What is stop-loss insurance?
Stop-loss insurance is a policy that reimburses a self-funded employer when medical claims exceed a set dollar threshold. You pay employee medical bills through your own plan; once claims cross that level, the carrier pays the excess back.
That's the practical stop-loss insurance meaning: protection for the employer's budget, not a benefit for employees. Your workers never file against it, and their coverage doesn't change.
You'll also see it called medical stop-loss insurance, stop-loss medical insurance, or excess-loss coverage. Whatever the label, it sits behind self-funded health plans as a financial backstop.
Why Stop-Loss Insurance Exists
A self-funded plan's exposure is technically unlimited: the ACA removed lifetime and annual dollar limits on essential health benefits. Meanwhile healthcare costs keep climbing - several gene therapies list between $2 million and $4.25 million per treatment. Stop-loss protection exists so one catastrophic case doesn't turn medical costs into a balance-sheet event.
How Does Stop-Loss Insurance Work?
The mechanics are simpler than the contracts make them look. Your company funds medical bills as they're processed, usually through a third-party administrator (TPA). The TPA tracks two numbers all year: each individual claimant's total, and the whole group's total.
When either crosses the contract threshold, the carrier reimburses the excess. Coverage runs on a policy period - typically 12 months - and resets at renewal.
Most employers buy through their broker; some join a group captive insurance program instead, pooling risk with other employers to steady pricing from year to year.
Types of Stop-Loss Coverage
There are two forms of stop-loss coverage, and most self-funded employers carry both.
Specific Stop-Loss
Specific coverage caps your exposure to any one person. You choose a per-person deductible - commonly $25,000 for small groups up to $500,000+ for large ones - and the carrier reimburses anything one claimant costs beyond it. Specific stop loss is what protects you from the $600,000 cancer case or the premature twins in the NICU.
Aggregate Stop-Loss
Aggregate coverage caps what your entire plan spends in total. The carrier sets an attachment point - typically 125% of your expected claims for the year - and reimburses whatever total employee claims exceed it. Aggregate stop loss protects you from the quieter problem: not one catastrophic case, but an expensive year everywhere at once.
Combined Stop-Loss
Most employers buy both coverages together, from one carrier, under a single contract. Combined stop-loss coverage is cheaper to administer, avoids gaps between policies, and gives you one renewal negotiation instead of two.
Specific vs. Aggregate Stop-Loss at a Glance
Here's how the two types of stop loss coverage compare:
Specific vs. Aggregate Stop-Loss at a Glance
|
Specific stop loss |
Aggregate stop loss |
| What it caps |
One person's claims |
The whole group's total claims |
| Reimbursement triggers when |
An individual passes the per-person deductible |
Total claims pass the annual threshold |
| Typical threshold |
$25K–$500K+ per person |
125% of expected annual claims |
| Protects against |
A single catastrophic case |
A bad year across the whole plan |
Stop-Loss Health Insurance Examples
Here's a simple stop-loss health insurance example for each coverage type.
Specific: Your plan carries a $100,000 individual deductible. An employee's cancer treatment costs $600,000 this year. You fund the first $100,000; the carrier reimburses the remaining $500,000.
Aggregate: Expected claims are $4 million, so the annual threshold is set at 125% of that - $5 million. Claims land at $5.3 million; the carrier reimburses the $300,000 overage.
In both cases the plan paid providers as usual, and stop-loss insurance restored the money afterward. That timing detail matters: reimbursement follows payment, it doesn't replace it.
Key Terms: Attachment Point, Deductible, and Stop-Loss Limit
Three terms do most of the work in a stop-loss policy.
The attachment point is the dollar level where the carrier's reimbursement obligation begins. In practice it's used interchangeably with deductible - specific contracts usually say deductible, while aggregate contracts stick with the longer term.
The policy period is the 12-month window the coverage applies to - and when a claim must be incurred and paid to count (see policy anatomy below).
What Is a Stop-Loss Limit in Insurance?
It's the ceiling on what the carrier will reimburse. Many specific policies now carry unlimited maximums, while aggregate contracts often cap reimbursement at $1 million to $2 million per year. Always check the stop loss limit before you sign - a low cap quietly hands tail risk back to you.
How Stop-Loss Claims Work
Reimbursement isn't automatic. Your TPA files with the carrier, documenting that employee claims were eligible, incurred, and actually paid inside the policy period. Most stop loss insurance contracts also require notice once any claimant reaches about 50% of the specific deductible.
