California’s workers’ comp rates are rising. Blame late insight.

Michael Paczolt, FCAS, MAAA

Principal & Product Manager, Nodal

May 15, 2026

Two consecutive years of substantial rate increases reflect a breakdown in how and when risk is recognized.

Key takeaways:

• California rates are rising sharply for the second consecutive year, and the underlying drivers are not going away.
• More claims that initially appear routine are progressing into high-cost, high-complexity trajectories before anyone sees them coming.
• Early risk signals are not reliably identifiable through manual review alone. And even flagged claims go unmanaged when adjusters lack visibility.
• The organizations that will outperform find the right claims early and give adjusters a clear path to act.

Rate increases point to something deeper than inflation

The Workers’ Compensation Insurance Rating Bureau (WCIRB) has proposed a 10.4% pure premium rate increase in California, the second consecutive year of requests above 10%. Last year’s 11.2% request was approved at 8.7%.

It’s tempting to dismiss these increases, however large, as the predictable result of medical inflation, litigation trends, legislative shifts, and other external forces that have driven up costs over the past few years. It’s also tempting to assume that once these macro forces settle down, premium rates will follow, returning to the decade-long decline that defined the market before 2025.

But that may be wishful thinking.

The WCIRB’s own filing points to two instructive trends that are harder to explain away. Cumulative trauma claims have surged from 17.8% to 26.4% of all indemnity claims over the past three years, and medical costs per indemnity claim rose an estimated 9% in 2024, faster than inflation alone can explain.

More claims are becoming high cost before anyone sees them coming

Both data points reflect something claims leaders across the industry are experiencing: more claims that initially appeared low-severity are progressing into high-cost, high-complexity trajectories.

The instinct is to frame this as a capacity problem. Recent industry reports have highlighted the strain claims professionals are under, with 56% of them now reporting too many claims to manage effectively, up from 40% just a year ago.

But that’s only part of the story.

The problem isn’t capacity. High-cost claims are invisible until it’s too late.

The composition of claims portfolios has shifted. Cumulative trauma claims, which develop gradually, across months or years, with no single moment of obvious severity, now represent more than one in four indemnity claims in California, up from less than one in five just three years ago. Their early signals are hard to detect by nature. Evolving pain descriptions, shifting functional limitations, patterns distributed across adjuster notes and medical narratives alone do not individually trigger concern.

Even the most experienced adjuster, with a dream-like workload and no competing priorities, cannot consistently identify which of today’s routine claims will become tomorrow’s six-figure losses. Spotting them requires synthesizing hundreds of variables across an entire portfolio simultaneously.

Capacity does come into play, but the impact is felt after a claim is flagged. The adjuster still has to act. A flagged claim sitting in a crowded diary, behind more obviously urgent files, follows the same trajectory as one that was never flagged at all.

The cost of each missed signal is larger than it has ever been

Medical costs compound the problem. Between 2017 and 2023, average medical costs per indemnity claim grew at 3.7% annually. Between 2023 and 2024, that rate more than doubled to 7.7%. In California, the acceleration has been even sharper.

Inflation contributes, but it does not explain the shift. In many organizations there is still no real-time, risk-adjusted benchmark for what treatment should reasonably cost for a given injury profile. Without that benchmark, variation in care and provider behavior becomes visible only after spend accumulates.

Why the market is pricing this in now

Without early identification and a clear path to act, high-cost claims move through undetected and unmanaged. For years, the dollar value of each missed signal was manageable. That calculus has changed. Spend is accelerating, cumulative trauma claims are surging, and every claim that crosses into high-cost territory undetected now carries a much larger price tag. The rate increases the WCIRB is now proposing are not simply a function of inflation or litigation. They reflect the compounding cost of a visibility problem the industry can no longer absorb.

You can’t change the rate. You can change your loss ratio.

As rising rates put pressure on profitability, claims professionals should not be asking whether or not the market will normalize to pre-2025 levels. They should be asking what levers they can pull in the very likely case it doesn’t.

The organizations best positioned to weather sustained rate pressure are solving both problems in sequence. First, identifying high-risk claims before attorney involvement and treatment patterns are set . Then ensuring adjusters have a clear path to act on what the model finds, and benchmarking medical spend against a risk-adjusted expectation while the claim is still open.

None of those capabilities change the market rate. Together, they change what a book of business costs to manage. At scale, that’s the difference between feeling every basis point of a rate increase and having the margin to absorb it.