Executive Summary: Specific vs. Aggregate: Two Protections Solving Two Different Problems
LFP-02.02 — The Risk Layer#
Specific stop loss and aggregate stop loss address distinct risk categories, and the failure to understand both leaves the employer exposed to a class of risk their policy may not cover.
Specific stop loss targets catastrophic individual events: cancer treatment running to several hundred thousand dollars in a single plan year, a NICU stay costing $500,000 or more, hemophilia requiring hundreds of thousands annually in factor replacement therapy. The specific attachment point defines per-member retention. Claims below it are the plan’s responsibility; claims above it are the carrier’s. For groups of 10 to 50 lives, common attachment points range from $25,000 to $75,000. The 2025 Aegis Risk survey reported average premiums of $229.40 PEPM at a $100,000 attachment point. The premium curve is nonlinear: each incremental reduction in the threshold brings more frequent claims into the carrier’s liability, making the marginal cost of lower attachment points disproportionately higher.
Aggregate stop loss addresses a different and less understood risk: total group claims exceeding expected without any single member generating a catastrophic event. A 30-person group where three pregnancies, two orthopedic surgeries, four members starting GLP-1 prescriptions, and three members with poorly managed diabetes collectively push total claims to 130% of expected has no specific stop loss event. The aggregate attachment point, typically set at 120% to 125% of expected claims through a monthly factor calculation, determines whether the employer has protection against this scenario. The corridor between expected claims and the aggregate threshold, $125,000 on a $500,000 expected claims group with 125% aggregate, is the employer’s unprotected exposure. This protection operates on a different timeline than specific: aggregate reimbursement is calculated after the policy period and run-out close, often arriving 12 to 18 months after the plan year began.
The two protections interact through the aggregating-specific provision, a binary contract term whose significance most employers never examine. When specific claims aggregate into the aggregate calculation, a catastrophic claim triggering specific reimbursement reduces the amount counting toward the aggregate threshold. When they are excluded, the employer can face compounding exposures simultaneously. The paid-basis versus incurred-basis distinction adds another layer: a claim for surgery performed in December but paid in February may fall under different policy treatment depending on the accounting basis, affecting whether stop loss triggers in the current year, the next year, or not at all.
The most common failure mode is presenting stop loss as a single protection described by the specific attachment point. “Your plan is protected above $50,000 per person” describes specific stop loss and says nothing about aggregate. Not all level funded products include aggregate coverage. Employers with specific-only arrangements have no protection against moderate-utilization clustering that pushes total claims above expected without triggering a single specific event. Brokers who summarize stop loss terms rather than analyzing the interaction provisions leave the employer with a gap between the protection they believe they purchased and what the contract actually provides.