15.2 Guaranteed Issue, Rating Rules, and Marketplaces
Key Takeaways
- Non-grandfathered individual/small-group plans are guaranteed issue and guaranteed renewable, with no pre-existing-condition exclusions.
- Individual-market enrollment is limited to annual Open Enrollment or a Special Enrollment Period after a qualifying life event.
- Modified community rating allows only four factors: family tier, geography, age (3:1 max), and tobacco (1.5:1 max).
- Gender, occupation, claims history, and health status are prohibited rating factors.
- Premium tax credits and cost-sharing reductions are available only through the Marketplace (Exchange).
Guaranteed Issue and Renewability
The ACA transformed individual-market underwriting. Non-grandfathered individual and small-group plans must be offered on a guaranteed-issue basis: an insurer cannot decline an applicant, charge more, or exclude coverage because of pre-existing conditions or health status. Coverage is also guaranteed renewable — the insurer must renew so long as premiums are paid, regardless of claims experience.
Because coverage is always available, enrollment in the individual market is generally limited to an annual Open Enrollment Period or a Special Enrollment Period (SEP) triggered by a qualifying life event (loss of other coverage, marriage, birth/adoption, permanent move). Without these windows, guaranteed issue would invite adverse selection — people buying only when sick.
Modified Community Rating: Only Four Factors
The ACA permits modified community rating. Premiums may vary on only four factors; everything else (gender, occupation, claims history, health status) is prohibited.
| Allowed factor | Maximum variation |
|---|---|
| Individual vs. family (plan tier) | Per family composition |
| Geographic rating area | By state-defined region |
| Age (adults) | No more than 3:1 |
| Tobacco use | No more than 1.5:1 |
The 3:1 rule: the oldest adult cannot be charged more than three times the youngest adult's rate. Tobacco 1.5:1: a tobacco user's premium cannot exceed 1.5 times a non-user's. Note premium tax credits are calculated before the tobacco surcharge, so the surcharge is borne fully by the smoker.
Worked Rating Example
A 21-year-old non-tobacco base rate in a region is $300/month.
- Maximum age-rated adult premium (3:1): $300 × 3 = $900/month for the oldest adult.
- A 55-year-old non-smoker rated at $620; if that person uses tobacco, the surcharge can be up to 1.5×: $620 × 1.5 = $930/month.
- The tobacco surcharge ($310 here) is added after any premium tax credit is applied, so the credit never offsets the smoker penalty.
Trap: candidates confuse the two ratios. Age is 3:1, tobacco is 1.5:1. Gender rating is fully prohibited — a common distractor.
The Health Insurance Marketplace (Exchange)
The ACA created Marketplaces (Exchanges) where consumers compare and buy Qualified Health Plans (QHPs). A QHP must be certified by the Exchange, cover EHBs, follow metal-level AV rules, and limit cost-sharing to the federal MOOP. States may run a State-Based Marketplace or default to the Federally-Facilitated Marketplace (HealthCare.gov).
- Premium tax credits and cost-sharing reductions are available only through the Marketplace — not for off-Exchange plans.
- Small Business Health Options Program (SHOP) serves small employers (generally up to 50 full-time-equivalent employees).
- The employer shared-responsibility provision applies to Applicable Large Employers (50+ FTEs), which may owe a penalty if a full-time employee gets a subsidized Marketplace plan.
Minimum Essential Coverage and Enrollment Periods
Minimum Essential Coverage (MEC) is the type of coverage that satisfies the ACA's coverage standard. MEC includes employer-sponsored group plans, individual Marketplace and off-Exchange QHPs, Medicare Part A, most Medicaid and CHIP, and TRICARE. It does not include limited-benefit products such as standalone dental, vision, accident-only, critical-illness, fixed-indemnity, or short-term limited-duration plans. Eligibility for affordable MEC elsewhere (such as a job-based plan) disqualifies a person from premium tax credits.
Guaranteed issue makes timing rules essential. The annual Open Enrollment Period is the main window to buy or change an individual plan. Outside it, a Special Enrollment Period (SEP) opens for 60 days after a qualifying life event — losing other MEC, marriage, birth or adoption of a child, divorce affecting coverage, or a permanent move to a new rating area. Voluntarily dropping coverage or non-payment does not trigger an SEP.
Market Segments and Key Reforms
The individual market reforms differ by employer size, and the exam tests these boundaries.
| Segment | Guaranteed issue | EHB / metal rules | Subsidies |
|---|---|---|---|
| Individual (non-grandfathered) | Yes | Yes | PTC/CSR via Exchange |
| Small group (generally ≤50) | Yes | Yes | SHOP credit may apply |
| Large group (50+) | Issued via employer | Not bound to full EHB package | No individual PTC |
Other durable reforms apply across compliant plans: dependent coverage up to age 26, no pre-existing-condition exclusions for anyone, no lifetime or annual dollar limits on EHBs, a cap on the small-group/individual medical loss ratio (insurers must spend a minimum share of premium on care or issue rebates), and a prohibition on rescinding coverage except for fraud or intentional misrepresentation.
Under ACA modified community rating, which factor may an insurer use to vary individual-market premiums?
A 21-year-old non-tobacco user pays a base premium of $280 per month. What is the maximum monthly premium an insurer may charge an older adult based on age alone?
The Three-to-One Age Band and Tobacco Surcharge
ACA modified community rating allows premium variation on only four factors, and the magnitude is capped. The age band is limited to 3:1 (an insurer may charge the oldest adults at most three times the youngest adults' rate), and the tobacco surcharge is capped at 1.5:1. Health status, gender, and claims history may not affect the premium.
| Permitted factor | Limit |
|---|---|
| Age | 3:1 maximum ratio |
| Tobacco use | 1.5:1 maximum surcharge |
| Geographic area | By rating region |
| Family size / tier | Per-member build-up |
SHOP, Special Enrollment, and the Individual Mandate Status
Small employers use the SHOP marketplace; individuals use the individual exchange. Enrollment is limited to the annual open enrollment window unless a qualifying life event (marriage, birth, loss of coverage, move) opens a 60-day special enrollment period. Note for currency: the federal individual-mandate penalty was reduced to $0 in 2019, though some states impose their own mandate — a frequently updated fact examiners use to separate current candidates from those studying outdated material.