Stop-Loss Insurance: How to Structure Coverage That Actually Protects Your Plan

When an employer self-funds their health plan, they assume direct financial responsibility for employee claims. Stop-loss insurance transfers the risk of large claims back to an insurer — but only up to the limits and under the conditions spelled out in your contract.

There are two types: specific stop-loss, which covers individual claims that exceed a set threshold (the specific deductible or attachment point), and aggregate stop-loss, which kicks in when total plan claims exceed a percentage of expected costs — typically 125 percent.

Specific stop-loss is the more critical of the two. If a single employee incurs $800,000 in claims and your specific deductible is $150,000, your stop-loss carrier reimburses the remaining $650,000. Aggregate stop-loss is a secondary backstop for years when claims are broadly elevated across the entire population.

The specific deductible — the dollar threshold at which stop-loss coverage activates — is the single most important variable in your stop-loss contract. Set it too high and you are self-insuring more risk than your cash flow can absorb. Set it too low and you are paying premium for coverage that activates on claims your plan could handle without reinsurance.

For most employers with 100 to 500 employees, specific deductibles typically range from $75,000 to $250,000 per member per year. The right number depends on your plan's cash reserves, your risk tolerance, your claims history, and the demographics of your workforce. An employer with a younger, healthier population can often carry a higher deductible and capture more premium savings. An employer with an older workforce or known high-cost claimants should consider a lower threshold.

Stop-loss contracts are not standardized. The terms vary significantly across carriers, and the differences in contract language can mean the difference between a paid claim and a denied one. The most important provisions to scrutinize are the lasering clause, the accommodation clause, the run-in and run-out provisions, and the definition of a covered claim.

Lasering is the practice of excluding specific high-cost individuals from stop-loss coverage or assigning them a higher individual deductible at renewal. If a member has a known chronic condition or is mid-treatment for an expensive illness, the carrier may laser that individual — meaning your plan bears full financial exposure for their claims regardless of cost. Lasering is legal and common. Understanding your carrier's lasering practices before you sign is essential.

Run-in and run-out provisions determine which claims are eligible for reimbursement based on when services were incurred versus when claims were paid. A paid contract reimburses claims paid during the contract period regardless of when services occurred. An incurred-and-paid contract requires both the service and the payment to fall within the contract year. The difference matters most at renewal — if you switch carriers, claims incurred in one year but paid in the next may fall into a gap.

The accommodation clause governs what happens when a member exceeds the specific deductible mid-year. Some carriers require the employer to continue paying claims above the deductible until the carrier formally acknowledges the accommodation. Others have automatic accommodation provisions. Know which applies to your contract.

Aggregate stop-loss does not protect you from a single bad year in the way most employers assume. The aggregate attachment point is typically set at 125 percent of expected claims — meaning your plan must absorb claims equal to 125 percent of your projected annual cost before aggregate coverage activates. In a year where claims run 115 percent of expected, you bear the full overrun. Aggregate stop-loss is a protection against catastrophic population-wide events, not routine volatility.

Some carriers offer lower aggregate attachment points — 110 or 115 percent — for an additional premium. Whether that is worth the cost depends on your plan's financial cushion and your board's or ownership's appetite for variance.

Not all stop-loss carriers are equal. The market includes large, well-capitalized carriers with long track records and smaller specialty carriers that may offer more competitive pricing but carry more counterparty risk. When evaluating carriers, look at their AM Best financial strength rating, their claims payment history, their lasering practices, their renewal rate history, and whether they offer multi-year rate guarantees.

The cheapest stop-loss quote is rarely the best stop-loss quote. A carrier that lasers aggressively at renewal, denies claims on technicalities, or exits the market during a hard insurance cycle is not protecting your plan — it is collecting your premium.

Working with a stop-loss consultant or a TPA with strong carrier relationships can give you access to better terms and more transparent pricing than going to market alone. The stop-loss market is relationship-driven, and the quality of your advisor matters.

Many employers who think they are self-funded are actually on level-funded arrangements — a hybrid product where the employer pays a fixed monthly amount that includes an embedded stop-loss component. Level-funded plans offer some of the cost advantages of self-funding with more predictable cash flow, but the stop-loss terms are often less favorable than what a fully self-funded employer can negotiate independently.

If you are on a level-funded plan and your stop-loss is bundled with your TPA or carrier, it is worth asking whether you could get better terms by separating those relationships.

Stop-loss is not a set-it-and-forget-it decision. It should be reviewed at every renewal, benchmarked against the market, and structured to match your plan's actual risk profile — not the default terms your broker brought to the table last year.