The Workers Compensation Research Institute released its CompScope Benchmarks for California, 2026 edition in mid-May, and the headline number (6% total cost growth per claim) understates the structural shift underneath. Benefit delivery expenses (BDE), the category covering litigation, medical management, and administrative costs, jumped 9% per claim in 2025. That is the fastest-growing cost component in California workers’ compensation, outpacing medical payments at 7% and indemnity benefits at 4%.
The BDE acceleration is not new. The category grew 5% to 8% annually from 2022 through 2024, extending a trend that began after pandemic-era decreases. But 2025 marks the first time in over a decade that friction costs are growing faster than the medical and indemnity payments they exist to manage.
What is driving the friction
Defense attorney involvement in California claims increased 5 percentage points cumulatively from 2022 to 2025. The share of claims with medical-legal payments rose 2 points over the same period. California already carries the highest medical cost containment expenses among WCRI’s 18 study states, at 25% of total medical payments. That ratio is now climbing.
Meanwhile, the medical cost stability that held from roughly 2010 through 2022 is over. Medical payments per claim grew 7% in 2025, driven by price increases for hospital, ambulatory surgery center, and evaluation and management services, not by changes in utilization. Indemnity grew a more modest 4%, partly reflecting California’s statewide minimum wage increase to $16.50 per hour in January 2025, with sector-specific floors of $20 for fast food workers and $18 to $25 for healthcare facility workers.
Who it affects
Self-insured employers in California, public entity pools, and single-parent captives writing California workers’ comp. The state’s total costs per claim run 26% above the 18-state median, a gap concentrated in BDE and temporary disability duration rather than in medical payments, which sit 31% below median. For programs that set loss adjustment expense reserves as a fixed ratio to losses, the divergence between 9% BDE growth and 4% to 7% loss growth means that ratio is drifting higher every evaluation period.
Reserve mechanism
The core issue is allocated loss adjustment expense (ALAE) development. Many self-insured programs apply a historical LAE-to-loss ratio, often derived from several years of data, to project ultimate expenses. When BDE growth outpaces loss growth by 2 to 5 percentage points per year over three consecutive years, that fixed ratio understates current-period LAE by a compounding margin. Programs that last calibrated their ratio before 2022 are most exposed.
Separately, the break in medical cost stability changes the denominator. If medical severity assumptions still reflect the flat trend that held for a decade, both the loss reserve and the LAE reserve built on top of it may be understated. CWCI’s parallel data showing 13% medical cost growth for California public self-insureds confirms the acceleration is not limited to the insured market.
What this means for your next review
Ask your actuary whether LAE development in your California WC program is tracked on its own triangle or simply loaded as a percentage of losses. If the latter, request a comparison of the BDE-to-loss ratio from your most recent three evaluations against the ratio embedded in the reserve. The WCRI’s national CompScope data showing 6% annual growth across all components provides the system-wide benchmark; your program-level ratio is what matters for the accrual.
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