Your broker hands you the year-end stop-loss report. Paid claims land well below the attachment point. The numbers say you are due a refund. Five months later, bills still trickle in for services employees received in October, November, and December. The surplus shrinks. Then it vanishes.
That's the claims run-out trap baked into many level-funded health plans.
What level funding sells
A level-funded plan blends self-funding with a fixed monthly payment. The employer pays a set amount per employee each month. Part covers expected claims, part buys stop-loss insurance that caps exposure above a threshold. When actual claims come in below the funded amount, the employer gets a refund or credit. When they spike, the stop-loss kicks in. The pitch is budget certainty with an upside.
Mid-size groups eat it up. They want to dodge fully-insured rate hikes but fear the volatility of pure self-funding. Brokers compare the level-funded number against a BUCA renewal-Blue Cross, UnitedHealthcare, Cigna, Aetna-and the level-funded number usually looks cheaper. What gets far less attention is the liability that trails the plan year like a shadow.
The tail that eats the surplus
Claims run-out is the period after the plan year ends when the employer remains responsible for claims incurred during that year but paid late, a window that stretches three months, six months, sometimes a full year. It's written into the stop-loss contract. A specialist visit in December that doesn't get billed until February. A November surgery whose final invoice lands in March. A neonatal stay with charges arriving piecemeal for half a year. Each late bill rewrites the math on the surplus that looked solid in January.
This isn't a fringe scenario. In a fully-insured plan, the carrier swallows those late bills; the employer's obligation stops on the last day of coverage. In a level-funded plan, the employer's checkbook stays open long after the plan year closes. The stop-loss report delivered in January only counts paid claims through December 31. It ignores the tail. That tail often erases the entire projected refund and occasionally forces an additional back-end payment above the stop-loss attachment point. The "budget certainty" level funding markets depends on a clean run-out that rarely shows up on a mid-size group's medical book.
The ugliest version arrives when an employer leaves the level-funded plan-because the rate jumped or service fell apart-and then receives bills for months from a plan they no longer sponsor. No negotiating leverage. No broker actively managing the runoff. No real way to contest a claim incurred under the old arrangement. The switch that was supposed to cut costs creates an open-ended liability.
Why the late bills pile up
Run-out losses aren't random misfortune. They concentrate on late-stage medical events that could have been caught much earlier. A chronic condition that simmered until it became an emergency room admission in November. A missed screening that would have found a tumor when it was small and treatable, instead of generating six months of post-surgical billing. The claims run-out invoice is the bill a traditional plan sends for a system that rewards inaction and penalizes early intervention. Standard benefit design doesn't change that. It waits for claims to happen, then sorts out who pays.
Fix the input, not just the stop-loss
You can tinker with attachment points or buy extended run-out coverage, but that just moves money around. The better move is to reduce the claims that show up late in the first place.
WellthCare™ is the first Health-to-Wealth™ Benefit System. It sits alongside an employer's existing health plan and gets used first. Employees get $0-co-pay care, earn reward dollars at the WellthCare Store™ for verified preventive actions, and follow a personalized care plan-drafted by AI, reviewed by a nurse practitioner and physician. The downstream effect is direct: fewer undetected conditions turn into urgent, expensive episodes, so fewer large, late-filed claims clutter the run-out tail. The stop-loss report begins to reflect the group's actual health trajectory, not a gamble on billing cycles.
After 6 to 12 months of real usage, the patent-pending WellthCare Readiness Index™ hands employers their own data. It shows exactly which claims were intercepted upstream, how much primary-plan spending those prevented events would have generated, and the projected savings if the system expands. No industry benchmarks that might not match the group's demographics. No assumptions. The Index turns run-out from an abstract risk into a measured, shrinking number. It's the difference between hoping claims don't arrive late and knowing they were never generated at all.
Level-funded refund ads promise a payoff for a low-claims year. The truth is that the refund hinges less on claims activity during the year than on the randomness of billing cycles afterward. Employers that want the upside of low claims without the tail exposure can put a benefit in front of the primary plan that catches what breaks people later. When you change the input, the run-out shrinks to a rounding error instead of a budget headache.
See what a WellthCare Plan would look like for your team.
This article is for general information only and is not legal, tax, or medical advice. Employers should consult their own advisors.