Deductible, copay, coinsurance, out-of-pocket maximum

Health insurance in the United States distributes cost between you and the insurer through four mechanisms. They interact, and the interaction is where people get surprised.

The deductible

The amount you pay for covered services before the plan begins paying its share.

With a $2,500 deductible, you pay the first $2,500 of covered care yourself. After that, cost sharing shifts.

Two important qualifications.

Some services are covered before the deductible is met. Preventive care is generally required to be covered without cost sharing on most plans. Many plans also cover primary care visits or certain prescriptions with a copay from the first dollar.

And the deductible applies to the allowed amount, not the billed amount. If a provider bills $900 and the insurer's negotiated rate is $410, the $410 is what counts.

The copay

A fixed dollar amount for a specific service — $30 for a primary care visit, $65 for a specialist, $400 for an emergency room visit.

Predictable, which is its virtue.

Whether copays count toward the deductible varies by plan. Whether they count toward the out-of-pocket maximum generally, they do — but read the specific plan.

Coinsurance

A percentage of the allowed amount, applying after the deductible is met.

Twenty percent coinsurance on a $9,000 procedure, after the deductible, is $1,800.

This is the mechanism that produces large bills, because it is a percentage of an amount you do not control. Twenty percent of a knee replacement is a very different number from twenty percent of an office visit.

The out-of-pocket maximum

The most important number in the policy, and the one people notice last.

It is the ceiling. Once your deductible, copays and coinsurance for covered in-network services reach this figure in a plan year, the plan pays one hundred percent of covered in-network care for the rest of the year.

This is what insurance actually is. Everything else is cost sharing; this is the protection.

When comparing plans, the out-of-pocket maximum matters more than the deductible, because it defines your worst case.

How they work together

Take a plan with a $2,500 deductible, twenty percent coinsurance and an $8,000 out-of-pocket maximum, and a year with $70,000 of covered in-network care at allowed amounts.

You pay the first $2,500.

Then twenty percent of the remaining $67,500 would be $13,500 — but the out-of-pocket maximum stops you at $8,000 total.

So you pay $8,000 and the plan pays $62,000.

Now the same plan with $6,000 of care. You pay $2,500, then twenty percent of $3,500, which is $700. Total $3,200.

What does not count

The exclusions that cause the most distress.

Out-of-network care. Most plans have a separate, much higher out-of-network deductible and out-of-pocket maximum, and some have no out-of-network coverage at all.

Balance billing, where an out-of-network provider bills you the difference between their charge and what the insurer paid. Federal protections now apply in certain situations — emergency care and some non-emergency care at in-network facilities — but not all.

Non-covered services. Anything the plan excludes does not count toward anything, however much you spend.

Premiums. What you pay monthly for coverage never counts toward the deductible or the out-of-pocket maximum.

Individual versus family

Family plans have both individual and family figures, and the mechanics matter.

Typically each family member has an individual deductible and out-of-pocket maximum, and there is a family aggregate. Once an individual meets their own, that person's costs are covered even if the family maximum has not been reached.

Some plans use an aggregate family deductible instead, where nobody's benefits begin until the whole family amount is met. This is a meaningful difference and it is stated in the plan documents.

The plan year reset

All of these reset at the start of the plan year, which is not necessarily January.

Which means care in December and care in January are counted separately, and someone who has met their deductible in November starts from zero in the new year.

Where a procedure is elective and the deductible is already met, completing it before the reset can save a substantial amount. That is a legitimate planning consideration.

General information about insurance concepts, not insurance, financial or medical advice. Policy terms vary and only your policy documents govern your coverage. Consult your insurer or a licensed advisor about your specific plan.