By Jude Odu

June 10, 2026

For self-insured plans that renewed stop-loss coverage at the start of 2026, many plans saw increases approaching or exceeding 20%, especially those with recent large claims. This reflects what stop-loss carriers are seeing in the data. The number of claims exceeding $1 million per million covered employees rose 29% in 2024. Claims exceeding $3 million jumped 47% in the same period. Gene therapies that carry six-figure and seven-figure price tags are moving from experimental to standard of care. Carriers are pricing for a world where catastrophic claims are the new normal.

If you have not reviewed your stop-loss structure since your last renewal cycle, you are likely carrying more risk than you intended or paying more than your claims history justifies. Here is what self-insured plan sponsors must do now.

Understand What Is Actually Driving the Increases

Stop-loss premiums do not rise in a vacuum. Carriers typically look at two years of prior claims data, current drug and medical cost trends, and the specific risk profile of your covered population. In 2026, three factors are dominating the pricing conversation.

First, specialty pharmacy. Specialty drugs make up more than 40% of pharmacy spend and are a leading driver of the 2026 cost trend. The fastest-rising segment is gene therapy. A single infusion for a condition like spinal muscular atrophy or hemophilia can cost $2 million to $4 million. CAR-T therapies for blood cancers run $400,000 to $750,000. These are no longer rare cases. As FDA approvals accelerate, more of your members will qualify for these treatments in any given plan year.

Second, GLP-1 drugs are generating secondary cost effects beyond the monthly prescription cost. Members on extended GLP-1 therapy are generating more claims for complications from underlying conditions that were previously managed through medication. Carriers are building that downstream utilization into their stop-loss pricing models.

Third, general medical cost inflation. Healthcare costs rose 7.9% per person in 2026, according to the Milliman Medical Index, the sharpest single-year increase in more than 15 years. Each dollar of underlying medical cost inflation increases your expected large-claim frequency. The math compounds quickly for self-insured plans with fewer than 5,000 covered lives.

Audit Your Specific and Aggregate Deductibles

Stop-loss coverage has two components: specific stop-loss, which pays claims above a per-member deductible, and aggregate stop-loss, which covers total plan costs above a set threshold. Most plan sponsors set these levels once at plan inception and do not revisit them until rates spike at renewal.

Your specific deductible, typically set between $100,000 and $500,000, determines when the carrier begins paying on an individual member’s claim. If yours is set at $200,000 and your population has five members on specialty biologics at $15,000 per month each, you are absorbing all of that cost in the plan year before any stop-loss reimbursement applies. Lowering your specific deductible increases your premium but reduces variance. The right threshold depends on your cash flow, reserves, and three-year claims history.

Your aggregate deductible functions as a corridor for total plan cost. If your plan expects $10 million in total annual claims and your aggregate attachment point is $11 million, you carry a $1 million risk corridor before aggregate coverage responds. Many plans set this corridor too wide. Request a corridor analysis from your TPA or stop-loss broker before your next renewal. Get the numbers in writing, not in a summary slide.

Do Not Let Your Carrier Set the Terms Unilaterally

Stop-loss renewal negotiations are not passive events. Carriers offer renewal terms based on their risk models. Your job is to come to that conversation with data from your own risk models. Pull your large-claim history for the past three years. Identify every claim that approached or exceeded your specific deductible. Verify that your carrier paid every qualifying claim on time and at the correct amount. If you had no large claims over the prior two years and are seeing a 20% rate increase, that presents a negotiating opportunity, not an inevitability.

Request competing quotes from at least three stop-loss carriers before each renewal. The market is competitive. Carriers will adjust terms to retain business, particularly when your claims history is favorable. Benchmark your specific deductible, aggregate attachment point, and premium per member per month against published industry standards for your employee count and industry sector. Your stop-loss broker should provide this benchmarking without being asked. If they cannot, that is information you need before your next renewal conversation.

Evaluate Whether a Captive Structure Reduces Your Long-Term Cost

Employee benefits captives have become the fastest-growing self-funding model among midsize employers in 2026. In a group captive, your plan contributes to a shared risk pool alongside other employer members. The captive absorbs mid-sized claims, typically in the $25,000 to $250,000 range per member, while traditional stop-loss covers catastrophic claims above that layer. This layered structure smooths year-to-year cost volatility and can reduce the effective cost of stop-loss coverage compared to standalone policies for employers with 200 to 1,000 employees.

Captives are not right for every employer. They typically require a two- to three-year commitment, upfront capitalization, and active participation in pooled risk management. But if your stop-loss costs are rising faster than your claims history warrants, a captive evaluation is worth the analysis. Ask your broker to model a group captive structure alongside your standalone renewal quote. If they have never mentioned it, ask why.

Document Every Decision for ERISA Fiduciary Compliance

ERISA’s prudent person standard applies to stop-loss decisions. A plan fiduciary who accepts the first renewal quote, does not benchmark competing carriers, and does not analyze the deductible structure relative to plan reserves is not meeting that standard. As courts and the DOL increase enforcement scrutiny of employer-sponsored plan administration, documentation of your stop-loss decision process is a requirement.

For every renewal cycle, create a written record that includes the quotes you received, the basis for selecting your carrier and deductible structure, the claims data you reviewed, and the individuals who participated in the decision. This documentation should take no more than 2-3 hours of administrative time. It is the difference between a defensible fiduciary decision and a personal liability exposure. The January 2026 DOL proposed rule on PBM fee disclosure, with 564 public comments submitted before the April 15 deadline, signals that regulators are watching every vendor relationship in your health plan. Stop-loss is no exception.

In Model Optimal Care: End U.S. Healthcare Waste, One Health Plan at a Time, Jude Odu is direct on this point: every vendor relationship in your health plan must be actively managed. That includes your stop-loss carrier. Passive renewal cycles are a fiduciary risk, not an administrative convenience.

What You Should Do Before Your Next Renewal

Stop-loss pricing in 2026 is not returning to 2021 levels. Gene therapy adoption will continue to accelerate. GLP-1 drugs will create downstream medical cost effects for years to come. General medical cost inflation is running above historical averages. The carriers know this. Your renewal quote reflects it.

Start now. Pull your large-claim history for the past 36 months. Request competing quotes from at least three carriers, even if your renewal is six months away. Run a corridor analysis on your aggregate deductible. Get a group captive comparison if you have 200 or more employees. Document the process. If your current TPA or broker cannot provide this analysis, find one who can before your next renewal cycle opens.

The data exists to make better stop-loss decisions. The question is whether your plan is using it.