No, but at least there is a buffer.
Good friends of us had their child at the same time as we. It developed polio lite two years ago. He nearly died and still has lots of issues (not as bad as the maximum polio has to offer but basically cannot us his arms).
The initial hospital stay was two months, one enterily on the ICU. Afterwards months of rehab. Now special needs kindergarten and later on in school he will need a nurse to accompany him.
Most of that is paid for except some medical items the medical provider deemed not necessary. Also time was not an issue, both where able to stay away from work for months and get paid sick leave for that time.
It still wrecks me to see him in that condition and his parents are still in shit condition but that's grief and exhaustion but not existential fear due to lack of income or .medical costs.
And yes, of course there are cases that will fall through gaps. But at least most of the cases are covered, and it does not depend on having enough money.