How to Read Your Crash Report: Injury Codes, Fault Factors & the Diagram (2026)

A police crash report records five layers — people, vehicles, conditions, events, and the officer’s opinions — mostly as numbered codes defined on your state’s published code sheet. The injury letters follow the national KABCO scale (K fatal, A serious, B minor, C possible, O/N none), and fault lives in the contributing-factor codes assigned to each driver. Both are officer estimates, and both can be wrong — research puts serious-injury coding accuracy at only about 33–50%.

Crash report decoding

Key Facts (verified July 2026)

Last updated 2026-07-27

The national standard: Most state forms descend from NHTSA's MMUCC guideline (first published 1998, updated through 2024) — so the anatomy is similar everywhere.
Injury codes: KABCO: K fatal, A suspected serious, B suspected minor, C possible, O/N no apparent injury — assigned at the scene by the officer, not a doctor.
Their error rate: Studies found "A" (serious) codes correct only ~33–50% of the time, and overall severity accuracy near 51%.
Where fault lives: Contributing-factor codes per driver (Texas lists ~75, e.g., 44 "Followed Too Closely", 61 "Speeding - Over Limit"), plus citations, narrative, and diagram.
The damage clock: Texas rates damage as XX-ABC-Y: direction of force on a 1–12 clock face, damage area, severity 0–7 — physical evidence that checks the story.
Your state's form: Texas: CR-3. California: CHP 555 (with a named "primary collision factor"). New York: the MV-104 series. Code sheets are public PDFs.
Fixing errors: Factual errors: amendment via the agency's records division. Opinion disputes: a supplemental statement. Vendors can't change reports.
Why it matters: Adjusters anchor fault and claim value on these codes — reading your report before any recorded statement is free leverage.

What's actually on a crash report? The five layers

Every state designs its own form, but nearly all descend from one federal blueprint: NHTSA’s Model Minimum Uniform Crash Criteria (MMUCC), a voluntary guideline first published in 1998 and revised five times since, most recently in 2024. That shared ancestry is why a Texas CR-3, a California CHP 555, and a New York MV-104A all record the same five layers, just in different boxes.

People: every driver, passenger, cyclist, and pedestrian, with seat position, restraint and airbag status, license class, and an injury code.
Vehicles: make, body style, plate, VIN, insurance (“financial responsibility”), defects, and a damage rating.
Conditions: weather, light, road surface, traffic controls, roadway type and alignment at the moment of the crash.
Events: the sequence of what struck what, in order — ran off road, jackknife, collision with vehicle, fixed object, and so on.
Opinions: the officer’s contributing-factor codes, narrative, diagram, and any citations — the layer insurers care about most, and the only layer that is judgment rather than observation.

Keeping the layers straight is the master key: facts (layers 1–4) get corrected by amendment when wrong; opinions (layer 5) get argued, supplemented, and outweighed — but rarely erased.

The injury letters: KABCO, and why yours may be wrong

Next to every person on the report sits one letter from the KABCO scale — the national convention for scene-side injury severity. It was designed for traffic statistics, not diagnosis, and it is assigned by an officer without medical training, usually without a hands-on examination, in the chaos of a crash scene.

Code	Label	What it means	What to know
K	Fatal Injury	Death at the scene or from crash injuries	Counted within 30 days of the crash under the national convention
A	Suspected Serious Injury	Incapacitating — victim typically cannot leave the scene unaided	Research: rated correctly only ~33–50% of the time
B	Suspected Minor Injury	Evident but not incapacitating injury	Frequently drifts between B and C across officers
C	Possible Injury	Injury claimed or suspected, not visible	Where late-onset whiplash and concussions usually land
O / N	No Apparent Injury	No injury observed or reported at the scene (Texas writes "N")	Does not bar a later injury claim — symptoms often surface in 24–72 hours

The accuracy problem is documented, not anecdotal. A University of Wisconsin–Madison study of officer-assigned KABCO codes found serious “A” injuries rated correctly for only 33% of victims and overall severity accuracy of 51%; a UNC road-safety center fact sheet likewise puts A-injury accuracy near 50%. In practice the misses run in one direction that matters to you: injuries that surface later — whiplash, concussions, soft tissue damage — get coded “C” or “no injury” at the scene.

