It's a myth. There's no fine for missing a preventive health screening, and that hasn't changed in 2026. A preventive health screening is a complimentary medical examination offered at your clinic, but nobody can force you to get one. There are no penalties in the law for refusing or skipping it.
Your friend probably confused it with something else or heard a scary story. Maybe she was told about fines for missing an appointment with a specific doctor, but even then - fines only apply in narrow cases (like if you work in a certain field and are required to have medical exams as part of your job). For a regular preventive screening, there are no fines at all.
The only consequence of not showing up is that you simply won't get information about your health and your test results. That's why preventive screenings are recommended not because of the threat of punishment, but so you can catch any problems early. But whether you do it or not - that's entirely your choice.