I've seen higher numbers elsewhere, something like 60+%, though I'm not sure where it stands with the 2008 housing crash. What's more concerning is that most people with medical bankruptcies had health insurance at the time they initially got sick. This bit[1] from the 2009 in the NYT says 3/4 had health insurance, but I just remember reading it was more than half in the last few years.

[1]https://prescriptions.blogs.nytimes.com/2009/09/07/insured-b...