Turning 21 quietly changes what the basic package pays for, and the first sign is usually a pharmacy charge that was not there the month before. The cutoff catches out newcomers used to other systems and long-term residents alike, along with the exceptions that still apply on medical grounds.
It's a coverage cutoff written into the basisverzekering (mandatory basic insurance) itself, not something your particular insurer chose. Contraception — the pill, spiral, implant, ring, injection — is covered up to age 21, and from 21 onward it drops out of the standard package entirely unless there's a medical indication, such as heavy periods or endometriosis, which still qualifies for reimbursement regardless of age. This wasn't always the rule: coverage for adults was removed in a cost-cutting round in the mid-2000s and has stayed off ever since, despite periodic political pressure to reinstate it. The practical impact is smaller than it sounds, though — most common pill brands cost somewhere in the range of €5–15 a month out of pocket at a Dutch pharmacy, not the kind of expense that usually derails a budget once you know it's coming. Some aanvullende (supplementary) insurance packages reimburse contraception for adults; worth checking your specific package or switching during the annual switching window if this matters to you. Between 18 and 20, note that contraception is still covered but counts toward your eigen risico (the mandatory annual deductible), so it isn't necessarily cost-free for that age band either. ---