15.2 Guaranteed Issue, Rating Rules, and Marketplaces

Guaranteed Issue and Guaranteed Renewability

Guaranteed issue means an insurer must accept every eligible applicant for individual or group health coverage regardless of health status, claims history, or preexisting conditions. The insurer cannot decline an application, attach a rider excluding a condition, or delay coverage for a sick applicant.

Closely related is guaranteed renewability: once issued, the policy must be renewed at the policyholder's option. An insurer may non-renew only for narrow reasons — nonpayment of premium, fraud or material misrepresentation, or the insurer exiting the market entirely.

Preexisting Conditions

The ACA prohibits preexisting-condition exclusions in all non-grandfathered plans. A diabetic applying for individual coverage cannot be charged more, excluded, or denied. This is the single largest change from the pre-2014 individual market, where medical underwriting was the norm.

Exam trap: Guaranteed issue does not mean coverage starts whenever the applicant wishes. Outside of a special enrollment period, an applicant must still wait for open enrollment. Guaranteed issue removes the medical barrier, not the timing rules.

Guaranteed issue is the mechanism that necessarily pairs with the ACA's other consumer protections. Once an insurer cannot decline a sick applicant or charge that person more, it must spread risk across a broad pool. That is precisely why the law also controls enrollment timing and once relied on the individual mandate: without timing limits, consumers could rationally wait until illness struck, leaving only sick people in the pool and driving premiums upward — the dynamic known as adverse selection.

Modified Community Rating (the Four Allowed Factors)

ACA-compliant individual and small-group premiums use modified community rating. The premium may vary on only four factors:

Prohibited rating factors include health status, medical history, gender, claims experience, and occupation. A 64-year-old non-smoker may be charged no more than three times the premium of a 21-year-old non-smoker in the same area for the same plan.

Worked example: A 21-year-old's base premium for a Silver plan is $300/month. The maximum ACA age-rated premium for a 64-year-old (non-tobacco) on the same plan in the same area is 3 x $300 = $900/month. If that older applicant uses tobacco, the carrier may apply up to a further 1.5x surcharge: $900 x 1.5 = $1,350/month.

Enrollment Windows

Because coverage is guaranteed issue, the ACA controls when people may buy to prevent consumers from waiting until they are sick.

• Open Enrollment Period (OEP): the annual window when anyone can enroll in or change individual coverage. The federal OEP generally runs from November 1 through mid-January.
• Special Enrollment Period (SEP): a 60-day window triggered by a qualifying life event (QLE) such as marriage, birth or adoption, loss of other coverage, or a permanent move.

Group and Medicaid enrollment differ: Medicaid has no fixed enrollment window — eligible people may enroll year-round.

Exam trap: Losing coverage because you stopped paying your premium (voluntary loss) is generally not a qualifying event. Involuntary loss — such as losing job-based coverage or aging off a parent's plan at 26 — does trigger an SEP.

Producers should counsel clients to act promptly: the 60-day SEP clock typically runs from the date of the qualifying event, and missing it can leave a client uninsured until the next open enrollment. Documentation of the event — a termination letter, marriage certificate, or proof of move — is often required to activate the SEP and avoid a coverage gap.

The Health Insurance Marketplace (Exchange)

The Marketplace is the structured platform where consumers compare qualified health plans by metal level, price, and network, and where they apply for premium tax credits and cost-sharing reductions. Subsidies are available only through the Marketplace.

Three Marketplace Models

The SHOP (Small Business Health Options Program) is the parallel Marketplace for small employers.

Medical Loss Ratio (MLR)

The MLR rule requires insurers to spend a minimum share of premium dollars on medical care and quality improvement rather than administration and profit:

• 80% for individual and small-group plans (the 80/20 rule).
• 85% for large-group plans.

If an insurer falls below the threshold, it must issue rebates to policyholders.

Worked example: A small-group insurer collects $10,000,000 in premium and spends $7,500,000 (75%) on claims and quality. The 80% minimum required $8,000,000, so the insurer must rebate the $500,000 shortfall to its enrollees.

The MLR rule is a market-conduct guardrail that producers should be able to explain: it caps the share of premium an insurer can keep for administration, marketing, agent commissions, and profit. Rebates are typically issued each summer based on the prior year's experience and may be paid as a check, a premium credit, or a refund to the employer for group coverage. The rule does not guarantee any individual a refund — it is measured at the aggregate market level within each state.