Health Insurance Basics: Practice Questions & Explanations

Cost-sharing in health insurance has three main components, often confused. Deductible: the amount the insured pays out of pocket before the plan begins to share costs (e.g., $1,500). Co-payment (copay): a fixed dollar amount paid per service (e.g., $30 for an office visit, $150 for an emergency room visit). Co-insurance: a percentage of the cost the insured pays after the deductible is met (e.g., 20% of the bill, with insurance paying 80%). Out-of-pocket maximum: the most the insured can pay in a year; once reached, the plan pays 100%. Understanding these mechanisms helps the insured estimate their actual cost for care and compare plans. Plans with lower premiums often have higher deductibles, copays, and co-insurance.

A pre-existing condition is a medical condition (diagnosed or known) that existed before health coverage took effect. Historically, individual health policies excluded pre-existing conditions from coverage, charged higher premiums for them, or denied coverage entirely. The Affordable Care Act (ACA) of 2010 prohibited pre-existing condition exclusions and discrimination in individual and small group health insurance starting in 2014 — insurers cannot deny coverage, charge higher premiums, or exclude benefits based on health history. Other policy types may still address pre-existing conditions: short-term health policies, some employer-based plans pre-ACA grandfathered exemptions, and Medicare Supplement plans in certain circumstances. Long-term care and disability income insurance can still consider pre-existing conditions during underwriting.

The out-of-pocket maximum (OOP max) is the total amount the insured can pay for covered services in a plan year. Once the insured reaches this limit (through deductibles, copays, and co-insurance combined), the plan pays 100% of covered services for the rest of the year. Premiums do not count toward the OOP max. Out-of-network costs do not count for many plans. ACA-compliant plans had OOP max limits around $9,450 for individuals in 2024 (the limit is indexed annually). The OOP max provides protection against catastrophic costs from a serious illness or accident. When comparing plans, the OOP max is often more important than the deductible because it represents the worst-case annual exposure.

A deductible is the amount an insured must pay out of pocket for covered health services within a plan period before the insurer starts paying its share. For example, with a $1,000 deductible, the insured pays the first $1,000 of covered costs before coverage kicks in (some services may be covered before the deductible, such as certain preventive care). The premium, by contrast, is the ongoing amount paid to keep the policy in force. Deductibles are part of cost-sharing along with copayments and coinsurance. Understanding the deductible as the insured's upfront cost-share before benefits begin is fundamental health insurance content.

A copayment (copay) is a fixed dollar amount the insured pays for a specific covered service — for example, $25 for a doctor visit. Coinsurance is a percentage of the cost of a covered service that the insured pays, usually after meeting the deductible — for example, the plan pays 80% and the insured pays 20% coinsurance. Both are forms of cost-sharing that divide expenses between the insured and the insurer. The out-of-pocket maximum caps the total an insured pays in a period. Distinguishing the fixed-dollar copay from the percentage-based coinsurance is a commonly tested cost-sharing concept.

The out-of-pocket maximum is the most an insured will have to pay for covered, in-network services during a plan period through deductibles, copayments, and coinsurance combined. Once the insured's spending reaches this cap, the plan generally pays 100% of additional covered, in-network costs for the rest of the period (premiums do not count toward it, and out-of-network costs may not either). This limit protects the insured from catastrophic medical expenses. Understanding the out-of-pocket maximum — and how it differs from the deductible (the upfront amount before coverage begins) — is fundamental cost-sharing content on the health insurance exam.