If you have an exorbitantly expensive medicine that is covered under Medicare Part D (extremely, extremely likely), then you will face something called Medicare Part D catastrophic coverage. One should especially look into the data on that.
It is really easy to be in the Medicare Part D catastrophic coverage situation. Even if you are sitting on a mountain of cash during retirement, it is profoundly wasteful to be paying anywhere from $20,000/year-$100,000/year for your medicine, which is usually a lifesaving medicine, and is life or death, whether you take it or not.
Not to mention: The third leading cause of death in the United States in preventable medical errors. If you do not believe me then Google it. When a country has the third leading cause of death as preventable medical errors, they are almost always developing or third world countries. But, the US is an anomaly in that respect.
You can go the the best hospitals and the best doctors in the United States, but you cannot evade a statistic like that. When that statistic is so high, these issues are so pervasive that they are definitely present in a completely unacceptable way, even with the best institutions, hospitals and doctors in the United States.
If one was smart, they would investigate this further and decide to leave. Europe, especially West and Northern Europe, should be places one should by vying for. But anywhere in the European Union typically will be a step up from this chaos of a system.