Over the averaged 20 years, that is 500 dollars per person per month. Most people have greatest medical expense in the last year or two of their life. Most people still do not go into nursing homes. If they do, it is usually a short time before hospice.
One thing is that the figure includes "future dollars" which are less valuable in the future due to inflation. The "present dollar" figure in an earning account is probably less. Present retirement assets, if they exist, can continue to earn until the "future" less valuable dollars are due. If you live longer than the speculative 85, then you will need more.
On the other hand, it is also a median figure. Half the population will need more, some much, much more.
I figure for a couple, 300K in an invested medical account used for only medical purpose, to pay premiums and out of pocket medical as time rolled on, would do the trick, but who knows.