Segal published its Q3 2026 stop-loss trends report in August 2026, drawing on data from 225 self-funded health plans. Average specific stop-loss premiums rose 12.7 percent, and the underlying claim data confirm that million-dollar-plus claims are growing at 25 percent per year compounded over four years. Carriers are absorbing that growth through a mechanism that does not show up in headlines: the laser.
A laser is a stop-loss carrier’s tool for managing known high-cost claimants at renewal. Rather than decline coverage or raise premiums uniformly, the carrier carves out specific individuals and applies a higher individual attachment point or removes them from stop-loss coverage entirely. The employer’s premium may be lower than the alternative. The employer’s retained exposure is materially higher.
What the trade press covers as a renewal strategy, this article examines as a reserve problem.
Who It Affects
Self-insured plan sponsors of all sizes are exposed whenever their stop-loss carrier applies a laser. The most acute situations involve:
- Mid-market employers (200 to 2,000 covered lives) where a single lasered claimant represents a meaningful share of expected plan claims
- Plans with active high-cost claimants in multi-year treatment protocols: gene therapy, solid tumor regimens, transplant recovery, and chronic specialty pharmacy
- Plans that have not had a formal IBNR review since their most recent stop-loss renewal
Benefits directors and CFOs who sign off on the quarterly accrual are the decision-makers. They may not know that a stop-loss laser is a structural change to retained risk that their actuary has not yet modeled.
The Reserve Mechanism
When a stop-loss carrier lasers a claimant, it raises the effective specific attachment point for that individual. A plan running a $300,000 specific deductible across the full group may find one claimant now carries a $750,000 specific deductible at renewal, or is excluded from the stop-loss program entirely.
The carrier’s underwriting action is immediate. The plan’s actuarial IBNR estimate is not.
IBNR for self-funded health plans is typically computed using net expected claims after stop-loss recovery, based on the stop-loss structure in place at the time of the last reserve study. If that study was completed in January using the prior policy year’s stop-loss terms, and a laser is applied at the February renewal, the net retained IBNR for that claimant is understated for the remainder of the plan year.
The gap is the difference between what the plan expected to retain and what it will actually retain if the claimant’s claims continue. For a claimant in active cancer treatment averaging $80,000 per month, a laser that raises the attachment from $300,000 to $750,000 adds $450,000 of unhedged retained exposure before the stop-loss carrier pays a dollar. If the plan’s IBNR reserve assumed the old $300,000 attachment, the reserve is understated by approximately $450,000 for that one claimant.
Across a plan with three or four active high-cost claimants, the aggregate reserve gap can be material.
The gap compounds for multi-year treatment protocols. Gene therapy, solid tumor, and transplant recovery programs routinely span two to three plan years. A laser applied in year one of a treatment course does not disappear at the next renewal; it typically rolls forward. The reserve understatement is not a single-year problem. It recurs until the treatment ends, the claimant exits the plan, or the plan purchases alternative coverage.
Stop-loss market loss ratios are running near 85 percent, confirming that carriers have priced this emerging risk into premiums and are transferring it back to plan sponsors through lasers. Most plan sponsors have not updated their IBNR reserves to reflect that structural change.
Where This Shows Up in Your Reserves
Open last quarter’s actuarial report and find the section on net expected claims or the net-of-stop-loss loss pick. The stop-loss structure used to compute those figures is a key assumption. If the report cites a specific deductible uniformly (for example, “$300,000 per individual”), it reflects the pre-laser structure. Any claimant carrying a laser should appear in that assumption at the lasered attachment, not the plan-wide deductible.
The diagnostic is direct: ask your actuary to list the assumed attachment point for each claimant projected to exceed $100,000 in the current plan year. Compare that list to the lasers in your current stop-loss policy. Any mismatch is an unbooked reserve gap.
On the schedule from your stop-loss carrier, lasers appear as individual-specific deductibles or named exclusions in the policy endorsements. They are not aggregated into the premium exhibit and are rarely reviewed by the finance team independently of the broker renewal summary.
What This Means for Your Next Review
Ask your actuary explicitly whether the current IBNR estimate uses the stop-loss structure as of today, including any lasers applied at the last renewal, or whether it still reflects the prior-year stop-loss terms. If the latter, request a revised net expected loss calculation that applies the current lasered attachment points to each active high-cost claimant.
The Segal Q3 2026 data shows $1M-plus claims growing at roughly double the rate of stop-loss premiums. A reserve review cadence appropriate for a prior-cost environment may not capture the structural changes that carriers are embedding at each renewal.
Decision-Maker Checklist
- Obtain the current laser schedule from your stop-loss policy and compare each lasered individual’s attachment point to the attachment assumed in your most recent IBNR estimate.
- Ask your actuary for a revised net expected loss calculation using the current stop-loss structure, not the structure in place at the last reserve study date.
- For each active high-cost claimant in a multi-year treatment protocol, quantify the retained IBNR if the laser carries forward through the expected treatment duration; document that figure as a contingent reserve item.
- Confirm that your aggregate stop-loss corridor calculation still holds assuming lasered claimants’ full claims count against the aggregate. A laser removes specific coverage but does not remove aggregate exposure; lasered claims still exhaust the aggregate faster than the prior model assumed.
- Review any “no new laser” provision in your stop-loss renewal proposal. These limit new lasers but do not cure lasers already in place.
- Flag any mid-year laser that raises retained exposure by $400,000 or more to your finance team as a reportable event warranting an interim reserve adjustment before the next quarter-end accrual.
An independent reserve review brings a second pair of eyes that is free of the TPA’s or stop-loss carrier’s incentive structure. We’re working on a directory of independent reviewing actuaries. If you’d like to be considered, get in touch.
Sources
- Segal Q3 2026 Stop-Loss Trends Report
- Total Control Health Plans: Stop-Loss Lasering Is on the Rise
- M3 Insurance: Lasers in Stop-Loss Insurance: A Strategic Risk Management Tool for Self-Funded Plans
- OneDigital: Lasering vs. Premium Adjustments: What Employers Should Know
- SHARx: What Is a Laser and Why Does It Matter