Attachment Points and Lasers: The Math and the Consequences

Series 02: The Risk Layer | Article 02.04 | Sharp Analysis

Specific Attachment Point Selection

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The specific attachment point is the employer-facing output of the underwriting process analyzed in LFP-02.03. It defines the dollar threshold above which the stop loss carrier begins reimbursing the plan for an individual member’s claims. The selection of this threshold is a financial decision that shapes the employer’s risk profile for the entire plan year.

Stop loss carriers offer a range of specific attachment points. For small groups of 10 to 50 lives, common options include $25,000, $30,000, $40,000, $50,000, $60,000, and $75,000. The carrier sets the premium for each level. The relationship between attachment point and premium is not linear: the premium increase from $75,000 to $50,000 is proportionally smaller than the increase from $50,000 to $25,000. This reflects the frequency distribution of claims. Many more members will generate claims between $25,000 and $50,000 than between $50,000 and $75,000. Each incremental reduction in the attachment point brings more claims into the carrier’s liability, and the claims that enter the carrier’s exposure at lower thresholds occur more frequently. The 2025 Aegis Risk survey reported average stop loss premiums of $229.40 PEPM at a $100,000 attachment point and $50.98 PEPM at $500,000, illustrating the steep premium gradient as attachment points decline.

Some carriers set minimum attachment points based on group size or risk profile. A very small group of 5 to 10 lives may not be offered an attachment point below $40,000 or $50,000 because the carrier’s risk at low attachment points for micro-groups is too concentrated. The minimum attachment point constraint is itself an underwriting judgment: the carrier is telling the employer that the risk below a certain threshold is too high to insure at a price the market will accept.

The employer tradeoff is concrete. At a $25,000 attachment point on a 20-person group, the employer’s maximum retention per member is $25,000. If three members generate claims of $60,000 each, specific stop loss reimburses $35,000 per member ($105,000 total). The employer retains $75,000 ($25,000 per member), and the stop loss premium is high enough to price for this frequency of reimbursement. At a $75,000 attachment point on the same group, those three members at $60,000 each never trigger specific stop loss. The employer retains the full $180,000 in claims. The stop loss premium is lower, but the employer absorbed $105,000 more in unreimbursed claims.

The optimal attachment point produces the minimum total cost: claims fund plus stop loss premium. A lower attachment point increases stop loss premium but decreases expected unreimbursed claims. A higher attachment point decreases premium but increases unreimbursed claims. The total cost curve has a minimum, and finding it requires modeling both components for the specific group’s demographics and expected claims distribution. Most brokers select attachment points based on convention or carrier recommendation rather than explicit cost modeling for the individual group.

Aggregate Attachment Points and Corridor Risk

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The aggregate attachment point defines the group’s total claims threshold. It is typically expressed as a percentage of expected claims, commonly 120% to 125%, calculated through the monthly aggregate factor methodology described in LFP-02.02. The aggregate corridor, the gap between expected claims and the aggregate attachment point, is the financial exposure the employer bears without stop loss protection.

For a group with $500,000 in expected annual claims and a 125% aggregate attachment point, the corridor is $125,000. The employer is liable for claims between $500,000 and $625,000. For a $300,000 expected claims group (perhaps 15 lives), a 125% aggregate means the corridor is $75,000. At these group sizes, the corridor represents a significant portion of the employer’s annual benefits budget and, in some cases, a significant portion of the employer’s operating margin.

Whether the employer understands this exposure before purchasing is a question of broker disclosure quality. The aggregate attachment point is disclosed in the stop loss quote, but its financial significance is often not explained in operational terms. An employer may see “125% aggregate” and not translate that to “you are responsible for up to $125,000 in claims above expected before aggregate protection begins.” That translation requires converting a percentage into a dollar amount and then contextualizing that dollar amount against the employer’s financial capacity.

Some carriers offer aggregate attachment points below 125% for additional premium. An employer with low risk tolerance might purchase 115% aggregate for a narrower corridor, paying higher premium to reduce maximum exposure. Conversely, a cost-sensitive employer might accept 130% aggregate for lower premium, widening the corridor. These options are typically available for mid-market groups (25 to 50 lives) and are rarely presented to the smallest groups, who receive the carrier’s standard aggregate terms.

