What Is a Copay? (Copay vs. Coinsurance)

When you use health insurance, you usually still pay something at the point of care — even after your premium, even while working toward your deductible. That something is almost always one of two things: a copay or coinsurance. They're easy to confuse, but they work differently, and knowing which one applies tells you what a visit or prescription will actually cost.

What a copay is

A copay (short for copayment) is a flat, fixed amount you pay for a specific service — say $30 for a doctor's visit or $15 for a prescription. You know the number in advance, and it doesn't change with the size of the underlying bill. That predictability is the whole appeal: a copay tells you exactly what you'll pay before you walk in.

What coinsurance is

Coinsurance is a percentage of the cost. You pay your share — often something like 20% — and your insurer pays the rest. Because it's a percentage, your cost rises with the price of the care: 20% of a routine test is small, but 20% of a major procedure can be a serious bill. Coinsurance is less predictable than a copay for exactly that reason.

Copay vs. coinsurance — the difference in one line

A copay is a fixed price; coinsurance is a percentage. A copay stays the same no matter the bill; coinsurance scales with it. Many plans use both — copays for everyday visits, coinsurance for bigger services.

Where the deductible fits in

Copays and coinsurance usually work alongside your deductible, not instead of it. A common pattern: a plan charges copays for some everyday care from day one, but applies coinsurance only after you've met your deductible. And whichever you pay, it typically counts toward your out-of-pocket maximum — the ceiling on what a year can cost you. (See Deductible vs. Out-of-Pocket Maximum.)

Where to find yours

Your copays and coinsurance are listed on your plan's Summary of Benefits, broken down by type of service. This is health-insurance language specifically — other kinds of policies share costs through deductibles and limits instead. (If the benefits table is hard to read, a tool like tomapo can lay out what you'd pay in plain English — but it's in your plan summary either way.)

For how these pieces fit together, start with How to Understand Your Insurance Policy.

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This article is general education, not advice about your specific policy or financial situation. Your own policy document is always the authoritative source for what you're covered for, and for decisions it's best to speak with a licensed insurance professional.