Copay vs Coinsurance: What's the Difference?

Copays and coinsurance both describe what you pay when you get medical care. But they work differently, and understanding the distinction helps you predict what a doctor visit, prescription, or surgery will actually cost you.

Copay: A Fixed Amount

A copay is a set dollar amount you pay for a specific service. $26 for a primary care visit. $44 for a specialist. $11 for a generic drug. The number doesn't change based on the total cost of the service. You know exactly what you'll owe before you walk in the door.

Coinsurance: A Percentage

Coinsurance is a percentage of the bill you pay after meeting your deductible. With 20% coinsurance, you pay 20% of whatever the service costs. That means your share varies. Twenty percent of a $200 lab bill is $40. Twenty percent of a $30,000 surgery is $6,000. You can't predict the exact number until you see the bill.

When Each One Applies

Many plans use both. You might pay a $26 copay for a routine office visit but 20% coinsurance for a hospital stay. Some plans apply copays before the deductible (so you just pay the copay for doctor visits from day one), while coinsurance almost always kicks in only after the deductible is met. Check your Summary of Benefits to see how your specific plan handles it.

Which Plans Use Which

HMO plans lean heavily on copays, which keeps costs predictable. PPO and HDHP plans use more coinsurance. On the ACA Marketplace, lower-tier plans (Bronze, Silver) tend to use more coinsurance, while higher-tier plans (Gold, Platinum) rely more on copays with lower or no deductibles.

Both Count Toward Your Out-of-Pocket Max

Every dollar you spend on copays and coinsurance counts toward your annual out-of-pocket maximum. For 2026, ACA plans cap this at $10,150 for individuals and $20,300 for families. Once you reach it, you pay nothing more for covered in-network care the rest of the year.