Reinsurance is insurance that insurance companies buy to protect themselves against catastrophic losses or unexpectedly high claims. The original insurer (called the “cedent”) transfers part of its risk to a reinsurer in exchange for part of the premium — the same way a homeowner buys protection from a carrier.
You don’t sell reinsurance. But your self-funded employer clients buy a close cousin called stop-loss insurance, and they routinely call it “reinsurance” by mistake. Knowing the difference is one of those small details that separates the broker who answers the literal question from the broker who solves the real problem.
Reinsurance Meaning in Plain English
The term is exactly what it sounds like: “re” plus “insurance.” It’s the practice of insuring something that’s already been insured. The carrier that issues the original policy is the cedent — they cede risk. The carrier that takes on the transferred risk is the reinsurer. Reinsurers themselves can buy reinsurance to spread risk further down the chain — that’s called retrocession.
Quick definition: Reinsurance is a contractual arrangement in which one insurance company (the cedent) transfers all or part of its risk under insurance policies it has issued to another insurance company (the reinsurer), in exchange for a portion of the premium.
The National Association of Insurance Commissioners frames reinsurance as “insurance for insurance companies” and lists several reasons carriers use it:
- Expanding capacity to underwrite more business
- Stabilizing underwriting results across years
- Protecting against catastrophic losses (hurricanes, pandemics, mass-casualty events)
- Spreading risk geographically or by line of business
- Acquiring expertise in new product lines or markets
Without reinsurance, every property insurer in Florida would have collapsed after the first major hurricane. Reinsurance is what makes large-scale primary insurance economically possible.
A Quick Example: How a Reinsurance Layer Actually Works
A concrete number makes this click. Suppose a life insurance carrier issues 10,000 group life policies, each with a $500,000 death benefit. Total exposure is $5 billion. In any normal year, expected claims sit comfortably within reserves. But a black-swan year — a pandemic, a mass-casualty event, a regional disaster — could blow through reserves and threaten solvency.
Instead of bearing all of that risk, the carrier enters a treaty reinsurance contract: it cedes everything above $250,000 per claim to a reinsurer in exchange for a percentage of premium. After the deal:
- The carrier keeps $250,000 of risk per claim and the corresponding share of premium
- The reinsurer takes the layer above $250,000 — and gets paid for it
- Maximum exposure per claim drops by 50%
- Underwriting volatility drops sharply
- The carrier can now write more policies because it’s no longer capital-constrained
That’s reinsurance in one paragraph: capacity expansion and volatility reduction in exchange for ceded premium.
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Reinsurance vs. Stop-Loss: The Distinction Every Broker Should Know
Here’s the section every other reinsurance article skips and every benefits broker needs.
Reinsurance and stop-loss insurance look almost identical on paper. Both transfer risk above a defined attachment point. Both come in specific (per-claim) and aggregate (total-claims) flavors. Both function as a financial backstop for entities that bear claims risk. They’re so similar that the industry literature sometimes uses “employer reinsurance” as a synonym for stop-loss.
The legal distinction is who’s buying it:
- Reinsurance covers a licensed insurance carrier for its obligations under insurance policies it has issued
- Stop-loss insurance covers a self-funded employer for its obligations under a health benefit plan
The NAIC white paper on stop-loss insurance and self-funding draws the line cleanly: the actuarial risk is the same, but the regulatory and legal frameworks differ. Reinsurers don’t have to be licensed in the cedent’s state because the cedent is already a regulated insurer. Stop-loss carriers face a different framework — and that framework varies by state, with some treating stop-loss as a health insurance line and others treating it as casualty.
The practical takeaway for brokers: when a self-funded client says “I want to add reinsurance,” they almost certainly mean “I want to buy or improve our stop-loss coverage.” Ask one clarifying question:
“Are you talking about the policy we have to limit our exposure on big claims, or something on the carrier side?”
The answer is almost always stop-loss. From there, the conversation pivots to attachment points, contract basis, and lasering — not to treaty terms with a Bermuda reinsurer.
Stop-Loss for Self-Funded Plans: The Product Brokers Actually Place
Stop-loss is the practical product brokers actually sell or advise on. Two flavors dominate.
Specific stop-loss (individual attachment point)
Specific stop-loss reimburses the employer when claims for any one covered individual exceed a per-person attachment point — usually between $25,000 and $250,000 depending on group size and risk tolerance. If the specific attachment is $50,000 and one employee runs $200,000 in claims for the year, the stop-loss carrier reimburses the employer $150,000.
Smaller groups carry lower specific attachment points. Larger groups, with more predictable claim distributions, can afford higher attachments and lower premiums.
Aggregate stop-loss (group-wide attachment point)
Aggregate stop-loss reimburses the employer when total claims for the entire group exceed a defined annual threshold — usually expressed as a percentage of expected claims, commonly 120–125%. If expected annual claims are $1 million and the aggregate corridor is 125%, the attachment point is $1.25 million. Total claims of $1.5 million would trigger a $250,000 reimbursement under aggregate.
Most self-funded employers buy both specific and aggregate. Specific protects against the catastrophic individual case; aggregate protects against the bad year overall.
How attachment points get set
The right attachment balances stop-loss premium against employer risk tolerance. The variables that matter:
- Group size — smaller groups need lower attachment points
- Claim history — predictable groups can take more risk
- Cash flow — can the employer absorb a six-figure hit before reimbursement processes?
