Deductible, Out-of-Pocket Max, Copay, Coinsurance: The Real Math

Your deductible is the amount you pay out of pocket for covered services before insurance starts paying. If your deductible is $3,000, you pay the first $3,000 of covered care yourself. Insurance only starts contributing after that.

Deductibles reset every January 1 (or whenever your plan year resets). A surgery in December counts toward this year's deductible. The same surgery in January counts toward next year's.

A copay is a fixed dollar amount you pay at the time of service, regardless of whether you've met your deductible. Common examples: $25 for a primary care visit, $50 for a specialist, $15 for a generic prescription.

Some plans charge copays in addition to the deductible. Some plans waive copays once you've met the deductible. Some plans have copays that don't count toward the deductible at all. The plan summary tells you which.

Once you've met your deductible, you usually still owe a percentage of each covered service. That percentage is coinsurance. If your coinsurance is 20 percent, you pay 20 percent of the cost of each service after you've hit the deductible, and the insurance company pays the other 80 percent.

Coinsurance applies until you hit your out-of-pocket maximum. After that, insurance pays 100 percent for the rest of the year.

Your out-of-pocket max is the most you'll pay in covered medical expenses in a given plan year. Once you hit it, insurance covers 100 percent of in-network care for the rest of the year. Deductible, copays, and coinsurance all count toward this number. Monthly premiums do not.

For 2026 ACA plans, the maximum allowable out-of-pocket max is $9,200 for an individual and $18,400 for a family. Most plans set theirs lower. This number is the worst-case scenario for the year.

Walk through a real example. Your plan has a $3,000 deductible, $40 specialist copay, 20 percent coinsurance, and $6,000 out-of-pocket max.

You see a specialist in February. The visit is billed at $400. The plan's allowed amount is $250. You pay the $40 copay. The visit goes toward your deductible.

Later that year, you need an MRI. Billed at $3,000, allowed at $1,500. You haven't met your deductible yet, so you pay the full $1,500 out of pocket. That brings your total deductible spending to $1,540.

You need surgery in November. The hospital bills $40,000, the allowed amount is $18,000. You owe the remaining $1,460 to finish your deductible, then 20 percent coinsurance on the rest. That's $1,460 + (20% of $16,540) = $4,768. But you only owe up to the $6,000 out-of-pocket max minus what you've already spent ($1,540), which is $4,460. Anything above that, insurance pays at 100 percent.

The number that matters depends on how much care you expect to use. If you're healthy and don't go to the doctor, the monthly premium and out-of-pocket max are what to watch. If you take regular medications or have a chronic condition, the deductible and copays are bigger drivers of your annual cost.

Total annual cost is what to optimize for, not monthly premium. Plansure brokers run that math against your real expected utilization before we recommend a plan.