The Five-Year Rule: Reopening a California Workers’ Comp Case

California’s reopening clock, plainly: §5410 new-and-further claims within five years of the injury, the board’s §§5803–5804 power to change an award on a petition filed inside the same window, why a C&R closes the door while Stips leave it open — and what a reopened rating is worth in dollars.

Comp cases don’t always stay closed. For five years after the date of injury, California keeps two doors open: the worker’s right to claim new and further disability (§5410), and the board’s power to change its own award on a timely petition (§§5803–5804; statutory text per leginfo, checked July 2026). Which door is still open — and whether either was signed away — decides real money.

New and further disability (§5410)

Within five years of the date of injury, an injured worker may institute proceedings on the ground that the original injury has caused new and further disability — the condition worsened, surgery arrived, temporary disability resumed, or the permanent disability grew past the prior rating. The board’s jurisdiction is continuing within that window, and filing inside it preserves the claim even while the medicine develops. One boundary the section states itself: it does not extend the separate limitations period for serious-and-willful claims (§5407).

The award side (§§5803–5804)

The board holds continuing jurisdiction over its orders and awards and may, for good cause, “grant or regrant, diminish, increase, or terminate” compensation where the disability has recurred, increased, diminished, or terminated. The hard stop is §5804: no award may be rescinded, altered, or amended after five years from the injury unless a petition was filed within those five years — and once one side petitions, the other has 30 days to counterpetition for its own relief. Note the symmetry: the reopening clock serves carriers too.

C&R closes the door; Stips leave it open

This is the five-year rule’s real-world cash value. A compromise and release buys out the reopening right — that risk transfer is part of what the lump sum pays for. Stipulations with request for award leave §5410 and §5803 alive for the full five years. A worker whose condition is still evolving gives up more than they think when they C&R early; a carrier closing a deteriorating file buys more than it looks like. The case-timeline guide shows where each settlement type lands in the arc.

What a reopening is worth

The petition’s value is a rating delta. A case awarded at 24% — $27,695 at the 2026 maximum, age 37–41 — that now supports 36% ($50,170) is, before offsets for sums already paid, a $22,475 petition. Rate the worsened condition in the calculator, compare strings against the old award, and the number the fight is about is on the screen. The five-year habit now pays twice, incidentally: the SIBTF’s new filing deadline also runs five years from the subsequent injury (or six months from PD resolution, whichever is later). Calendar both from the deadline calculator.

Estimates for informational use; dollar figures assume the stated year, age band, and maximum weekly rate; not legal advice.

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FAQ

What is the 5-year rule in California workers’ comp?

Two related clocks, both running from the date of injury. Under §5410, an injured worker may claim compensation within five years of the injury on the ground the original injury caused new and further disability. Under §§5803–5804, the appeals board keeps continuing jurisdiction over its awards, but no award may be rescinded, altered, or amended after five years from the injury unless a petition was filed within those five years.

What counts as “new and further disability”?

The original injury getting worse in a way that generates new benefits: the condition deteriorates, surgery becomes necessary, a new period of temporary disability begins, or the permanent disability increases beyond the prior rating. It is the same injury compounding — a brand-new injury gets its own claim, not a reopening.

Can I reopen my case after a C&R?

Generally no. A compromise and release is a buyout — the negotiated lump sum purchases, among other things, the right to come back. That is a core part of what the carrier is paying for. Stipulations with request for award are the opposite: they leave the five-year reopening rights alive, which is exactly why the C&R-versus-Stips choice matters more than most settlers realize.

How do I petition to reopen a workers’ comp case?

By petition to the WCAB — filed in the existing case, within five years of the date of injury, stating the good cause (typically new and further disability supported by medical evidence). Practically: get current medical reporting first, file the petition inside the window even if the medicine is still developing, and expect the rating dispute to run through the same med-legal machinery as the original case.

Can the insurance company petition to reopen too?

Yes. The board’s §5803 power runs both ways — it may “grant or regrant, diminish, increase, or terminate” compensation where the disability has recurred, increased, diminished, or terminated. A carrier can petition to reduce an award on the same five-year clock, and §5804 gives the adverse party 30 days to counterpetition for its own relief once a petition is filed.