If cash timing is a concern, ask about advance-funding riders, which pay large reimbursements up front rather than weeks after you've written the check.
Understanding Stop-Loss Premiums
Your stop-loss premium reflects group size, deductible level, demographics, industry, claims history, and plan design - and carriers' underwriting practices vary enough that two quotes on the same group can look nothing alike.
The market is also hardening. Segal reports medical stop-loss premiums rising nearly 13% at renewal, driven by specialty drugs, gene and cell therapies, and healthcare costs generally.
Two practical notes. A higher deductible cuts the stop-loss premium but raises your retained risk, so model both before renewal. And every policy adds one more monthly carrier invoice to reconcile against enrollment - platforms like Tabulera's Consolidated Invoicing automate that part.
Stop-Loss Policy Anatomy - What's Actually in the Contract
This is where employers get surprised, so read the contract, not just the proposal.
Contract basis. A 12/12 contract covers claims incurred and paid inside the same policy period. A 12/15 adds three months of run-out for late-arriving claims; a 15/12 covers run-in from the prior year. Mismatched bases at renewal create gaps.
Lasers. A laser sets a higher deductible on one named high-cost individual, shifting that person's risk back to you. Read laser provisions carefully, and ask about no-new-laser guarantees with renewal rate caps.
Definitions and limits. Confirm the stop-loss policy covers expenses exactly as your plan document defines them, and check the stop loss limit.
Disclosure. Carriers require full disclosure of known high-cost claimants at quoting; gaps can void reimbursement.
Key Benefits of Stop-Loss Insurance
Beyond surviving one bad year, the coverage earns its keep six ways.
Financial predictability
Your worst case becomes a known number - per person and in total - so finance can actually budget the plan year.
Catastrophic claim protection
Claims above $3 million are most often driven by musculoskeletal conditions, premature births, and cancer, according to Sun Life's 2026 high-cost claims report. Stop-loss coverage makes that tail survivable.
Lower long-term costs
In good years, unspent claims budget stays with you instead of becoming carrier profit. Paired with cost containment programs, the surplus compounds.
More plan flexibility
Self-funded health plans let you design the network, formulary, and benefits your workforce actually uses - with a backstop behind every choice.
Better cash flow planning
Advance funding and monthly aggregate accommodation smooth reimbursement timing, so a large claim doesn't drain operating cash while you wait.
Customizable deductibles
Retention levels dial up or down at each renewal to match your cash position and risk tolerance as the company grows.
Stop-Loss Insurance vs. Fully Insured Plans
With fully insured health plans, you pay a fixed premium and the carrier keeps whatever it doesn't spend - KFF puts the 2025 average family premium at $26,993, up 6% in a year. Self-funding plus stop loss insurance flips the model: you fund actual claims, keep the surplus in good years, and insure only the catastrophic tail. That trade is why 67% of covered workers now sit in self-funded plans. Captive insurance arrangements offer a middle path, giving mid-sized employers shared scale. Either way, stop-loss insurance is what makes self-funding rational rather than reckless.
Stop-Loss Insurance vs. Traditional Health Insurance
They're different products entirely. Traditional health insurance pays medical providers on behalf of covered members. Stop-loss reimburses exactly one policyholder - the employer - after plan spending crosses a threshold. Your employees will never see an ID card for it, file against it, or notice it exists.
Is Stop-Loss Insurance Right for Your Business?
Self-funding with stop-loss insurance generally starts to make sense around 100 enrolled employees; smaller companies increasingly get there through a group captive insurance program. Beyond headcount, the honest checklist is short: stable cash flow to fund claims weekly, access to your own claims data, leadership comfortable holding some risk, and a broker who works this market daily. If those hold, the question isn't whether you can afford stop-loss coverage - it's how much retention you want to keep.
Final Thoughts
Stop-loss insurance turns an unlimited liability into a budgetable one - that's the entire pitch. Just go in knowing it adds a second carrier relationship - another contract to read, another invoice to audit, another reimbursement stream to track, whether you buy directly or through captive insurance. That administrative layer is where plan budgets quietly leak, and it's the part software can own: Tabulera's Benefits Reconciliation platform audits every carrier invoice against enrollment automatically, stop-loss included. Protect the budget twice - once with the policy, once with the reconciliation.
