On July 1, 2026, Segal reported that medical stop-loss premiums rose an average of 12.7% for the 225 health plans in its 2026 national dataset that held their specific stop-loss deductibles flat, up from 9.7% the prior year (Segal, Medical Stop-Loss Premiums Increase Nearly 13%). Across all groups, including those that raised deductibles to blunt the renewal, the average was 11.5%, up from 7.3%. Segal attributes the acceleration to high-cost claims: the number of claimants with seven-figure claims has grown about 25% a year over the last four years.
That renewal number is not the same as your medical trend, and the gap is the story.
Who it affects
Self-funded employers, especially in the 200 to 2,000 employee band that carries direct claims risk with specific deductibles often in the $200,000 to $350,000 range, plus group medical stop-loss captives and the fronting carriers behind them. These are the plans that feel a bad claim year immediately and frequently lack in-house actuarial staff to model why the stop-loss line outruns the plan’s own trend.
The reserve mechanism
The lever is leveraged trend on the specific attachment point. Your specific deductible is a fixed dollar figure. Gross claims inflate at medical trend, but the piece the stop-loss layer reimburses is only the amount above that fixed deductible, so it grows disproportionately. Consider a plan with a $250,000 specific deductible. A claim that reached $300,000 last year sits $50,000 into the reimbursed layer. Let that same claim inflate 10% to $330,000, and the reimbursed piece jumps from $50,000 to $80,000, a 60% increase off a 10% gross move. Stack rising frequency on top, more claimants crossing the deductible each year, and the specific stop-loss layer trends well above the roughly 9% overall medical trend employers are budgeting. Voya Financial’s stop-loss claims analysis puts large-claim incidence at 32.5 per unit of exposure, up from 23.8, a 37% frequency rise that compounds the leverage.
Where this shows up in your reserves
On the stop-loss reconciliation, in the specific reimbursement layer, not in the plan’s gross paid trend. A plan that trended its aggregate claims at 9% and quietly assumed its stop-loss recovery would move with it will find the recovery underbooked and the net retained cost higher than modeled. It also shows up in attachment adequacy: a $250,000 deductible that was priced correctly in 2023 sits materially lower in the loss distribution today, so more of the claim count now pierces it. The band just above the attachment point is where orthopedic and musculoskeletal frequency and the doubling of million-dollar claims land first.
What this means for your next review
Ask your stop-loss actuary or broker to trend the reimbursed layer separately from gross plan cost, using a leveraged trend factor rather than the plan’s medical trend. Test whether your current attachment still sits where it did in the loss distribution when you set it, and price the deductible increase against the retained-claim risk you would take back. Group captives should confirm the pooled layer’s confidence-level funding reflects the same leverage. Segal’s finding tracks the broader 15-year high in employer health cost and the acceleration in high-cost claims already in the data.
An independent reserve review brings a second pair of eyes that is free of the TPA’s or fronting carrier’s incentive structure. We are working on a directory of independent reviewing actuaries. If you would like to be considered, get in touch.
Decision-maker checklist
- Ask for a leveraged trend factor on the specific layer, separate from the plan’s gross medical trend.
- Re-run where your current specific deductible sits in the claim distribution versus when it was set.
- Price any deductible increase against the retained claims you would absorb below the new attachment.
- Confirm your aggregate accrual reflects rising frequency of claims crossing the specific.
- Group-captive owners: check that pooled-layer funding uses leveraged, not blended, trend.
Sources
- Segal, Rate of Increase in Medical Stop-Loss Premiums Accelerates to Nearly 13% (July 1, 2026)
- Segal, Q3 2026 Trends: Stop-Loss Insurance
- actuary.info, Employer Health Costs Hit 15-Year High at $18,500 Per Worker
- Voya Financial stop-loss paid claims analysis, via Benefits Blake, Stop-Loss Rate Increases 2026