12.1 Group Health Fundamentals and Eligibility

Group health insurance covers a defined group of people, most often the employees of a single employer, under one contract. The exam tests how group coverage differs structurally from individual coverage, who qualifies, and which rules exist to stop only sick people from enrolling.

The Master Policy and Certificates

The insurer issues one master policy to the employer, who is the policyholder. Each covered employee receives a certificate of insurance that summarizes benefits, exclusions, and claim procedures.

A common trap: if a benefit in the certificate conflicts with the master policy, the master policy controls, because it is the contract. Employees are the insureds, not policyholders.

Group vs. Individual Underwriting

Group underwriting evaluates the group as a whole, examining its size, industry hazard, age and gender mix, geography, and prior claims experience. It does not normally require individual medical exams.

Eligibility and Waiting Periods

To be eligible, a person must usually be a full-time employee (30+ hours/week under the ACA) in an eligible class. Two timing rules matter:

• Probationary (waiting) period - a delay (commonly 0-90 days; ACA caps it at 90) before a new hire may enroll.
• Eligibility/enrollment period - the window (often 31 days) to elect coverage after becoming eligible; missing it may require waiting for open enrollment or proving insurability.

The Actively-at-Work Provision

The actively-at-work provision requires the employee to be performing normal job duties on the date coverage takes effect. If the employee is home sick on the effective date, coverage may be deferred until they return to work. This prevents someone from enrolling specifically because they are already disabled.

Eligible Dependents

Under the ACA, plans offering dependent coverage must extend it to children up to age 26, regardless of student status, marital status, or financial dependency. A spouse is typically eligible; in many states a domestic partner may be added.

Exam trap: a 24-year-old, married, non-student child is STILL an eligible dependent under the federal age-26 rule.

Open Enrollment vs. Special Enrollment

Group plans set an annual open enrollment window during which any eligible employee may join or change elections without proving insurability. Outside that window, coverage changes require a special enrollment period triggered by a qualifying life event.

Without a qualifying event, an employee who declined coverage and later wants in must wait for open enrollment. This rule, like the participation thresholds, exists to stop employees from waiting until they are sick to enroll.

Classes of Eligible Employees

An employer may define eligible classes by objective, non-discriminatory criteria such as full-time status, job category, or length of service. It may NOT define classes to favor only healthy or highly compensated individuals, because HIPAA bars eligibility rules based on health status. A part-time worker below the hours threshold is simply not in an eligible class, which is different from being declined for health reasons.

Coordination of Benefits Preview

When a person is covered by more than one group plan, a coordination of benefits (COB) provision decides which plan pays first (the primary plan) and which pays the balance (the secondary plan). For an employee, their own employer's plan is primary.

For a dependent child covered under both parents, the birthday rule makes primary the plan of the parent whose birthday falls earlier in the calendar year. The combined payment never exceeds 100% of the allowable charge, so COB prevents over-insurance and duplicate recovery.

Eligibility, Enrollment Periods, and the Master Contract

Group health is issued under a master contract to the employer; employees receive a certificate of coverage. To be eligible an employee generally must be full-time and actively at work and have satisfied any probationary period (commonly up to 90 days under the ACA limit). Enrollment is restricted to defined windows:

• Initial enrollment period — when first eligible.
• Open enrollment — an annual window to join or change plans without evidence of insurability.
• Special enrollment — triggered by qualifying life events (marriage, birth, loss of other coverage), typically within 30 days.

Exam trap: An employee who declines coverage at initial eligibility and has no qualifying event generally must wait for open enrollment and may face evidence of insurability as a late entrant — the mechanism that controls adverse selection in contributory plans.

Why Group Underwriting Differs

Group coverage underwrites the group as a unit, not each person, so most enrollees obtain coverage with no individual medical exam up to a guaranteed-issue limit. The insurer evaluates the group's size, industry, claims experience, and demographics. This pooling is exactly why group coverage is cheaper and more accessible than individual coverage — and why minimum participation rules exist to keep the pool from filling only with high-risk members.