15.2 Guaranteed Issue, Rating Rules, and Marketplaces

Before the ACA, individual health insurers could decline applicants, exclude pre-existing conditions, and charge sick people far more. The ACA replaced medical underwriting in the individual and small-group markets with guaranteed issue and tightly limited rating factors. The exam tests these reforms as bright-line rules.

Guaranteed Issue and No Pre-Existing Exclusions

In the individual and small-group markets, insurers must accept every applicant who applies during an open or special enrollment period — this is guaranteed issue. Coverage may not be denied or rescinded because of health status, and pre-existing condition exclusions are prohibited entirely, including for children. A policy may be rescinded only for fraud or intentional misrepresentation, not for an honest application that later proves costly.

Modified Community Rating

The ACA forbids health-status rating. Premiums in the individual and small-group markets may vary based on only four factors:

Gender rating is prohibited — men and women of the same age pay the same base rate. Occupation, claims history, and health condition may not be used. If a question lists "medical history" or "gender" as an allowed factor, it is wrong.

Worked Example: Age Rating Band

If a 21-year-old's base premium is $300/month, the oldest adult (64+) may be charged no more than 3 times that amount, or $900/month, for the same plan in the same area before subsidies. A 60% tobacco surcharge is not permitted; the maximum tobacco load is 50%, so a smoker paying the $900 base could be charged up to $1,350. Knowing the 3:1 age band and 1.5:1 tobacco band lets you eliminate distractors quickly.

Enrollment Periods

Coverage is sold through defined windows, which the exam loves to test.

• Open Enrollment Period (OEP) — the annual window (federally, roughly November 1 to January 15) when anyone may enroll or change plans without a qualifying event.
• Special Enrollment Period (SEP) — a 60-day window triggered by a qualifying life event such as marriage, birth or adoption, loss of other coverage, or a permanent move. Voluntarily dropping coverage or non-payment does not trigger an SEP.

The Health Insurance Marketplace (Exchange)

The ACA created Marketplaces (Exchanges) — online platforms where individuals and small employers compare and buy qualified health plans (QHPs). States may run their own exchange or use the federal HealthCare.gov platform. Only plans purchased on the exchange can carry premium tax credits and cost-sharing reductions; the same carrier may sell similar plans off-exchange, but those forfeit subsidies. The SHOP (Small Business Health Options Program) is the small-employer counterpart. The exam's key takeaway: subsidies follow on-exchange enrollment, not the insurer.

Guaranteed Renewability

ACA-compliant individual and small-group coverage is guaranteed renewable: as long as the policyholder pays premiums, the insurer must renew the policy and cannot cancel it because the member became sick or filed claims. An insurer may non-renew an entire product line or exit a market, but only with advance notice and on a uniform basis — never to single out an unhealthy individual. This pairs with guaranteed issue to ensure that coverage, once obtained, persists.

Medical Loss Ratio (MLR)

The ACA requires insurers to spend a minimum share of premium dollars on medical care and quality improvement rather than administration and profit. The medical loss ratio floor is 80% in the individual and small-group markets and 85% in the large-group market. Carriers that fall short must issue rebates to policyholders. The exam tests the 80/85 split and the concept that excess overhead triggers consumer rebates.

Summary of Benefits and Coverage (SBC)

To help consumers compare plans, the ACA mandates a standardized Summary of Benefits and Coverage — a short, plain-language document using uniform definitions and coverage examples (such as the cost of having a baby or managing diabetes). Insurers must provide the SBC at application, enrollment, and renewal, and within seven business days of a request. The standardized format is the point: it lets a shopper compare two plans on identical terms, supporting the metal-tier framework from 15.1.

Worked Example: Benchmark and Off-Exchange

Consider two identical Silver plans from the same carrier. The on-exchange version qualifies the enrollee for an $4,800 annual premium tax credit; the off-exchange version, though priced the same before subsidy, qualifies for nothing. An enrollee earning a subsidy-eligible income who buys off-exchange therefore pays the full premium out of pocket — a costly mistake the exam likes to test. The lesson: subsidies follow on-exchange enrollment, so a subsidy-eligible client should almost always buy through the Marketplace.

Individual Coverage and the Mandate

The ACA originally imposed an individual shared-responsibility mandate with a tax penalty for going uninsured. The federal penalty was reduced to $0 beginning in 2019, so at the federal level there is no longer a monetary penalty for lacking coverage, though guaranteed issue and the rating reforms remain fully in force. Some states have enacted their own coverage mandates. The exam point: federal guaranteed issue did not disappear when the federal penalty went to zero.