The ACA significantly expanded health insurance coverage, particularly by broadening Medicaid eligibility and establishing health insurance marketplaces.

Before the ACA, Medicaid eligibility was often restricted to very specific low-income groups, primarily pregnant women, children, and individuals with disabilities. The ACA expanded Medicaid eligibility to include nearly all non-elderly adults with incomes up to 138% of the federal poverty level. This provision was initially a mandatory part of the law, but a 2012 Supreme Court ruling made it optional for states, leading to a patchwork of expansion across the country. Concurrently, the law created Health Insurance Marketplaces (or exchanges) where individuals and small businesses could shop for private health insurance plans. These marketplaces allowed consumers to compare plans, often with financial assistance (subsidies) based on income, making coverage more affordable for millions who didn't receive insurance through an employer or government program. These mechanisms were central to the ACA's goal of reducing the number of uninsured Americans.

The ACA introduced consumer protections, most notably prohibiting insurers from denying coverage or charging more due to pre-existing conditions.

One of the most widely popular and impactful provisions of the ACA was the elimination of medical underwriting based on health status. Prior to the ACA, health insurance companies could, and often did, deny coverage, charge higher premiums, or exclude certain benefits for individuals with pre-existing conditions like diabetes, cancer, or heart disease. This left millions vulnerable and unable to secure affordable, comprehensive coverage. The ACA mandated that insurers offer coverage to all applicants regardless of health status (known as 'guaranteed issue') and could not charge higher premiums based on health (known as 'community rating' for health, age, and tobacco use, with limits). This provision fundamentally reshaped the individual health insurance market, providing critical security for those with ongoing health needs and shifting the risk pool to be more inclusive.

The individual mandate, requiring most Americans to have health insurance or pay a penalty, was a central but controversial component of the ACA, though its penalty was later repealed.

To ensure a balanced risk pool — meaning enough healthy people enrolled to offset the costs of sicker individuals — the ACA included an 'individual mandate.' This provision required most Americans to obtain minimum essential health coverage or pay a tax penalty. The idea was to prevent a scenario where only sick individuals purchased insurance, driving up premiums for everyone. While crucial to the law's economic model, the individual mandate was highly contentious, leading to a Supreme Court challenge that upheld its constitutionality as a tax. However, as part of the Tax Cuts and Jobs Act of 2017, the penalty for not having insurance was reduced to $0, effectively repealing the enforcement mechanism of the individual mandate starting in 2019. Despite the removal of the federal penalty, some states have since implemented their own individual mandates.

The ACA mandated Essential Health Benefits (EHBs) that all plans sold on the marketplaces and in the small group market must cover, including maternity care, mental health services, and prescription drugs.

Before the ACA, the scope of coverage offered by health insurance plans could vary dramatically, leaving consumers vulnerable to unexpected costs for critical services. Many plans lacked coverage for essential services like maternity care, mental health, or prescription drugs, or imposed annual and lifetime limits on benefits, potentially leaving individuals with catastrophic medical bills. To address this, the ACA established ten categories of 'Essential Health Benefits' (EHBs) that most health insurance plans must cover. These include ambulatory patient services, emergency services, hospitalization, maternity and newborn care, mental health and substance use disorder services, prescription drugs, rehabilitative and habilitative services, laboratory services, preventive and wellness services, and pediatric services. This standardization ensures a minimum level of comprehensive coverage, protecting consumers and improving overall health outcomes by making vital services universally accessible within covered plans.

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