Aggregate Stop Loss
A reinsurance or excess insurance mechanism that caps the total losses an insured or self-insured entity will pay in a policy period, protecting against accumulation of losses.
What It Is
Aggregate Stop Loss insurance provides a ceiling on the total amount of claims an organization will pay during a policy period. Once cumulative claims exceed the aggregate attachment point, the stop loss insurer pays excess claims up to the policy limit.
Aggregate stop loss is commonly used by self-insured employers (particularly for workers compensation and group health), captive insurance companies, and large deductible programs. The attachment point is typically set at 125-150% of expected claims, meaning the insured absorbs normal variation but is protected against catastrophic accumulation.
For self-insured group health plans, aggregate stop loss works alongside specific stop loss (which caps individual claims) to create a complete risk management framework. The aggregate addresses the scenario where no single claim is catastrophic but the total volume of claims significantly exceeds expectations.
Why It Matters for Brokers
Brokers serving large employers with self-insured programs must understand aggregate stop loss because it is the last line of defense against a catastrophic claims year. Setting the attachment point too high leaves excessive risk with the client; setting it too low makes the coverage expensive and defeats the purpose of self-insurance. The interplay between specific and aggregate stop loss requires careful analysis.
Real-World Example
A self-insured employer with 2,000 employees carries a group health plan with expected annual claims of $12M. They purchase aggregate stop loss with a 125% attachment point ($15M) and a $5M aggregate limit. In an unusually bad year, total claims reach $16.8M due to several expensive cancer treatments and a cluster of premature births. The aggregate stop loss reimburses $1.8M (the amount exceeding $15M), capping the employer's total claims exposure at $15M plus the stop loss premium.
Common Mistakes
- 1Not accounting for claims run-out when calculating aggregate liability — claims incurred in one year may not be paid until the next, complicating the aggregate calculation.
- 2Setting the aggregate attachment point based solely on budgeted claims without adjusting for the statistical probability of adverse deviation, leading to either over-spending on coverage or inadequate protection.
- 3Confusing aggregate stop loss with specific stop loss — aggregate covers total accumulation while specific covers individual large claims.
How brokerageaudit.com Handles This
The system models aggregate stop loss scenarios using historical claims data and actuarial projections. It tracks cumulative claims against the aggregate attachment point throughout the policy year, alerting brokers when their client is approaching the aggregate threshold.