Why the Jargon Matters
Health insurance documents are full of terms that sound similar but mean very different things — and misunderstanding them can cost you real money when a bill arrives. Whether you are choosing a plan during open enrolment or trying to make sense of a statement, these five concepts are the foundation of almost every health plan: premium, deductible, copay, coinsurance and out-of-pocket maximum. Once you understand how they interact, comparing plans becomes far less intimidating. For context on where health cover sits among other policies, see our beginner’s guide to the types of insurance.
Premium
The premium is the amount you pay — usually monthly — simply to keep the policy active, whether or not you use any medical care. Think of it as a subscription fee. A lower premium often means higher costs when you actually need care, and vice versa. When comparing plans, always weigh the premium against what you would pay out of pocket during a typical year.
Deductible
The deductible is the amount you must pay yourself for covered medical services each year before your insurer starts paying its share. For example, with a $2,000 deductible, you pay the first $2,000 of covered costs yourself; after that, the plan’s cost-sharing begins.
Two nuances to know:
- Some services bypass the deductible. Many plans cover preventive care — such as annual check-ups and certain screenings — at no cost to you, even before the deductible is met.
- Family vs individual deductibles. Family plans often have both an individual deductible per person and a higher family deductible for the household as a whole.
Copay (Copayment)
A copay is a fixed amount you pay for a specific service — for instance, $30 for a GP visit or $15 for a prescription refill. Copays are predictable: you know the cost upfront. On many plans, copays for routine visits apply even before you have met your deductible, though this varies by plan, so check your own documents.
Coinsurance
Coinsurance is your share of the cost of a covered service, expressed as a percentage, and it usually applies after you have met your deductible. A plan with “80/20 coinsurance” means the insurer pays 80% and you pay 20% of the allowed amount for the service. Unlike a copay, coinsurance scales with the bill — 20% of a $500 scan is $100, but 20% of a $10,000 procedure is $2,000. That is why the out-of-pocket maximum (below) is so important.
Out-of-Pocket Maximum
This is the most you will have to pay for covered services in a plan year. Once your spending on deductibles, copays and coinsurance reaches this limit, the plan pays 100% of covered costs for the rest of the year. Premiums do not count toward it, and out-of-network care may not either.
This cap is your financial safety net — it is what turns an unpredictable medical event into a bounded cost. If you are deciding how large a cash buffer to keep, our article on whether your emergency fund is the right size pairs well with this: many people size their emergency savings around their plan’s out-of-pocket maximum.
A Worked Example
Say your plan has a $1,500 deductible, a $30 GP copay, 20% coinsurance after the deductible, and a $6,000 out-of-pocket maximum. In March you need surgery with an allowed cost of $12,000:
- You pay the first $1,500 (your deductible).
- Of the remaining $10,500, you pay 20% coinsurance = $2,100.
- Your total for the surgery is $3,600 — well under your $6,000 out-of-pocket maximum.
- If you need more covered care later that year, you keep paying cost-sharing until your total hits $6,000; after that, covered care costs you nothing more that year.
How to Use These Terms When Choosing a Plan
- Expect frequent routine care? Lower copays and a lower deductible may save you money even with a higher premium.
- Young, healthy and rarely visit the doctor? A high-deductible plan with a lower premium can make sense — but make sure you could actually cover the deductible from savings if something happens.
- Managing a chronic condition? Look closely at the out-of-pocket maximum and coinsurance rates for the services you use most, not just the premium.
- Check the network. The best cost-sharing terms in the world do not help much if your doctors are out of network.
You can look up formal definitions of any of these terms in the official glossary: HealthCare.gov Glossary. And if you are reviewing your broader protection, our guide to life insurance and whether you need it covers the other major personal policy most households consider.
The Bottom Line
Premium is what you pay to have the plan; deductible is what you pay before cost-sharing starts; copays and coinsurance are how you split bills with the insurer; and the out-of-pocket maximum caps your yearly risk. Learn these five terms once, and every plan comparison — and every medical bill — gets easier to read.
This article is for general information only and is not financial, insurance or medical advice. Plan designs vary widely; check your own policy documents or speak to a qualified adviser before making decisions about cover.