Key Takeaways
- Stop-loss insurance is not health insurance — it is a reimbursement contract that caps the employer's financial exposure on large individual claims and catastrophic plan years.
- Specific stop-loss covers individual claimants above the attachment point; aggregate stop-loss covers total plan claims above a percentage of expected costs.
- The attachment point is the most important financial lever in a stop-loss contract — setting it too high leaves the employer exposed; too low and the premium erodes the savings from self-funding.
- Laser provisions, terminal liability, and run-in/run-out terms are contract details that can cost employers millions if not understood and negotiated.
- Stop-loss should be shopped every year — the market is competitive and rates vary significantly between carriers for the same risk profile.
What Stop-Loss Insurance Is — and Is Not
Stop-loss insurance is a reimbursement contract between the employer (as plan sponsor) and a stop-loss carrier. When the employer's self-funded plan pays claims that exceed defined thresholds, the stop-loss carrier reimburses the employer for the excess. It is not health insurance for employees — employees never interact with the stop-loss carrier. It is financial protection for the employer.
Without stop-loss, self-funding would be viable only for the largest employers with the deepest reserves. Stop-loss is what makes self-funding accessible to mid-size and smaller employers by converting unlimited claims exposure into a manageable, predictable cost.
Stop-loss is not optional for most self-funded employers — it is the foundation of a financially viable plan. An employer who self-funds without stop-loss is fully exposed to catastrophic claims. A single premature birth, cancer diagnosis, or organ transplant can generate $500,000 to $2 million in claims. Without stop-loss, that cost falls entirely on the employer.
Stop-loss premiums are typically 15 to 25% of total plan cost for a well-structured self-funded plan. If your stop-loss premium is significantly higher than this range, your attachment point may be set too low — you are buying more protection than you need. If it is significantly lower, your attachment point may be too high and your exposure too great.
Stop-loss is not the same as reinsurance, though the terms are sometimes used interchangeably. Reinsurance is a carrier-to-carrier arrangement. Stop-loss is an employer-to-carrier arrangement. The distinction matters for regulatory purposes and for understanding your rights under the contract.
Specific Stop-Loss: Protecting Against Individual Claims
Specific stop-loss (also called individual stop-loss) reimburses the employer when a single member's claims in a plan year exceed the specific attachment point. Once a member's claims cross that threshold, the stop-loss carrier pays 100% of additional claims for that member for the remainder of the plan year.
- Common attachment points range from $50,000 to $500,000 per member per year, depending on employer size and risk tolerance.
- Lower attachment points mean more protection but higher premiums — the carrier is taking on more risk.
- Higher attachment points mean lower premiums but greater employer exposure on individual high-cost claimants.
- The attachment point applies per member, per plan year — it resets at the start of each new plan year.
For employers with 100 to 300 employees, a specific attachment point of $75,000 to $125,000 is typically appropriate. For 300 to 500 employees, $100,000 to $175,000. For 500+, $150,000 to $250,000 or higher. The right number depends on your cash reserves, your workforce demographics, and your appetite for claims volatility — not just what the market quotes.
The specific attachment point resets every plan year — but a member with a chronic condition will likely exceed it again next year. This is where laser provisions become dangerous. At renewal, the stop-loss carrier may laser that member — raising their individual attachment point dramatically or excluding them entirely. Understand your laser rights before you have a high-cost claimant.
Some stop-loss contracts include a "no new lasers" provision — the carrier agrees not to add new lasers at renewal for members who were not lasered in the prior year. This is a valuable protection worth negotiating for, especially if you have employees with chronic conditions that are likely to generate recurring high-cost claims.
Aggregate Stop-Loss: Protecting Against Catastrophic Plan Years
Aggregate stop-loss reimburses the employer when total plan claims for the year exceed the aggregate attachment point — typically set at 120 to 125% of expected claims. It is a backstop against a year where multiple members have high claims simultaneously, or where overall utilization is significantly higher than projected.
The aggregate attachment point is calculated as a percentage of the aggregate expected claims — a number derived from the employer's demographics, historical claims, and actuarial projections. Understanding how this number is calculated is essential to understanding your actual protection.
