicle Damage Zones

Damage codes work like a clock face overlaid on the car. Rather than writing “the front-right corner was smashed,” the officer enters a number for a specific zone: center front, right front, right side, right rear, center rear, left rear, left side, left front, top and windows, and undercarriage. A “total” code indicates damage to essentially every area.

Most reports track the area of initial impact separately from the overall damaged area. Your car might have initial impact coded at the left front but damage extending across the entire left side. The gap between those two codes shows how the vehicle spun or what it struck next. Insurers use damage codes to cross-check repair estimates against the reported collision type.

Traffic Control and Location

These codes document what traffic controls existed at the crash site. Entries run from “no traffic control” through specific devices: stop signs, yield signs, traffic signals, marked lanes, no-passing lines, railroad crossings with various warnings, pedestrian crosswalks, and school or work zone speed reductions.

The traffic control code is pivotal for intersection crashes. If the report shows a traffic signal was present and a driver’s contributing factor is “failed to yield,” the implication is a run light or an ignored arrow. If the code shows “no traffic control,” both drivers may share more responsibility for navigating safely.

Location codes identify where the crash sat relative to intersections, driveways, and road types. A crash coded “at intersection” versus “intersection-related” versus “non-junction” carries different implications for right-of-way obligations.

How the Codes Shape Your Insurance Claim

These entries are not bureaucratic shorthand that gets filed and forgotten. They are the first thing an adjuster reviews, and they carry more weight than most people realize.

Driver action and contributing factor codes effectively assign preliminary fault. A police report is not a legal finding of liability, but insurers treat it as strong evidence. If your field says “no contributing factor” and the other driver’s says “failed to yield,” you have a powerful starting point. If both drivers have contributing codes, expect the insurer to argue shared fault, which in many states reduces recovery proportionally.

The KABCO code sets the tone for how your injury claim gets handled. An A code tends to get routed to a senior adjuster. A C code might not. The manner of collision code helps the insurer gauge whether reported injuries match the type of crash. A claimed back injury from a low-speed front-to-rear parking lot bump gets more scrutiny than the same injury from a high-speed angle collision at an intersection.

Environmental codes can shift blame off drivers entirely. If the road was icy and no treatment had been applied, a municipality or road maintenance contractor may share liability. If a traffic signal was malfunctioning, the agency responsible for maintaining it could be on the hook.

Finding the Code Definitions for Your State

Every state assigns its own numbers, so “code 34” on a report from one state will not match “code 34” from another. To decode yours:

  • Check the report itself. Many forms print a legend or code key on the back page or on an attached sheet. If you only received the front page, ask for the complete document.
  • Visit the issuing agency’s website. State highway patrols and departments of public safety typically publish crash report instruction manuals online with every definition. Search your state’s name plus “crash report code sheet” or “accident report manual.”
  • Use the MMUCC model as a starting point. If your state’s codes are not easily accessible, the NHTSA form provides the national template most states adapted. Category names and general meanings will be close, even where the specific numbers differ.6NHTSA. MMUCC Crash Report Form

Do not skip this step and guess. A contributing factor code you assume means “speeding” might actually mean “following too closely,” and the distinction matters for your claim.

What to Do About a Wrong Code

Officers complete reports based on what they see and hear at the scene, often under time pressure with incomplete information. Mistakes happen. A wrong contributing factor code or an inaccurate injury rating can undermine your claim or unfairly shift fault onto you.

Contact the agency that filed the report and ask to speak with the officer whose name is on the document. Most departments allow officers to file a supplemental narrative that corrects or clarifies specific facts. Bring evidence: photos, dashcam footage, witness contact information, or medical records that contradict the entry you want changed.

If the officer will not make the change, you can usually escalate to a supervisor or records custodian. Many agencies also let you submit your own written statement that gets attached to the report file. Even if the codes themselves do not change, your statement becomes part of the official record and can be referenced during an insurance dispute. Act quickly. The sooner you raise the issue, the more seriously it is taken.

A Note on Commercial Vehicle Crashes

If your crash involved a truck over 10,000 pounds, a bus seating nine or more, or any vehicle carrying placarded hazardous materials, the report will contain additional coded fields required by the Federal Motor Carrier Safety Administration.8FMCSA. SafetyNet Crash Data Requirements and Definitions Those codes include the carrier’s USDOT number, vehicle configuration (single-unit truck, tractor-trailer, bus size), cargo body type, gross vehicle weight category, and the driver’s commercial license class. If hazardous materials were involved, the report must include the four-digit material ID number and whether the material was released. Those carrier-identification codes let you or your attorney look up the trucking company’s federal safety record.