15.2 Guaranteed Issue, Rating Rules, and Marketplaces

Guaranteed issue and no preexisting-condition exclusions

In the ACA individual and small-group markets, coverage is guaranteed issue: an insurer must accept any eligible applicant during an open or special enrollment period and cannot decline, delay, or surcharge based on health status. There is no medical underwriting for health status, and preexisting-condition exclusions are prohibited for all ages.

This is a major shift from pre-ACA individual health insurance, where carriers could decline applicants, exclude conditions, or rider out a body system. On the exam, watch for the distinction between health-status underwriting (banned) and the few permitted rating factors (allowed). A carrier may still verify eligibility (residency, citizenship/lawful presence, age) and may rate on the limited factors below — but it cannot ask health questions to set the premium of an individual-market ACA plan.

Permitted rating factors

For ACA-compliant individual and small-group plans, premiums may vary only by four factors:

Gender, occupation, individual health status, and claims history are not permitted rating factors. The 3:1 age band means a 64-year-old's base premium can be at most three times a 21-year-old's in the same area. The tobacco surcharge stacks on top of age but is capped at 1.5x.

Worked example: if a 21-year-old's base rate in a region is $300, the 3:1 band caps a 64-year-old at $900 before other factors. Add the 1.5:1 tobacco surcharge and that 64-year-old smoker's premium could reach $1,350. Trap: the tobacco surcharge is allowed in many states, but premium tax credits are calculated on the non-tobacco premium, so the smoker pays the full surcharge out of pocket and cannot subsidize it away. Some states (and the District of Columbia) ban or compress the tobacco surcharge entirely, so always confirm the state rule rather than assuming the federal maximum applies.

Enrollment periods and dependent coverage

Consumers buy or change ACA individual coverage during the annual open enrollment period (OEP). Outside the OEP, a person needs a qualifying life event to trigger a special enrollment period (SEP) — typically a 60-day window.

Qualifying life events include:

• Loss of other minimum essential coverage (job loss, aging off a parent's plan, divorce)
• Marriage, birth, adoption, or placement for adoption
• Permanent move to a new coverage area
• Change in income or status affecting subsidy eligibility

The ACA also requires plans that offer dependent coverage to let children stay on a parent's plan until age 26, regardless of whether the child is married, a student, living at home, or financially dependent. Trap: voluntarily dropping coverage or failing to pay premiums is not a qualifying event for a new SEP.

Marketplaces (Exchanges) and metal-level display

The ACA created Health Insurance Marketplaces (also called Exchanges) where individuals and small employers compare and buy qualified health plans (QHPs). A state may run its own marketplace, use the federal platform, or partner. The marketplace is the only place a consumer can claim advance premium tax credits (APTC) and cost-sharing reductions (CSR) — subsidies are not available on plans bought directly off-exchange.

Key marketplace mechanics:

• Plans are displayed by metal level so consumers can compare actuarial value at a glance.
• The marketplace verifies eligibility for subsidies based on projected household income and access to other coverage.
• A consumer can buy a non-subsidized QHP off-exchange, but loses access to APTC/CSR by doing so.

For a producer, the takeaway is that subsidy-eligible clients must enroll through the marketplace to capture the credit, even if an identical plan exists off-exchange.

Medical loss ratio (MLR) and consumer rebates

The ACA's medical loss ratio (MLR) rule forces insurers to spend a minimum share of premium dollars on medical care and quality improvement rather than administration, marketing, and profit:

• 80% for individual and small-group plans
• 85% for large-group plans

If an insurer's MLR falls below the threshold, it must issue rebates to policyholders for the difference. Worked example: an individual-market insurer collects $10,000,000 in premium but spends only $7,600,000 (76%) on claims and quality improvement. The 80% minimum required $8,000,000, so the insurer is $400,000 short and must rebate that $400,000 to enrollees. MLR is a back-end consumer protection that complements front-end rate review.

Guaranteed Issue, Allowed Rating Factors, and Enrollment Periods

The ACA reshaped individual-market underwriting, and the exam tests the new rules against the old. Coverage is now guaranteed issue, so insurers must accept every applicant regardless of health, and preexisting-condition exclusions are prohibited. Insurers may vary premiums on only a short list of factors: age (limited to a 3-to-1 ratio between oldest and youngest adults), geographic rating area, tobacco use (up to a 1.5-to-1 surcharge), and whether the policy covers an individual or a family. Crucially, gender and health status may no longer be used, a direct reversal of pre-ACA practice that the exam highlights.

Guaranteed issue without enrollment limits would invite people to wait until sick to buy, so the ACA channels enrollment through windows. The annual Open Enrollment Period is the main chance to buy or change a marketplace plan. Outside it, a Special Enrollment Period of typically 60 days opens only after a qualifying life event such as marriage, birth or adoption, loss of other minimum essential coverage, or a permanent move.

Work a scenario: a healthy person who skips Open Enrollment and then tries to buy a plan mid-year after a minor illness has no qualifying event and must wait, which is the adverse-selection guard that makes guaranteed issue sustainable. Plans are sold both on the federal or state Marketplace, where subsidies are available, and off-exchange directly from insurers, where the same rating rules apply but no premium tax credit can be claimed.

The medical loss ratio backstop, requiring 80% of individual and small-group premium (85% for large group) to go to claims and quality with rebates for shortfalls, complements front-end rate review to keep premiums fair.