Health perception biases can have serious consequences on health. Despite their relevance, the role of such biases in determining healthcare utilisation is severely underexplored. Here we study the relationship between health misperception, doctor visits, and concomitant out-of-pocket expenditures for the population 50+ in Europe. We conceptualise health misperception as arising from either overconfidence or under confidence, where overconfidence is measured as overestimation of health and under confidence is measured as underestimation of health. Comparing objective performance measures and their self-reported equivalents from the Survey of Health, Ageing and Retirement in Europe, we find that individuals who overestimate their health visit the doctor 14% less often than individuals who correctly assess their health, which is crucial for preventive care such as screenings. Lower health care utilization is accompanied by lower out-of-pocket spending (38% less). In contrast, individuals who underestimate their health visit the doctor more often (28% more) and have higher out-of-pocket spending (17% more). We project that underestimating health of the population 50+ will cost the average European country Intl$ 71 million in 2020 and Intl$ 81million by 2060. Country-specific estimates based on population and demographic projections show that countries such as Germany, Denmark and The Netherlands will experience significantly large costs of such misperception. The results are robust to several sensitivity tests and, more important, to various conceptualisations of the misperception measure.