Up until recently it was absolutely possible to have good health insurance and still go bankrupt because of costs not covered 100% by insurance.

Affordable care act set limits on what is called the “Out of pocket maximum”

Per plan year that legally allowed maximum will be something like $20,000, which is still enough to knock out most people. To make matters worse, those legal limits are going up for some bullshit reason, but wages are not going up enough to match. https://www.healthsystemtracker.org/brief/aca-maximum-out-of-pocket-limit-is-growing-faster-than-wages/