The US spends an inordinate amount on healthcare since the system is covered in leeches (17~% of GDP compared to 10~ in Europe).[1] If a significant part of US debt is caused by healthcare costs, then that sounds like a political own-goal. That's not to say the costs in Europe are insignificant. We can probably do better here too.
[1] https://jamanetwork.com/journals/jama/article-abstract/26746...