Lasers: What They Are and What They Do to Plan Economics

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A laser is a member-specific attachment point set higher than the standard specific attachment point. It is applied by the stop loss carrier to identified high-cost members based on known conditions: active cancer treatment, organ transplant candidacy, hemophilia, end-stage renal disease requiring dialysis, or other chronic conditions with predictable high-cost utilization.

The mechanics are direct. The group’s standard specific attachment point is $50,000. The carrier identifies a member with hemophilia whose expected annual factor replacement therapy costs are $350,000. The carrier lasers that member at $400,000. The plan retains the first $400,000 of that member’s claims. Stop loss reimburses only above $400,000. The standard $50,000 attachment point applies to every other member, but the lasered member has an individual threshold eight times higher.

Lasers appear at two points in the relationship. At initial placement, lasers may be applied if the health questionnaire or prescription data reveals a known high-cost condition. The employer sees the laser in the initial stop loss quote and can decide whether to bind the policy with the laser in place or seek alternative coverage. At renewal, lasers are more common because the carrier now has a full year of claims data revealing which members generated high costs. The renewal quote arrives with lasers already applied, typically 60 to 90 days before the policy year ends.

The economic impact on small groups is severe. For a 20-person group, one lasered member with $200,000 in expected annual claims fundamentally changes the plan’s financial profile. The employer’s total expected liability now includes the lasered member’s costs below the laser amount (which could be $200,000 or more) plus the standard retention for all other members. If the laser amount approximates or exceeds the member’s expected claims, the employer has effectively self-insured that member with no meaningful stop loss protection. The stop loss premium for the group may decrease because the carrier has excluded the high-cost risk, but the employer’s total financial exposure increases by the full amount of the laser.

For groups of 10 to 20 lives, a single laser can make the total cost of level funded exceed the fully insured alternative for a comparable group. The level funded economic advantage depends on the employer accessing stop loss protection at a cost below what the fully insured carrier charges for absorbing the same risk across its community-rated pool. When the carrier lasers the most expensive member, it removes the largest risk from the stop loss policy and returns it to the employer. The savings that level funded was supposed to produce may disappear.

The Disclosure Problem

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Timing of laser disclosure creates a structural disadvantage for the employer. At initial placement, lasers are disclosed in the stop loss quote. The employer can evaluate the laser’s impact and decide whether to proceed. At renewal, the laser arrives with the renewal offer, typically 60 to 90 days before the policy year ends. The employer has limited time to find alternative stop loss coverage if the laser is unacceptable, and finding alternative coverage for a group with a known high-cost member is difficult precisely because the condition that prompted the laser is visible to every carrier in the market.

The stop loss market moves slowly for small groups. Obtaining competitive quotes requires submitting census data, plan design information, and claims history to multiple carriers, a process that takes weeks. If the renewal quote arrives in October for a January plan year, the employer has approximately eight weeks to evaluate alternatives during a period when carriers and brokers are processing their full annual renewal books. The compressed timeline favors carrier retention: the employer accepts the laser because the alternatives are uncertain and the clock is running.

Member communication restrictions add an ethical dimension. Stop loss contracts typically prohibit disclosing to the lasered member that they have been lasered. The laser is a contract between the employer and the stop loss carrier. The member has no visibility into it and no recourse. The employer knows which member is lasered based on the carrier’s identification, but the member does not know that their health information is being used to modify the employer’s insurance arrangement. This information asymmetry has implications for how the employer makes plan design decisions, renewal decisions, and potentially employment decisions, even though using health information in employment decisions would violate federal law.

The broker’s role in laser disclosure varies dramatically. Some brokers present the stop loss renewal with detailed analysis of the laser’s financial impact: what the employer’s total cost looks like with the laser versus without, what alternative stop loss options exist, whether the employer should consider returning to fully insured for the lasered member’s plan year. Other brokers summarize the total premium without explaining what the laser means for employer risk exposure. The Consolidated Appropriations Act requires broker compensation disclosure, but it does not mandate a standard of advisory quality on stop loss terms. The quality of the broker’s explanation is a function of broker specialization, not regulatory requirement.

The laser mechanism is where the structural vulnerability of small group level funded is most visible. The employer accepted ERISA fiduciary responsibility when they established a self-funded plan. The stop loss carrier accepted risk when they underwrote the policy. The laser is the carrier’s mechanism for returning risk to the employer when the carrier’s underwriting assessment changes. For large groups, lasers are manageable: one high-cost member among 200 is a modest financial adjustment. For a 15-person group, one laser can restructure the plan’s entire economic proposition.