15.2 Guaranteed Issue, Rating Rules, and Marketplaces
Key Takeaways
- Guaranteed issue requires ACA-compliant individual and small-group insurers to accept all applicants regardless of health, with no pre-existing condition exclusions.
- Premiums in the individual and small-group markets may vary only by four factors: age (max 3:1), tobacco use (max 1.5:1), geographic rating area, and individual versus family enrollment.
- Health status, gender, claims history, and occupation may NOT be used to set ACA-compliant premiums (community rating).
- Open enrollment is the annual window to enroll or change Marketplace plans; a qualifying life event triggers a special enrollment period (typically 60 days).
- Dependents may remain on a parent's plan until age 26, regardless of marital, student, financial, or residency status.
Guaranteed issue and pre-existing conditions
Under the ACA, individual and small-group health insurers offering ACA-compliant coverage must use guaranteed issue: they must accept every applicant who applies during an enrollment period, regardless of health status. They may not decline an applicant, charge more, or exclude coverage because of a pre-existing condition.
This reversed the pre-ACA individual market, where carriers used medical underwriting, declined high-risk applicants, and imposed pre-existing condition waiting periods. The tested vocabulary:
- Guaranteed issue — must accept all applicants in an enrollment window.
- No pre-existing condition exclusions — a condition that existed before coverage began cannot be excluded or subject to a waiting period.
- Guaranteed renewability — the insurer must renew the policy as long as premiums are paid, except for fraud or nonpayment.
A trap: guaranteed issue does not mean anyone can enroll at any time. Enrollment is restricted to open enrollment or a special enrollment period — see below.
Modified community rating — the four factors
ACA-compliant individual and small-group premiums use modified community rating. Only four rating factors are permitted:
| Permitted factor | Limit |
|---|---|
| Age | Maximum 3:1 (oldest adult ≤ 3× youngest adult) |
| Tobacco use | Maximum 1.5:1 |
| Geographic rating area | No fixed ratio; based on region |
| Individual vs. family (tier/composition) | Reflects who is covered |
Factors that may NOT be used: health status, medical history, claims experience, gender, occupation, and industry. Charging women more than men for the same plan (gender rating) is prohibited.
Worked numeric — age and tobacco
A 64-year-old non-smoker pays a base premium of $900. The youngest adult on the same plan could be charged no less than $900 ÷ 3 = $300, because age variation is capped at 3:1. If that 64-year-old uses tobacco, the carrier may add up to a 1.5:1 tobacco load: $900 × 1.5 = $1,350 maximum. Note the tobacco surcharge applies after the age factor and is not offset by premium tax credits.
Which of the following may an ACA-compliant individual health insurer legally use to set premiums?
Enrollment periods
Because coverage is guaranteed issue, the ACA controls when people may enroll to prevent applicants from waiting until they are sick.
- Open enrollment — an annual window (set by federal/state rule) when anyone may enroll in or change a Marketplace plan.
- Special enrollment period (SEP) — triggered by a qualifying life event (QLE), generally giving the person 60 days to enroll. QLEs include loss of other coverage (job loss, aging off a parent's plan), marriage, divorce, birth or adoption of a child, a permanent move, and certain income or citizenship changes.
Losing coverage because you failed to pay premium or voluntarily dropped coverage is usually not a qualifying event. Outside these windows, an applicant generally cannot buy ACA-compliant individual coverage.
Dependents to age 26
A plan offering dependent coverage must allow children to stay on a parent's plan until age 26. This applies regardless of whether the child is married, a student, employed, financially independent, or living with the parent — a heavily tested set of distractors. The adult child's own spouse and children are not required to be covered under this rule.
The Health Insurance Marketplaces (Exchanges)
The Health Insurance Marketplace (also called the Exchange) is where individuals shop for, compare, and buy ACA-compliant individual coverage, and the only place to claim premium tax credits and cost-sharing reductions. There are state-based Marketplaces and the federal Marketplace (HealthCare.gov) serving states without their own.
Key Marketplace facts:
- Plans are displayed by metal level (Bronze, Silver, Gold, Platinum) so consumers can compare equivalent actuarial value across carriers.
- Premium tax credit (PTC) subsidies and cost-sharing reductions (CSRs) are available only on Marketplace plans, never off-exchange.
- A SHOP (Small Business Health Options Program) Marketplace serves small employers separately from the individual Marketplace.
- The same metal-level plan bought off-exchange is ACA-compliant and guaranteed issue, but it cannot receive subsidies.
The exam's core distinction: ACA-compliant rules (guaranteed issue, EHBs, rating limits, no dollar limits) apply on and off the Marketplace, but the financial assistance (PTC and CSR, covered in 15.3) exists only inside the Marketplace.
Minimum essential coverage and the individual mandate
The ACA defined minimum essential coverage (MEC) — the kinds of coverage that satisfy the law, including most employer plans, individual ACA plans, Medicare, Medicaid, CHIP, and TRICARE. Short-term limited-duration plans and excepted benefits (stand-alone dental, vision, accident, critical illness) are not MEC.
The federal individual shared-responsibility penalty for going without MEC was reduced to $0 beginning in 2019, so there is no longer a federal tax penalty, though some states impose their own mandate. Producers should still steer clients to MEC because non-MEC products leave gaps in EHB protection and do not stop a future pre-existing condition problem.
A 24-year-old who is married, employed full-time, and living independently asks whether she can stay on her father's employer health plan. What is correct?
The Four Rating Factors and a Guaranteed-Issue Enrollment Worked Example
The ACA's market reforms rest on guaranteed issue paired with limited modified community rating, and the exam tests exactly which factors an insurer may still use to price coverage. Only four factors are permitted; everything else — notably health status and gender — is barred.
| Permitted rating factor | Limit |
|---|---|
| Age | No more than a 3:1 ratio (oldest to youngest adult) |
| Tobacco use | No more than a 1.5:1 surcharge |
| Geographic region | By rating area |
| Family size / tier | Individual vs. family composition |
The reforms link tightly: because insurers must guarantee issue (accept all applicants regardless of health) and cannot rate by health status or gender, the system needs broad enrollment to avoid a death spiral. Pre-existing condition exclusions are prohibited entirely on major-medical plans. The trade-off is limited enrollment windows — guaranteed issue is available during the annual Open Enrollment Period or a Special Enrollment Period triggered by a qualifying life event (marriage, birth, loss of other coverage, a move), not at any time the consumer wishes.
Worked enrollment example: a healthy 28-year-old who skipped Open Enrollment cannot simply buy a plan in July merely because she now wants coverage — that would let people wait until sick, undermining the guaranteed-issue pool. She must wait for the next Open Enrollment unless a qualifying event opens a 60-day Special Enrollment Period; losing job-based coverage in July would qualify, letting her enroll within 60 days.
Worked rating example: an insurer may charge a 64-year-old up to 3 times the premium of a 21-year-old for the same plan (the 3:1 age band) and add up to a 50% tobacco surcharge, but it may not charge a woman more than a man or surcharge a diabetic — health and gender are off the table.