Why Your Stop-Loss Premium Jumps 30% When Claims Only Grew 10%

The Math Your Carrier Understands and You Probably Don't

You renewed your stop-loss policy and the premium jumped double digits. Your claims didn't grow nearly that fast. So what happened?

The answer is leveraged trend. It's the reason stop-loss carriers reprice more aggressively than your underlying medical costs would suggest. And if you don't understand it, you can't negotiate against it.

Here's how it works. Say you have a $100,000 specific deductible and a member files a $150,000 claim. Your stop-loss carrier covers $50,000. Now apply 10% medical trend. That same claim costs $165,000 next year. Your carrier's exposure jumps to $65,000. That's a 30% increase in carrier liability from a 10% increase in claim cost. The math is simple. The implication is expensive.

Medical Inflation Hits Carriers Harder Than It Hits You

Medical inflation has consistently outpaced general economic inflation. That gap matters more above your specific deductible than below it. As Berkley Accident and Health notes, this disproportionately affects stop-loss carriers more than self-funded employers themselves, and it flows directly into your renewal rates.

The result is what we saw in 2025. According to Meridian Risk Management, stop-loss premiums are landing in the high single digits to low double digits. Employers with poor claims experience are seeing increases closer to 20%.

The Claims Driving Carrier Anxiety

Leveraged trend is worst when the underlying claims are expensive. And plan sponsors know exactly which claims they're worried about.

The Aegis 2025 Medical Stop-Loss Premium Survey, covered by IFEBP, found cancer is the top catastrophic claim concern for 92% of plan sponsors in 2025, up from 83% the year before. Specialty pharmacy came in second at 47%. Heart and cardiovascular claims concerned 29% of sponsors.

Cell and gene therapy hit 24%. These aren't cheap claims hovering near your deductible. They blow past it. And every dollar above your specific deductible is a dollar the carrier covers, subject to full leveraged trend math.

What You Can Actually Do About It

You have a few levers. First, understand that your specific deductible level directly controls your carrier's risk exposure. A lower deductible means the carrier takes on more claims, more often, and prices accordingly. A higher deductible reduces their exposure but increases yours.

That tradeoff needs analysis, not guesswork. Ask your broker to model leveraged trend explicitly at renewal. Show the math.

If a claim at $120,000 against a $100,000 deductible becomes $132,000 next year with 10% trend, carrier liability doubles from $20,000 to $32,000. That's 60% growth on the carrier's number. Knowing that helps you evaluate whether to raise your deductible or buy back coverage.

Leveraged trend isn't a trick. It's arithmetic. The question is whether your advisor explained it before your last renewal or after the double-digit increase landed on your desk.