- Industry — high-acuity sectors (some manufacturing, certain trades) often need lower attachments
- Market conditions — stop-loss premiums fluctuate year to year
Lower attachment = more protection but higher premium. Higher attachment = lower premium but more employer exposure. The sweet spot is client-specific.
Lasering — the high-cost-claimant trap brokers should warn clients about
This is the section that earns brokers credibility with clients who haven’t run into it yet.
When a self-funded plan has a known high-cost claimant — active cancer treatment, transplant candidate, hemophilia patient, premature infant in the NICU — the stop-loss carrier knows that claimant will likely produce a large claim in the coming policy year. At renewal, the carrier may “laser” that individual: either exclude them from stop-loss coverage entirely or assign them a much higher per-person deductible (for example, $500,000 instead of the standard $50,000).
The employer is left bearing all or most of that individual’s claims directly. On a claim that runs $800,000, that’s a six-figure surprise the employer didn’t have last year.
Strategies brokers use to manage lasering exposure:
- “No new lasers” provisions in the renewal contract
- Multi-year stop-loss contracts that lock pricing and laser terms
- Aggregating specific provisions that bundle multiple sub-laser claims into the aggregate
- Switching carriers where market conditions allow it
Captives and Level-Funded: The Middle-Ground Plays
Not every employer is big enough for true self-funding. Two structures bridge the gap, and both depend on stop-loss mechanics under the hood.
Stop-loss captives let small and mid-size employers (often 50–500 covered lives) pool their stop-loss risk together. The captive itself holds the stop-loss layer above each member employer’s specific attachment, and reinsures above a higher group-wide attachment. Members benefit from collective purchasing power and shared risk smoothing while still getting self-funded plan flexibility — claims data access, plan design control, ASO efficiencies.
Level-funded plans wrap the self-funded model into a fixed-monthly-payment product that feels like fully-insured. A non-BUCA carrier (often paired with a TPA) collects a level monthly amount, pays claims, holds reserves, and reconciles annually — refunding surplus to the employer or absorbing modest deficits within contract limits. For employers anxious about cash flow volatility, level-funded removes that variable while still capturing the favorable-claims upside that fully-insured plans don’t share.
For groups in the 25–250 employee range, captive and level-funded options are often more accessible than full self-funding — and this is exactly where non-BUCA carriers compete hardest.
What Brokers Should Watch at Renewal
Five questions every self-funded client renewal should answer about their stop-loss:
- Were any new lasers added? If yes, what’s the financial impact and is a no-new-laser carrier available?
- Did the specific or aggregate attachment point change? Attachment creep is one of the quieter ways stop-loss premiums effectively go up.
- What’s the contract basis — paid, incurred, or 12/12? Switching basis at renewal can create a coverage gap. (12/12 means claims incurred in 12 months and paid in 12 months. A 12/15 or 24/12 basis gives more runout protection but costs more.)
- Are there aggregating specific provisions? These bundle multiple sub-attachment claims into the aggregate calculation — sometimes valuable, sometimes a disadvantage depending on claim distribution.
- Is the current stop-loss carrier the right fit, or should we shop? TPAs sometimes bundle stop-loss with administration. Unbundling can produce savings for clients large enough to manage two vendor relationships.
When in doubt, shop the layer. Stop-loss is one of the most price-sensitive products in the benefits stack, and the spread between carriers on the same group can be meaningful.
Frequently Asked Questions
What is reinsurance in simple terms?
Reinsurance is insurance that insurance companies buy to protect themselves against catastrophic losses or unexpectedly high claims. The original insurer transfers part of its risk to a reinsurer in exchange for part of the premium.
Is stop-loss insurance the same as reinsurance?
No, but they’re closely related. Reinsurance covers a licensed insurance carrier for its obligations under policies it issues. Stop-loss insurance covers a self-funded employer for its obligations under its own health plan. The mechanics — attachment points, specific and aggregate flavors, premium for risk transfer — are nearly identical, but the purchaser, regulation, and legal treatment differ.
Who needs reinsurance?
Insurance carriers themselves need reinsurance to manage capital requirements, smooth underwriting volatility, and protect against catastrophic losses. Self-funded employers don’t buy reinsurance directly — they buy stop-loss insurance, which serves a similar function for an employer-sponsored health plan.
What are the main types of reinsurance?
Treaty reinsurance covers a defined book of business under standing terms; facultative reinsurance is negotiated on a single risk basis. Within both, proportional reinsurance shares premium and losses on a percentage basis, while non-proportional (excess of loss) reinsurance kicks in only above a defined attachment point.
What does “lasering” mean in stop-loss insurance?
Lasering is when a stop-loss carrier excludes a specific high-cost claimant from coverage at renewal, or assigns that individual a much higher per-person deductible than the rest of the group. It transfers the financial risk of that claimant back to the self-funded employer. Brokers can sometimes negotiate “no new laser” provisions to limit this exposure.
Talk to a GA Who Sweats This Stuff
Stop-loss is one of those products where the difference between an average broker and a great one shows up at claim time, when a six-figure surprise lands on a client’s desk that a stronger renewal review would have caught. Brokersbloc helps benefits brokers get access to non-BUCA carriers — and stop-loss is one of the markets where non-BUCA carriers compete hardest, with pricing and contract terms that the big-name carriers often won’t match.
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