12.2 Group Underwriting and Contribution/Participation

Group Underwriting and Contribution/Participation

Group underwriting evaluates the group as a whole, not each individual. Underwriters analyze the average age, gender mix, occupation/industry hazard, group size, prior claims (loss) experience, and the stability of the group (turnover). The goal is a homogeneous, stable risk pool large enough that claims become statistically predictable—the law of large numbers at work.

Two financing rules exist to keep that pool healthy and prevent adverse selection: contribution requirements and participation requirements. The exam tests these constantly, often together, so internalize the difference.

Contributory vs. noncontributory plans

The distinction is who pays the premium:

In a noncontributory plan the employer pays the entire premium, so insurers require 100% of eligible employees to be covered—nobody can opt out, which eliminates adverse selection entirely. In a contributory plan employees pay part of the premium, and insurers commonly require at least 75% participation so the pool stays broad.

Why participation requirements exist

If only sick employees enrolled and healthy ones opted out, claims per covered life would spike—classic adverse selection. The participation floor forces enough healthy lives into the pool to keep rates stable.

Worked example: An employer has 100 eligible employees on a contributory plan requiring 75% participation. To remain eligible for group rates, at least 75 employees must enroll. If only 60 enroll, the insurer may decline the case or re-rate it because the pool is too thin and skewed toward higher-risk lives.

Counting eligible employees correctly

Participation percentages apply to eligible employees, not the total headcount. Employees who decline because they have other coverage (a spouse's plan, Medicare, or military TRICARE) are often excluded from the denominator, because their decline is not adverse selection—they simply have coverage elsewhere.

Worked numeric: A firm has 100 employees; 20 have valid other coverage and waive in writing. The eligible base becomes 80, and at 75% participation the carrier needs 60 of the remaining 80 to enroll. Misreading the denominator is a deliberate exam trap—read for documented waivers.

Contributory vs. Non-Contributory

The participation requirement exists to spread risk and block adverse selection. If too few healthy employees enroll, the pool skews sick. Non-contributory plans require everyone because there is no reason to opt out; contributory plans typically require a high percentage (often 75%) to keep rates stable.

Worked Example: A 100-employee firm offers a contributory plan needing 75% participation. Only 60 enroll — the insurer can refuse to issue or re-rate the group, because the 40 who declined are likely the healthiest, leaving a costlier risk pool.

Experience vs. Community Rating

Experience rating sets the group's premium from its own claims history — large employers are rated this way, rewarding healthy groups. Community rating charges all groups in an area the same base rate regardless of individual claims; ACA small-group and individual markets use a modified community rating that bars health-based pricing.

Exam Distinction: Large groups → experience rated (own claims drive price). Small groups/individual under ACA → community rated (price varies only by age, geography, tobacco, family size — never health). Group health is annually renewable and rated as a unit, so one member's claims do not single them out for a rate-up.

Rating methods

Two approaches set group premiums:

• Community rating — everyone in a geographic area or pool pays the same base rate regardless of the group's own claims. The ACA largely mandates adjusted community rating for small groups, allowing variation only for age, geography, tobacco use, and family size—not health status.
• Experience rating — larger groups are priced on their own claims history. A group with low claims earns lower renewal rates; a high-claim group is re-rated upward.

Exam trap: ACA bans rating based on health status, gender, or claims history for small groups and individuals; only the four permitted factors apply.

Conversion and continuation at the underwriting boundary

When an employee leaves a group, group underwriting protections end. Many group health plans include a conversion privilege: the departing insured may convert to an individual policy without evidence of insurability, provided they apply within a stated window (commonly 31 days). The converted policy is individually rated and usually costs more, but it guarantees access for someone who might otherwise be uninsurable.

Distinguish conversion (a new individual contract) from continuation under COBRA (staying on the group plan temporarily), covered in the next section.

Minimum group size and gender/age factors

Most states set a minimum group size (often 2-10 lives) before true group underwriting applies; below that, carriers use simplified or modified individual underwriting. As the group grows, individual evidence of insurability becomes less important because the law of large numbers smooths claims.

Underwriters also watch the demographic profile. An aging workforce or a high-hazard industry (roofing, mining) raises expected claims and premium. Under ACA small-group rules, age can vary rates within a 3:1 band (oldest adult no more than three times the youngest), and tobacco use may add up to a 1.5:1 surcharge—but gender and health status may not be used.

Re-rating, renewal, and the persistency incentive

On renewal, an experience-rated group's claims are compared to expected claims. A loss ratio well below target may earn a rate reduction or an experience refund; a high loss ratio triggers an upward re-rate. Carriers reward persistency (low turnover, long tenure) because stable groups have predictable claims and lower acquisition costs.

Worked numeric: A group's annual premium is $500,000 and incurred claims are $350,000, a 70% loss ratio against a 75% target. The favorable experience may support a renewal credit, whereas claims of $450,000 (90% loss ratio) would justify a rate increase at renewal.