Aggregate stop-loss does not protect you claim-by-claim — it only activates when total annual claims exceed the aggregate attachment point. In a year where you have 3 or 4 high-cost claimants who each exceed the specific attachment point, specific stop-loss covers each one individually. Aggregate stop-loss is a separate, additional layer of protection for total plan volatility.
The aggregate attachment point is often set at 125% of expected claims — meaning you absorb the first 25% of adverse deviation before aggregate coverage kicks in. For a plan with $3 million in expected claims, that is $750,000 in additional exposure before aggregate activates. Make sure your cash reserves can absorb this before setting the aggregate attachment point.
Some stop-loss carriers offer aggregate accommodation — a provision that advances aggregate reimbursement during the plan year rather than waiting until year end. This is valuable for cash flow management. If your plan has a bad first half of the year, aggregate accommodation prevents you from funding a claims deficit for 6 months before reimbursement.
Critical Contract Terms to Negotiate
| Term | What It Means | Why It Matters |
|---|---|---|
| Laser provision | Carrier's right to raise or exclude a specific member's attachment point at renewal | Can leave employer fully exposed on a known high-cost claimant |
| Terminal liability | Coverage for claims incurred before termination but paid after | Critical if you change stop-loss carriers mid-year or at renewal |
| Run-in coverage | Coverage for claims incurred before the policy period but paid during it | Important when switching from a prior stop-loss carrier |
| Run-out coverage | Coverage for claims incurred during the policy period but paid after it ends | Protects against delayed claims filing after plan year end |
| Paid vs. incurred basis | Whether the contract covers claims when paid or when incurred | Affects which plan year's stop-loss covers a given claim |
| Aggregate accommodation | Advance payment of aggregate reimbursement during the plan year | Improves cash flow in high-claims years |
Terminal liability is the most commonly overlooked stop-loss contract term — and the most expensive to discover after the fact. If you terminate your stop-loss carrier and have a member with a large ongoing claim, claims incurred before termination but not yet paid may have no coverage unless your contract includes terminal liability or your new carrier provides run-in coverage. Always address this at every carrier transition.
Negotiate the laser cap before you have a high-cost claimant. Some contracts allow lasers with no cap — the carrier can raise a member's attachment point to any level. A laser cap provision limits the maximum attachment point for any lasered member, typically to 2 to 3 times the standard attachment point. This is a critical protection for employers with known chronic condition claimants.
Shopping and Renewing Stop-Loss
Stop-loss should be marketed every year — even if you are satisfied with your current carrier. The stop-loss market is competitive, rates vary significantly between carriers for the same risk profile, and your current carrier has no incentive to offer their best terms if they believe you will not shop.
- Start the marketing process 90 to 120 days before renewal — earlier if you have known high-cost claimants.
- Provide complete and accurate claims data to all carriers — incomplete data leads to conservative pricing.
- Compare not just premium but contract terms: laser provisions, terminal liability, run-in/run-out, and aggregate accommodation.
- Consider carrier financial strength — stop-loss carriers should have AM Best ratings of A- or better.
- Evaluate the carrier's claims payment history — how quickly do they reimburse and how often do they dispute claims?
Stop-loss carriers price risk based on the information you provide. Incomplete claims data, missing diagnosis codes, or gaps in reporting history will result in conservative (higher) pricing. The employer who provides the most complete, accurate data package gets the best rates. Work with your TPA to produce a clean, complete data package before going to market.
Some brokers place stop-loss with carriers who pay the highest commissions rather than the carriers who offer the best terms for the employer. Ask your broker to disclose their compensation from each stop-loss carrier they quote. A broker who refuses to disclose this information is not acting in your interest.
Your Action Steps
- 1Pull your current stop-loss contract and identify the specific attachment point, aggregate attachment point, laser provisions, and terminal liability terms.
- 2Ask your stop-loss carrier: "What is our current laser exposure?" — identify any members who are at or near the specific attachment point.
- 3Verify your contract includes terminal liability coverage or negotiate it into the next renewal.
- 4Request a stop-loss market analysis from your broker at least 90 days before renewal — require disclosure of broker compensation from each carrier quoted.
- 5Negotiate a laser cap provision if your contract does not already include one.
- 6Review your aggregate attachment point calculation — confirm you understand how expected claims are calculated and what your maximum aggregate exposure is.
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