The out-of-pocket maximum is a yearly ceiling on what you pay for covered medical care. Your deductible, copays, and coinsurance all count toward it. Once your spending reaches that number, insurance pays 100% of covered care for the rest of the year. It is the true worst-case number in your health plan.
Health insurance has a lot of numbers, but this is the one that tells you the most: how bad can a bad year actually get? The out-of-pocket maximum is your plan's answer. If you get seriously sick or hurt, this number — not the deductible — is where your costs stop.
What counts toward it
Almost everything you pay for covered, in-network care: the deductible you burn through first, the copays at the counter, and your coinsurance percentages on bigger bills. Add them up as the year goes, and when the running total touches the maximum, you are done paying for covered care until January. What does not count: your monthly premiums, and care your plan does not cover at all.
Your plan's out-of-pocket maximum is $4,000. In March, surgery costs you your $1,500 deductible plus $2,000 in coinsurance — $3,500 total. In June, a follow-up procedure comes with a $900 coinsurance bill, but you only owe $500 of it, because that is where you hit $4,000. In November, another covered procedure costs you exactly $0. For the rest of the year, the plan pays in full.
Individual and family ceilings
Family plans carry two numbers: an individual maximum for each person and a higher family maximum for everyone combined. On many plans, once one person's spending hits the individual ceiling, that person is covered in full even if the family total is nowhere near its cap. The plan's summary page spells out which kind you have.
Why it matters when choosing a plan
A cheap monthly premium often hides a huge out-of-pocket maximum, and an expensive premium often buys a low one. Comparing plans by premium alone is like comparing cars by the paint. Line up the maximums — that is the honest comparison for a bad year.