12.1 Group Health Fundamentals and Eligibility

Group health insurance covers a defined collection of people, most commonly the employees of a single employer, under one contract. The exam tests the structural difference between group and individual coverage relentlessly, so anchor on this: the employer is the policyholder and signs the master contract (also called the master policy), while each covered employee is an insured who receives a certificate of insurance. The certificate summarizes benefits and proves coverage, but it is NOT the contract. When a benefit dispute arises, the master contract controls.

Master Contract vs. Certificate

Because one contract covers many lives, group rates are experience-rated for large groups (priced on the group's own claims history) or community-rated for small groups (priced on a pooled regional average). Group premiums are usually lower per person than individual coverage because acquisition and administration costs are spread across many insureds and adverse selection is controlled by eligibility design rather than individual medical underwriting.

Eligibility and the Principal Purpose Rule

A group must exist for a reason other than obtaining insurance. This is the principal-purpose rule, and it exists to prevent anti-selection — a group assembled just to buy cheap coverage would attract the sickest applicants. Acceptable groups include single-employer groups, multiple-employer trusts (METs), labor unions (Taft-Hartley trusts), trade associations, and creditor-debtor groups.

Eligibility Conditions for an Employee

• Full-time, active employment — typically defined as 30+ hours per week; part-time and seasonal workers are usually excluded.
• Probationary (waiting) period — a delay (commonly 30, 60, or 90 days) between hire and benefit eligibility. The ACA caps employer waiting periods at 90 days.
• Eligibility period — the window (often 31 days) after the waiting period during which a new eligible employee may enroll without evidence of insurability.

An employee who declines during the eligibility (enrollment) period becomes a late enrollee and may have to provide evidence of insurability or wait for the next open enrollment, depending on plan and ACA rules. Dependents — a legal spouse and children up to age 26 under the ACA — may also be enrolled.

Enrollment Periods and a Worked Timeline

Think of the new-hire path as a sequence:

1. Date of hire — clock starts.
2. Waiting period — e.g., 90 days; no coverage yet.
3. Eligibility period — e.g., 31 days after the waiting period; employee enrolls with no medical questions (guaranteed issue).
4. Coverage effective — first of the month following enrollment, per the master contract.

Worked example: Maria is hired March 1 with a 60-day waiting period and a 31-day eligibility period. She becomes eligible April 30. She must elect coverage by May 31 to avoid late-enrollee status. If she enrolls May 10, coverage typically begins June 1.

Open enrollment is the recurring annual window (often two to four weeks) when current employees may add, drop, or change coverage. Outside open enrollment, a qualifying life event (marriage, birth, loss of other coverage) opens a special enrollment period, usually 30 to 60 days. The exam loves the trap that late enrollees can be required to show evidence of insurability, whereas timely new-hire and special-enrollment elections cannot.

The master contract, certificates, and experience rating

Group health is built on a master contract (master policy) issued to the group sponsor (usually the employer), who is the policyowner. Individual members do not receive a policy; they receive a certificate of coverage summarizing their benefits and rights — but the master contract is the legally enforceable document, a frequently tested distinction. Because the insurer underwrites the group as a whole, individual members generally need no evidence of insurability when enrolling on time, which makes group coverage broader and cheaper than individual coverage.

Larger groups are experience-rated (premiums reflect the group's own claims history), while small groups are community-rated (premiums reflect a broader pool). Late enrollees who miss their initial window may face evidence-of-insurability requirements, a safeguard against the adverse selection that would otherwise destabilize the pool.

Eligibility, probationary periods, and dependents

To be eligible, a member must usually be a full-time active employee who has satisfied any probationary (waiting) period (commonly 30–90 days from hire). After the waiting period the employee gets an enrollment period (often 31 days) to elect coverage; enrolling on time secures guaranteed acceptance. The principal-purpose rule requires that the group exist for a reason other than buying insurance — an employer, union, or trade association qualifies, but a group formed solely to obtain coverage does not.

Dependent eligibility extends to a spouse and children up to the limiting age (26 under ACA-compliant plans), and a special enrollment period is triggered by life events such as marriage, birth, or loss of other coverage. Missing the regular window without a qualifying event can force the employee to wait for open enrollment and may require proof of insurability.