What is the difference between a copay and a deductible?

Both are you paying, but they operate at different moments in the year. HealthCare.gov's definitions make the split clean. A copayment is a fixed amount - say $30 - you pay for a covered service, usually at the time you get it: the flat fee at the doctor's door or the pharmacy counter. A deductible is the amount you pay for covered services each year before your insurance plan starts to share the costs. Picture the year as a ladder. Before the deductible: on a high-deductible plan, that $120 visit is mostly yours - you pay the negotiated rate, and it feeds your deductible total. After you cross the deductible: insurance starts splitting costs, and you pay copays or a percentage (coinsurance) instead. Keep climbing and you hit the out-of-pocket maximum, where the plan pays covered costs in full for the rest of the year. The interaction people miss: many plans exempt some things from the deductible - preventive care is usually free on day one, and some plans charge only copays for doctor visits and generics even before the deductible is met. So read your plan's summary for three numbers: the deductible, the copay amounts, and the out-of-pocket max - those three tell you your worst-case year. Copays and coinsurance generally count toward that out-of-pocket maximum even though they do not count toward the deductible. Pymander is a free AI doctor, 24/7 by text, and can help you read a specific plan document.