15.2 Guaranteed Issue, Rating Rules, and Marketplaces

Before the ACA, insurers in most states could medically underwrite individual health applicants — deny coverage, exclude pre-existing conditions, or charge whatever a person's health justified. The ACA replaced that with guaranteed issue, modified community rating, and a marketplace where standardized Qualified Health Plans (QHPs) are sold. This section covers the rules that govern who can buy, what they can be charged, and where coverage is purchased.

Guaranteed Issue and Renewability

Guaranteed issue means an insurer must accept every eligible applicant regardless of health status — no medical underwriting, no declination, and no pre-existing-condition exclusions. Guaranteed renewability means the insurer cannot cancel or refuse to renew because the insured got sick; non-renewal is allowed only for narrow reasons such as nonpayment of premium or fraud.

Before the ACA, only a handful of states guaranteed issue in the individual market. The ACA made it federal law nationwide.

Guaranteed issue paired with a prohibition on pre-existing condition exclusions is the heart of the consumer-protection package. Under prior law, an insurer could attach an exclusionary rider — refusing to pay for treatment connected to a condition the applicant already had — or impose a waiting period before that condition was covered.

The ACA bans both: coverage for a pre-existing condition begins immediately, on the same terms as any other covered illness. This is why enrollment timing is controlled instead; with no health screen at the door, limiting when people can buy keeps healthy and sick risks balanced in the pool.

Modified Community Rating

The ACA bans health-status rating. An insurer may vary the individual/small-group premium using only four factors:

Prohibited factors include health status, medical history, gender, claims experience, occupation, and genetic information. Two common traps: gender cannot be used at all (a 30-year-old woman and man pay the same base rate), and the age band is capped at 3:1 — the oldest adult can be charged at most three times the youngest adult's rate, not more.

Worked rating example

A carrier sets a base individual premium of $300/month for a 21-year-old non-smoker in a rating area. The maximum it may charge an older adult under the 3:1 band is $300 x 3 = $900/month. If that older adult also uses tobacco, the carrier may apply the tobacco load up to 1.5:1 on top: $900 x 1.5 = $1,350/month maximum. It may not add a dime for the person's diabetes or claims history — those are prohibited.

A subtle point: the tobacco surcharge is the one rating factor a premium tax credit does not offset. PTCs are calculated against the non-tobacco benchmark, so a tobacco user pays the full surcharge out of pocket. Geographic rating means two identical 40-year-olds in different parts of a state can owe different premiums simply because medical costs differ by area — this is permitted and not discriminatory under the rules.

The Health Insurance Marketplace

The Marketplace (Exchange) is the platform where individuals and small businesses shop for QHPs and where premium tax credits and cost-sharing reductions are available — subsidies can only be claimed through the Marketplace, not for off-exchange plans.

The same ACA protections and subsidy rules apply whether the state runs its own exchange or uses the federal platform.

Open and Special Enrollment

Individual coverage is sold during the annual Open Enrollment Period; outside that window a consumer needs a qualifying life event to trigger a 60-day Special Enrollment Period (SEP) — examples include marriage, birth or adoption, loss of other coverage, or a permanent move. Routinely getting sick is not a qualifying event; that is exactly what guaranteed issue plus limited enrollment windows is designed to balance against adverse selection.

Qualified Health Plans

A QHP is a Marketplace-certified plan that covers all ten EHBs, follows the metal-level framework, honors the OOP maximum, and maintains an adequate provider network. Only QHPs purchased on the Marketplace are subsidy-eligible.

Dependent coverage and the SHOP

Two more ACA mandates round out the individual-market rules. First, plans that offer dependent coverage must extend it to an adult child up to age 26, regardless of the child's marital status, residence, financial dependency, or student status.

Second, small employers buy through the SHOP (Small Business Health Options Program) marketplace; a related small-business health-care tax credit can offset premiums for qualifying employers with fewer than 25 full-time-equivalent employees and modest average wages who contribute toward coverage. An agent advising a small employer should distinguish the individual Marketplace from SHOP — they are separate enrollment channels with different rules.