In a traditional at-fault system, the driver who caused the accident — through their liability insurer — pays for the injuries. In a no-fault system, your own policy pays your medical costs first, regardless of who was responsible.
The trade is deliberate: faster payment of medical bills, in exchange for limits on when you may sue the other driver.
What PIP covers
Personal injury protection is the coverage that does this work. What it includes varies substantially by state, but the categories are typically:
- Medical expenses from the accident.
- Lost income, usually a percentage up to a cap.
- Replacement services — paying someone to do things you cannot do while injured, such as childcare or household tasks.
- Funeral expenses, in most states that require it.
PIP generally covers you, household family members, and passengers, and often applies whether you were driving, a passenger in another vehicle, or a pedestrian.
PIP pays regardless of fault. That includes accidents you caused. This is the feature that distinguishes it from liability coverage and from the medical payments coverage available in at-fault states.
The limitation on suing
This is the other half of the bargain, and it is where states differ most.
No-fault states restrict when an injured person may bring a claim against the at-fault driver for pain and suffering. The restriction is expressed as a threshold, and there are two kinds.
Monetary threshold You may sue once medical expenses exceed a stated dollar figure.
Verbal threshold You may sue only if the injury meets a described standard — typically serious impairment, permanent injury, significant disfigurement, or death.
Verbal thresholds are generally harder to meet, and what qualifies is a question that has been litigated extensively in the states that use them.
Choice no-fault
A few states let drivers choose between systems at purchase. Selecting the limited-tort or no-fault option usually lowers the premium and accepts the threshold; selecting full tort preserves the unrestricted right to sue at a higher premium.
This choice is made on the application and is easy to make without realising what it does. If you live in a state offering it, your declarations page or application will record which you selected.
Coordination with health insurance
Several no-fault states let you coordinate PIP with your health coverage, designating one as primary. Choosing health insurance as primary typically reduces the PIP premium.
The catch is worth understanding: if you later lose the health coverage, change to a plan with a high deductible, or the plan denies the treatment, the arrangement you priced for no longer holds. Coordination decisions are worth revisiting whenever health coverage changes.
PIP is not the same as medical payments
Both pay medical costs regardless of fault, and they are frequently confused.
MedPay is generally a smaller amount, covers medical expenses only, and is optional in most at-fault states. PIP is broader — it typically includes lost wages and replacement services — and is mandatory in no-fault states.
Deadlines that are shorter than you expect
PIP claims frequently carry short filing windows set by state law, sometimes measured in days rather than months from the date of the accident. Some states also require treatment to begin within a stated period for expenses to be payable.
These deadlines are separate from your policy's notice requirement and separate again from any statute of limitations. In a no-fault state they are among the first things to confirm after an accident.
What we are not saying
We are not telling you which tort option to choose where a choice exists, or how to coordinate PIP with health coverage. Those depend on your health plan, your income, and your circumstances.
What we are saying is that PIP pays regardless of fault, that the corresponding limitation on suing varies enormously between states, and that PIP filing deadlines are frequently much shorter than people assume.
Where to verify this yourself
- Your state Department of Insurance — whether your state is no-fault, the threshold that applies, and PIP filing deadlines.
- Your declarations page — your PIP limits, any coordination election, and any tort option selected.
- Your health plan — how it coordinates with auto medical coverage.
This is general education, not advice. Insurance law and claim rules vary by state and change over time. Nothing here is legal, financial, or insurance advice for your situation, and reading it does not create any professional relationship. For your specific case, consult a licensed professional in your state or contact your state Department of Insurance.