The Workers’ Compensation Research Institute (WCRI) published Impact of Networks on Claim Outcomes in April 2026, analyzing lost-time claims with experience through March 2024 across 34 states. The headline finding: in-network claims cost $11,820 less than out-of-network claims at 36 months of maturity, a 26% reduction in total claim costs. The savings are not concentrated in one bucket. They show up in medical payments, indemnity benefits, litigation expenses, and disability duration.
For self-insured employers approaching mid-year actuarial reviews, the study puts a number on what many risk managers have assumed but few have quantified at the program level: network participation is a controllable severity lever, and the gap between high- and low-penetration programs is wide enough to move the triangle.
Who It Affects
Self-insured employers operating workers’ comp programs in any of the 34 states WCRI studied, particularly those in states with low network penetration. Employers in Louisiana and Minnesota, where only 43% of WC medical payments flow through networks, face the largest severity gap relative to employers in states like New Jersey, where penetration reaches 90%. Multi-state self-insureds with inconsistent network mandates across jurisdictions carry a blended severity assumption that may not reflect the actual state-by-state split.
Where the Savings Land
WCRI’s matched-claim methodology isolates network effects by comparing similar claims treated in-network versus out-of-network. The reductions cut across every cost component:
- Medical payments fall 27% (roughly $3,500 per claim at 12 months), with urban claims saving 28% and rural claims saving 20%.
- Indemnity benefits decline 23%, driven largely by a 9% reduction in disability duration: 15.8 weeks for in-network claims versus 17.4 weeks for out-of-network at 36 months.
- Benefit delivery expenses, which include medical cost containment and legal costs, drop 29%.
- Litigation is 12% less likely in network claims, and when it does occur, costs average 39% less.
Faster access to care is a key mechanism. In-network injured workers see a provider nearly three days sooner, and initial physical medicine services begin 13 days earlier. That acceleration compresses early development and feeds through to shorter disability periods.
The Reserve Mechanism
Network participation affects severity assumptions at every evaluation point. When 76% of WC medical payments nationally now flow through networks (up from 56% two decades ago), most industry benchmarks already reflect substantial network effects. The problem for self-insured employers is that benchmark data blends high- and low-penetration programs. An employer running at 50% network penetration is benchmarking against an industry average that assumes 76%.
The 9% reduction in disability duration is particularly significant for development factor selection. Shorter disability periods mean claims close faster, which compresses the paid loss development pattern and reduces tail factors. If your actuary’s development factors are calibrated to an industry mix that includes more network utilization than your program delivers, the factors will understate your program’s actual development.
The state-level variation in WC surgery costs that WCRI documented earlier this year compounds the effect: employers in states with both low network penetration and high fee schedules carry a double severity load that generic benchmarks will miss.
From reviewing hundreds of self-insured WC programs across multiple states, the gap between employers who mandate network usage and those who allow unrestricted provider choice typically shows up as a 15-to-25% severity differential in the development triangle within three accident years.
What This Means for Your Next Review
If your program’s network penetration rate is below the 76% national average, your severity assumptions may be understated relative to the benchmarks your actuary is using. Ask whether the selected medical and indemnity severity factors reflect your actual in-network utilization rate, or whether they are based on industry data that blends network and non-network claims. For employers considering network mandates or tighter provider steering, the WCRI data provides a defensible basis for adjusting expected loss ratios downward on a prospective basis.
Ask your actuary:
- Are your selected severity factors for WC medical and indemnity reflecting our current in-network utilization rate, or are they based on blended industry data?
- How would increasing our network penetration rate toward the 90% benchmark affect the projected ultimate loss for open accident years?
- Is the 9% disability duration reduction reflected in your development factor selection, or are you still using tail factors that assume longer claim resolution periods?
Sources
- WCRI, “Impact of Networks on Claim Outcomes” (April 2026)
- Risk & Insurance, “Workers’ Comp Provider Networks Cut Total Claim Costs by 26%” (May 2026)
- Business Insurance, “Medical Provider Networks Tied to Lower Comp Costs, Faster Care” (April 2026)
- WorkCompWire, “WCRI Report: In-Network Care Lowers Costs, Speeds Treatment, and Shortens Disability” (April 2026)