So treat the letter as a data point, not a verdict. A “C” or “N” on your line does not cap your claim; your medical records do the defining. But expect the adjuster to open with the letter — and be ready to explain why it undersells what happened.

Where fault hides: the five signals insurers read first

No standard crash report has a box labeled “whose fault.” Fault is encoded across five places, and adjusters triangulate them within minutes of opening the file.

1. Contributing-factor codes. The loudest signal: the officer’s coded causes, assigned per driver. Texas’s current sheet offers roughly 75, from “Driver Inattention” (20) and “Failed to Control Speed” (22) to “Followed Too Closely” (44) and “Cell/Mobile Device Use - Texting” (75). Factors on the other unit and none on yours is the clean win; a factor on your unit is the thing to understand before anyone calls you.
2. Citations. A ticket issued at the scene turns an opinion into an enforcement action — far harder for the cited driver’s insurer to argue around.
3. The narrative. The officer’s prose account. Verbs matter: “Unit 2 failed to yield and struck Unit 1” reads very differently from “the vehicles collided.”
4. The diagram. Paths, point of impact, final positions. It either corroborates the narrative or quietly contradicts it.
5. The damage rating. Physics as a witness: Texas records direction of force on a 1–12 clock face. Force from 6 o’clock on your vehicle says “struck squarely from behind” no matter what anyone claims.

Some states are blunter than others: California’s CHP 555 names a “primary collision factor” outright. Wherever your state sits on that spectrum, the five signals are what the other side’s adjuster is reading while you’re still on hold.

Don't have your report yet?

You can’t read codes you don’t have. On a free call, we’ll pinpoint which agency holds your report and walk you through getting it at no cost — our national retrieval guide covers every channel if you’d rather DIY.

Find My Report — Free

Worked example: reading a Texas CR-3, field by field

Texas makes the best teaching example because TxDOT publishes the full CR-3 code sheet (Form CR-3CS, revised April 2023) as a public PDF. Here is the read order we use, with the field numbers from that sheet — other states differ in layout but not in substance. (For the form itself — all 46 code lists, versions, and the CR-100 officer manual — see our CR-3 reference guide.)

Field 16 — Injury Severity. Texas’s KABCO variant: A (suspected serious), B (suspected minor), C (possible), K (fatal), N (not injured). Check every occupant’s letter, not just your own.
Field 38 — Factors and Conditions. The fault codes, per unit. Skim for your unit number first, then the other driver’s. Codes 32–39 are the failed-to-yield family; 67/68 are alcohol and drug intoxication; 74–77 are the cell-phone family.
Field 39 — Vehicle Defects. Bald tires (12), defective brakes (10), and similar — a defect code can shift fault toward an owner or maintainer rather than a driver.
Field 29 — Vehicle Damage Rating. The XX-ABC-Y format: clock direction of force, damage-area code, severity 0–7 (with specials like VB-7, vehicle burned due to the collision).
Field 37 — Sequence of Events. Ordered event codes per unit: ran off road (1), collision with vehicle in transport (13), fixed object (18). The sequence often decides which of two stories is physically possible.
Fields 40–46 — Conditions. Weather, light, surface, traffic control. A “wet surface” or “signal light with red light running camera” entry can matter enormously later.
Fields 19–21 — Ejection, restraints, airbags. Insurers scan these for seat-belt defenses; make sure they’re right.

Texas drivers can pull the report itself for $6 through the CRIS portal — our Texas accident report guide covers the whole system, including the 10-day rule and the free path.

