Explainer

How a Health Insurance Deductible Works

Premium, deductible, copay, coinsurance, out-of-pocket max: US health insurance runs on five terms most people never had explained. Here is how they fit together over a plan year.

By Newsmotion·Updated July 2026

Photo: Wikimedia Commons, via Wikimedia Commons (CC BY-SA)

US health insurance is built on a handful of terms that plans rarely bother to explain clearly. Once you understand five of them and how they interact, the whole system gets a lot less confusing.

The five terms

Premium: the fixed amount you pay, usually monthly, just to have coverage, whether or not you use any care.
Deductible: the amount you pay out of pocket for covered services before your plan starts paying its share. It resets every plan year.
Copay: a flat fee for a specific service, like $30 for an office visit. Depending on the plan, copays may apply before or after you meet the deductible.
Coinsurance: your percentage share of a cost after you have met the deductible, for example you pay 20% and the plan pays 80%.
Out-of-pocket maximum: the annual ceiling on what you pay for covered, in-network care. Once you hit it, the plan pays 100% of covered services for the rest of the year.

The key relationship: premiums are separate from everything else and do not count toward your deductible or your out-of-pocket maximum.

A worked example

Say your plan has a $2,000 deductible, 20% coinsurance, and an $8,000 out-of-pocket maximum. Over the year, it plays out like this:

You pay the first $2,000 of covered care yourself. That is the deductible.
After that, you pay 20% coinsurance on further covered care, and the plan pays 80%.
Your share keeps accumulating until your total spending hits $8,000, the out-of-pocket max. From that point, the plan covers everything for the rest of the plan year.

All of that is on top of the monthly premium, which you pay regardless.

A low premium usually means a high deductible, and vice versa. The right trade-off depends on how much care you expect to use in a year.

High-deductible plans and HSAs

A High-Deductible Health Plan (HDHP) pairs a higher deductible with a lower premium and, importantly, makes you eligible for a Health Savings Account (HSA). An HSA offers a rare triple tax advantage: contributions go in pre-tax, the money grows tax-free, and withdrawals for medical costs are tax-free.

For 2026, the HSA contribution limit is $4,400 for individual coverage and $8,750 for family coverage, with an extra $1,000 allowed at age 55 and up. These limits change every year.

The care that is free before your deductible

One provision surprises people: under the Affordable Care Act, most plans must cover a defined list of preventive services at no cost to you, no copay, no coinsurance, and before you meet the deductible. That includes many recommended immunizations, screenings, and wellness visits.

Read the fine print

The $0 preventive benefit applies only to in-network providers and only when the service is billed as preventive. If a screening turns into a diagnostic follow-up, normal cost-sharing can kick in. When in doubt, ask how a visit will be coded.

Choosing a plan

The practical question is not "which plan is cheapest," but "which plan is cheapest for how much care I will actually use." If you rarely see a doctor, a high-deductible plan with a low premium and an HSA can win. If you have ongoing care or expect a big year, a higher premium with a lower deductible may cost less overall.

This is general information, not medical or insurance advice. Your plan's summary of benefits has the exact numbers for your situation.