What is a health insurance deductible?

The deductible is the amount you pay yourself for covered care before your plan starts sharing the cost. For example, with a $2,000 deductible you pay the first $2,000 of covered care; after that, the plan begins paying its share. A lower monthly premium often comes with a higher deductible, so it is important to look at both together.

What is the difference between a copay and coinsurance?

A copay is a fixed flat fee for a specific service, such as $30 to see a doctor — you know the amount in advance, and it often applies even before you meet your deductible. Coinsurance is a percentage you pay after you have met your deductible; for example, 20% coinsurance means the plan pays 80% of a covered service and you pay 20%.

What is an out-of-pocket maximum?

The out-of-pocket maximum is the most you will pay for covered care in a plan year. Your deductible, copays, and coinsurance all count toward it. Once you reach it, the plan pays 100% of covered costs for the rest of the year. It is arguably the most important number on a plan because it defines your worst-case yearly cost.

Does a low premium mean a cheap health plan?

Not necessarily. The premium is only what you pay monthly to have the plan — it is not the price of your care. A low premium is frequently paired with a high deductible or high coinsurance, which moves the cost to when you actually use care. To compare plans fairly, look at all five numbers — premium, deductible, copay, coinsurance, and out-of-pocket maximum — against how much care you expect to use.

How to read a health plan: deductible, copay, coinsurance & out-of-pocket max explained

Health plans are written in a language nobody teaches you. But five words decide what you actually pay — and once you know them, the whole thing stops being scary. Here's each one in plain English, plus a worked example.

It's not that people are bad at health insurance. It's that nobody ever sat them down and translated the words. There are basically five that decide what you pay: premium, deductible, copay, coinsurance, and out-of-pocket maximum. Learn these five and you can read any plan in the country. (The example numbers below are just to show how the machine works — your real plan will have its own figures.)

1. Premium — your monthly cover charge

The premium is what you pay every month just to have the plan, whether you use it or not — like a subscription. The classic mistake is thinking the premium is the price of your health care. It isn't. It's the cover charge to get in the door. The other four words are where your real costs live, which is exactly why shopping on premium alone gets people into trouble.

2. Deductible — what you pay before the plan helps

The deductible is what you pay yourself before the plan starts chipping in. If your deductible is, say, $2,000, you cover the first $2,000 of covered care, and until you hit it the plan is mostly watching from the sidelines. Once you've paid it, the plan wakes up and starts sharing the cost. This is where the premium trap lives: a plan can look cheap every month and then hand you a big deductible the moment you need care. Low premium, high deductible — you didn't save money, you just moved the bill to a different envelope.

3. Copay — a small, predictable flat fee

A copay is a fixed fee for a specific thing — $30 to see your doctor, $15 for a prescription. You know the number in advance, which makes copays the friendly ones. On many plans they apply even before you've met your deductible, so you're not paying full price for a routine visit. Always check which services have copays; that's often where a plan is quietly generous or quietly stingy.

4. Coinsurance — your percentage after the deductible

Coinsurance is the confusing cousin of the copay. Instead of a flat fee, it's a percentage you pay after you've met your deductible. "20% coinsurance" means once the deductible's done, the plan pays 80% of a covered service and you pay 20%. The trap: people hear "the plan pays 80%" and relax — but 20% of a large hospital bill is still a real number. Which is exactly why the fifth word matters so much.

"Your premium tells you your best-case monthly cost. Your out-of-pocket max tells you your worst-case year. Know both before you pick."

5. Out-of-pocket maximum — your ceiling

The out-of-pocket maximum is the most you'll pay in a plan year for covered care. Deductible, copays, coinsurance — all of it counts toward this number. The moment you hit it, the plan pays 100% of covered costs for the rest of the year. It's the most important figure on the whole page and almost nobody looks at it. It's your worst-case year, capped.

Putting it together: one story

Here's the whole machine in sequence. You pay your monthly premium just to have the plan. You break your ankle, so you start paying toward your deductible until it's met. After that, your coinsurance kicks in — you and the plan split the bills by percentage. Copays cover your routine follow-up visits along the way. And if it's a rough year, all of that adds up until you hit your out-of-pocket max — and from there, the plan covers everything. Five words, in order. That's it.

Your homework

Pull up your plan's Summary of Benefits — every plan has one — and find those five numbers. Then judge the plan against how much care you actually expect to use: someone healthy who rarely visits the doctor makes a different call than someone managing a chronic condition. Same five words, different right answer. If you can't find the numbers, or can't tell what they mean for your situation, that's exactly the moment to have someone who reads these every day translate it with you. (New to shopping for your own plan? Our guide for the self-employed is a good next read.)

How to actually read a health plan.