The diagram and narrative: the report's story layer

Codes compress; the diagram and narrative interpret. The diagram is the officer’s sketch of paths, impact point, and final rest positions against lanes and signals. The narrative is their prose reconstruction, usually a few sentences distilled from statements, physical evidence, and experience. Together they are the version of your crash that every later reader — adjuster, arbitrator, jury — absorbs first and remembers longest.

Read them like an editor. Does the diagram’s impact point match the damage rating’s direction of force? Does the narrative attribute movement (“Unit 2 crossed the centerline”) or dodge it (“the vehicles came together”)? Are witness statements summarized fairly — and were your own words captured the way you said them? Every mismatch is either your problem or your leverage; you want to know which before the insurer does.

And a warning that saves grief: the narrative is where late-arriving symptoms go to die. If you told the officer “I’m fine” while adrenalized, that quote will meet you again in the claim file — another reason the injury letter is a starting point, not the record.

The 15-minute review method

Read your report the day you get it, in this order. Fifteen focused minutes catches nearly everything that matters.

Get the official code sheet next to the report

Crash-report codes are meaningless without the legend. Search "[your state] crash report code sheet" on the state DOT site — Texas publishes the CR-3 code sheet as a free PDF — and keep it open while you read.

Verify the identity layer first

Names, addresses, driver's license numbers, plates, VINs, and insurance policy numbers for every party. These cause the most claim-processing failures and are the easiest errors to get corrected.

Decode the injury code for every person

Find the KABCO letter (Texas: field 16) next to each occupant. If you were coded C or "not injured" but symptoms emerged later, flag it — scene-side codes are estimates, and your medical records, not the letter, establish your injuries.

Read the contributing factors for each driver

This is the fault layer (Texas: fields 38-39). Note every code assigned to each unit and look each up on the code sheet. A factor on the other driver and none on you is leverage; a factor on you is something to understand before an adjuster raises it.

Cross-check the diagram, narrative, and damage rating

The three should tell one consistent story: paths and impact point (diagram), the officer's prose account (narrative), and the direction-of-force code (Texas field 29's clock format). Inconsistencies cut both ways — find them before the insurer does.

List errors and act on them the same week

Factual errors go to the agency's records division for amendment; opinion disputes become a supplemental statement; injury-code understatements go to your file with medical records attached. Every correction is easier while the crash is recent.

Fixing errors: amendments, supplements, and what won't change

Corrections split cleanly along the fact/opinion line. Factual errors — a transposed plate, the wrong insurance policy, a misspelled name, a passenger left off entirely — are routine amendments: contact the responding agency’s records division, provide documentation, and the officer or agency files the correction. Do it early; records staff amend last week’s report far more readily than last year’s.

Opinions are stickier. Most agencies will not re-code a contributing factor or rewrite a narrative because a driver disagrees; the standard remedy is a supplemental statement — your version, attached to the file so every later reader sees both. If the stakes are high (an injury claim, a citation you’re contesting), that supplement is worth writing carefully, and often with counsel.

One boundary to remember from our vendor guides: platforms that sell reports — BuyCrash, CrashDocs — distribute copies; they cannot change a word. Corrections flow only through the agency that wrote the report.

If you were injured, the codes are the negotiation

Put the pieces of this page together and the stakes get concrete: your injury letter was assigned in seconds by a non-doctor and is wrong up to half the time; fault was encoded in factor codes you’ve maybe never looked up; and the adjuster on the other side reads all of it fluently before your first phone call. With 6.14 million police-reported crashes a year, this asymmetry is the norm, not the exception — and it is fixable in an afternoon.

Get a professional read

These codes decide who pays. On a free call, we’ll locate your report, walk you through getting it at no cost, and a licensed attorney will explain what its codes mean for your specific claim — no cost, no obligation. Want a rough number first? Try the free settlement calculator at SetCalc.

Get a Free Attorney Read of My Report

Reading Your Crash Report: Frequently Asked Questions

What do the codes on my accident report mean?

Each numbered field on a crash report maps to a published code list: injury severity (the KABCO letters), contributing factors (the officer's fault opinion), vehicle damage, sequence of events, and scene conditions like weather and light. Every state publishes a code sheet — Texas's CR-3 code sheet, for example, defines all of them field by field, and this guide walks through the ones that matter.

