Deductible, Premium and Copay Explained (With a Worked Example)
Five money words decide what US healthcare actually costs you: premium, deductible, copay, coinsurance and out-of-pocket maximum. Learn each one on its own, then watch all five combine on a single hospital bill.
The five terms, one by one
- Premium — the monthly price of your plan, like a subscription. You pay it all year whether you use care or not, and it never counts toward your deductible. Example below: $400 a month.
- Deductible — the amount you pay yourself for covered care each year before the plan starts sharing most costs. If your deductible is $1,500, the first $1,500 of covered bills is on you. Some services, like many preventive visits, are covered before the deductible.
- Copay — a flat fee for a specific service: $30 for a primary care visit, $60 for a specialist, $15 for a generic prescription, for example. Copays are usually paid at the time of service and, on many plans, do not require the deductible to be met first.
- Coinsurance — your percentage share of a bill after the deductible. A common split is 20% you / 80% plan. Unlike a copay, the dollar amount grows with the size of the bill.
- Out-of-pocket maximum — your safety ceiling. Every deductible payment, copay and coinsurance dollar for covered in-network care counts toward it. Reach it, and the plan pays 100% of covered in-network care for the rest of the plan year.
A quick memory hook: the premium buys the plan, the deductible is the doorway, the copay and coinsurance are the sharing, and the out-of-pocket maximum is the roof. For the bigger picture of how these parts were designed, see how health insurance works.
Everyday examples of each term
A copay situation: You visit your primary care doctor for a sore shoulder. Your plan lists a $30 primary care copay, so you pay $30 at the desk and the plan handles the rest of that visit's agreed cost. The deductible is not involved.
A deductible situation: You need an MRI that costs $1,200 at the in-network agreed rate, and you have not paid anything toward your $1,500 deductible yet this year. You owe the full $1,200, and your remaining deductible drops to $300.
A coinsurance situation: Later, a procedure costs $2,000. You pay the first $300 (finishing your deductible), then 20% of the remaining $1,700 — $340. Total from you: $640. The plan pays the other $1,360.
Real bills often mix all three on one statement, which is why the worked example below is worth following slowly.
The worked example: one hospital bill, step by step
Meet a fictional plan and a fictional bill — the numbers are round so the math is easy to follow.
The plan: premium $400/month · deductible $1,500 · coinsurance 20% · out-of-pocket maximum $5,000. This is an in-network hospital stay, so the agreed rate applies.
The event: You have surgery and spend two nights in the hospital. The hospital's sticker price is $20,000, but your plan's agreed in-network rate is $12,000. The agreed rate is what the math runs on — another reason network status matters.
- Deductible first. You have paid nothing toward your deductible this year, so you owe the first $1,500 of the $12,000. Remaining bill: $10,500. Your deductible is now fully met.
- Coinsurance splits the rest. 20% of $10,500 is $2,100 — that is your share. The plan pays 80%, which is $8,400.
- Check the ceiling. Your total for this bill is $1,500 + $2,100 = $3,600. That is below your $5,000 out-of-pocket maximum, so no cap applies yet. You now have $1,400 of room left before the plan would pay 100% of covered in-network care for the rest of the year.
- And the premium? Separate, as always: $400 × 12 = $4,800 for the year, paid regardless of the surgery.
Bottom line: on a $12,000 agreed bill, you paid $3,600 and the plan paid $8,400. Without insurance, the same stay could have been billed at the full $20,000 sticker price. That gap is the entire point of the pool described in how health insurance works.
The mistakes these terms cause
- "My premium is low, so my plan is cheap." A low premium often pairs with a high deductible and higher coinsurance. Compare the premium × 12 plus the cost-sharing you realistically expect — our plan-choosing guide walks through that math.
- "I paid my deductible, so everything is free now." No — after the deductible you still owe copays and coinsurance until you reach the out-of-pocket maximum.
- "The EOB is the bill." The Explanation of Benefits is a statement of what was decided; the provider's bill is what you pay, and the two should agree. Our guide to reading a medical bill shows how to match them.
- Forgetting the reset. Deductibles and out-of-pocket totals restart each plan year. A big bill in December and another in January can mean meeting the deductible twice in two months.
Frequently asked questions
What is the difference between a copay and coinsurance?
A copay is a flat fee you pay for a specific service — for example $30 for a doctor visit — usually paid at the time of the visit. Coinsurance is a percentage of the bill, such as 20% of a hospital charge, and it generally applies after you have met your deductible. Copays are predictable; coinsurance depends on the size of the bill.
What is an out-of-pocket maximum?
It is the most you can pay in a plan year for covered, in-network care. Your deductible, copays and coinsurance all count toward it. Once you reach it, the plan pays 100% of covered in-network costs for the rest of the year. Premiums do not count toward it.
Does my premium count toward my deductible?
No. Your premium is the price of having the plan and never counts toward your deductible or out-of-pocket maximum. Only money you pay for covered care — deductible payments, copays and coinsurance — counts toward those totals.
Choosing between plans?
Now that the cost words make sense, compare plan types side by side in how to choose a health insurance plan — HMO, PPO, EPO and HDHP explained.