When most people think of New York’s serious injury threshold, they think of broken bones, permanent disabilities, or catastrophic injuries. But the ninth category under Insurance Law §5102(d) — commonly called the “90/180 day rule” — was specifically written for injuries that are not permanent but were severe enough to substantially disrupt your life for an extended period.

For accident victims who do not have fractures, who may not have permanent limitations, but who genuinely could not work, care for their families, or carry out their normal routines for months after a crash, the 90/180 day rule can be the path that unlocks their right to full compensation. At Siddons Law Firm, we have seen this category make the difference in cases that might otherwise be stuck within the no-fault system.

How the 90/180 Day Rule Works

The statute requires proof of a “medically determined injury or impairment of a non-permanent nature which prevents the injured person from performing substantially all of the material acts which constitute such person’s usual and customary daily activities for not less than ninety days during the one hundred eighty days immediately following the occurrence.”

Breaking this down into its essential elements, the injury must be medically determined, meaning diagnosed and documented by a physician based on objective medical evidence rather than solely on your subjective complaints. The injury does not need to be permanent — in fact, this category is specifically designed for non-permanent injuries. You must have been prevented from performing “substantially all” of your usual daily activities, which courts have interpreted strictly. And the 90-day limitation period must fall within the first 180 days (approximately six months) after the accident.

What “Substantially All” Daily Activities Means

This is where many 90/180 day claims fail. New York courts have interpreted “substantially all of the material acts” very strictly. The standard is not that you had difficulty with some activities, or that certain tasks were painful, or that you had to modify how you did things. The standard is that you were prevented from performing substantially all of your usual and customary activities.

Courts have found the standard met when plaintiffs were confined to bed or home for extended periods, unable to work at their jobs for the required period, unable to perform household chores, childcare, and personal care activities, and unable to engage in recreational and social activities that were part of their regular routine.

Conversely, courts have rejected 90/180 day claims where plaintiffs returned to work — even light duty — within the 180-day period, could still perform most household tasks with some difficulty, missed only sporadic days of activity rather than a continuous or near-continuous period, or had daily activity limitations that were partial rather than near-total.

The key distinction is between being impaired and being prevented. Some limitation in your activities is not enough. The injury must have substantially curtailed nearly everything you normally do.

The 90-Day Counting Period

The 90 days do not need to be consecutive. You need at least 90 days of substantial limitation within the first 180 days after the accident. However, courts look at the overall pattern. If your medical records show you were significantly limited for the first two months, then returned to most activities, then claimed limitation again near the end of the 180-day window, the evidence may not be persuasive.

The most compelling cases show a consistent pattern of limitation that gradually improves over the 180-day period, supported by regular medical visits documenting your functional status throughout.

Evidence Required to Prove a 90/180 Day Claim

Successfully proving a 90/180 day claim requires both medical evidence and personal documentation:

Medical records. Your physician must diagnose the injury, prescribe treatment, and document at regular intervals how the injury is limiting your function. Records should specifically note what activities you cannot perform and why. Vague notes like “patient should rest” are far less effective than specific notes like “patient cannot lift more than five pounds, cannot sit for more than 20 minutes, cannot perform household cleaning or child-lifting activities.”

Work records. If you missed work, obtain documentation from your employer confirming the dates of absence. If you were placed on restricted duty, get documentation of the specific restrictions. If you are self-employed, tax records, client communications, and business records showing reduced activity can serve the same purpose.

Disability documentation. If you applied for short-term disability benefits, those records — including the physician’s certification of disability — provide powerful corroborating evidence.

Personal journal or activity log. While not strictly required, a contemporaneous record of what you could and could not do each day during the 180-day period can support your testimony and help your attorney present a clear picture of the impact to a jury or judge.

Testimony from family, friends, or coworkers. People who observed your limitations firsthand can provide testimony about how your daily life changed after the accident. A spouse who took over all household responsibilities, a coworker who observed your absence, or a friend who noticed you could no longer participate in regular activities can all strengthen the claim.

Common Reasons 90/180 Day Claims Are Denied

The most frequent reason courts reject 90/180 day claims is that the plaintiff returned to work or resumed significant daily activities within the 180-day window. Even returning to work on a part-time or light-duty basis can be used against you, because the defense will argue that performing work duties — even modified ones — means you were not prevented from “substantially all” of your usual activities.

Other common reasons for denial include gaps in medical treatment during the 180-day period that suggest the injuries were not continuously limiting, medical records that document pain and treatment but do not specifically document functional limitations on daily activities, a failure to quantify the limitation period with specific dates and documented restrictions, and testimony at deposition that contradicts the claimed level of limitation — for example, admitting to driving, shopping, or attending social events during the period when you claim to have been unable to perform substantially all daily activities.

Strategic Considerations for Your Case

The 90/180 day rule is often pursued as an alternative or additional category alongside “significant limitation of use” (category 8) or “permanent consequential limitation” (category 7). An experienced attorney will evaluate your case under all potentially applicable categories rather than relying on a single one.

If your injuries show signs of permanence, categories 7 or 8 may be stronger paths because they do not require the strict “substantially all activities” standard. If your injuries are clearly non-permanent but were severely debilitating in the months after the accident, the 90/180 day rule may be your best option. In many cases, pursuing multiple categories provides the strongest position.

Frequently Asked Questions

Can I qualify under the 90/180 day rule if I went back to work?

It depends on the circumstances. Returning to full, unrestricted work within the 180-day period significantly weakens a 90/180 day claim because courts may find that performing job duties means you were not prevented from “substantially all” usual activities. However, if you returned to work in a severely limited capacity, with documented restrictions, while still unable to perform most other daily activities, the claim may still be viable. Each case is evaluated on its specific facts.

Do the 90 days have to be consecutive?

No. The statute requires at least 90 days of limitation within the 180-day window, but those days do not need to be consecutive. However, courts are more persuaded by a continuous or near-continuous period of limitation than by scattered days adding up to 90. A pattern of sustained limitation that gradually improves is the strongest evidence.

What if my injuries lasted beyond 180 days but I was not fully disabled during that period?

If your injuries continued beyond 180 days, you may have stronger claims under the “significant limitation” (category 8) or “permanent consequential limitation” (category 7) categories, which do not have the strict “substantially all activities” requirement. The 90/180 day rule is one of nine categories, and your attorney should evaluate all applicable categories rather than limiting your case to just one.

What counts as “usual and customary daily activities”?

Courts look at what you actually did before the accident — your specific routine, not a generic standard. This includes your job duties, household responsibilities like cooking, cleaning, and childcare, exercise and recreational activities, social activities, and personal care tasks. The more specifically you can document what your pre-accident routine looked like and how the injury changed it, the stronger your claim.