What does injury code C (or B, or A) mean on a crash report?

Those are KABCO severity codes: K means fatal, A a suspected serious (incapacitating) injury, B a suspected minor injury, C a possible injury, and O or N no apparent injury. They are the officer's scene-side estimate, not a diagnosis — which is why a "C" on your report does not cap what your injuries actually are.

How accurate are the injury codes police assign?

Imperfect, by the research: officers assign KABCO codes without medical training, and studies found serious "A" injuries are rated correctly only about a third to half of the time, with overall severity accuracy near 51%. Injuries like whiplash and concussions that surface hours later are routinely coded "C" or "no injury" at the scene.

Does the crash report say whose fault the accident was?

Not in one labeled box — fault is encoded. The contributing-factor codes assigned to each driver are the clearest signal (Texas code 44 is "Followed Too Closely," 61 is "Speeding - Over Limit"), reinforced by any citation issued, the narrative's wording, the diagram, and the damage direction. California's CHP 555 goes furthest, naming a "primary collision factor."

What is a contributing factor on a crash report?

The officer's coded opinion of what caused or contributed to the crash, assigned per driver. Texas's current code sheet lists roughly 75 options — from "Driver Inattention" (20) and "Failed to Control Speed" (22) to "Cell/Mobile Device Use - Texting" (75). A factor code next to the other driver's unit and none next to yours is the strongest fault signal a report carries.

What is the KABCO scale?

The national injury-classification convention police use on crash reports: K (killed), A (suspected serious injury), B (suspected minor injury), C (possible injury), O (no apparent injury — Texas writes it as N, "Not Injured"). It descends from NHTSA's MMUCC guideline, the voluntary federal standard most state crash-report forms are built on.

What does the damage rating like "12-FD-3" mean?

That's Texas's vehicle damage format: clock direction of force, damage-area code, then severity 0–7. "12-FD-3" reads as force from the 12 o'clock position, front-distributed damage, severity 3. The direction number quietly corroborates or contradicts the story — a rear-end defendant claiming you cut them off has a problem if your car's rating starts with 6 (struck squarely from behind).

What is the diagram on the crash report for?

It is the officer's scaled sketch of the crash: vehicle paths, point of impact, final rest positions, lanes, and signals. Adjusters read it as shorthand for the whole event, so check that arrows, lane positions, and the impact point match what happened — a diagram error skews every fault conclusion drawn from it.

The officer got something wrong on my report. Can I fix it?

Factual errors — wrong plate, insurance policy, spelling, a missing passenger — are routinely corrected: contact the responding agency's records division and ask for its amendment or supplement process. The officer's opinions (factor codes, narrative conclusions) are much harder to change; the usual remedy is adding your own supplemental statement to the file.

Will the insurance company use these codes against me?

Yes — the report is the first document an adjuster reads, and its factor codes, citation entries, and diagram anchor the initial fault assignment. A code implying you contributed (even mildly, like "Driver Inattention") shows up in their liability math. That is exactly why reading your own report before any recorded statement matters.

Is the officer's fault opinion final?

No. Contributing factors and narrative conclusions are opinions, not adjudications — insurers weigh them heavily but can be argued past with physical evidence, witnesses, and video, and courts are not bound by them. Meanwhile the report's raw facts (positions, damage direction, statements) often argue louder than its coded opinions.

What form is my state's crash report?

Each state designs its own MMUCC-influenced form: Texas uses the CR-3 Peace Officer's Crash Report, California the CHP 555 Traffic Collision Report (used by many local agencies too), and New York the MV-104 series (MV-104A for police reports). The layouts differ; the anatomy — people, vehicles, conditions, events, opinions — is the same everywhere.

Codes still not adding up?

These codes decide who pays. If you were injured, get a free attorney read of your report on one call — located, decoded, and explained for your case.