I don't know about levels.fyi (they want me to register / upgrade to see what salaries are like in Amsterdam), but I gave some more details in another comment: https://news.ycombinator.com/item?id=37359237
In short: I'm working 4 days / week (3 billable days, 1 overhead) and earning about double of what I'd otherwise get. Though obviously I'm taking additional risk. You are right that the healthcare side of things is covered.
Here's some stuff that falls under overhead: writing blog posts (this one took me at least 10 hours to write), networking, sales conversations, keeping my own knowledge up to date. It's not consistently one day, but I'd say on average it is.
That sounds about right. In fact for some types of billable consulting work, it's probably low. (It was a bit more complicated when I was an analyst because some of the non-production work was client service. On the other hand, a lot of the production work (call it writing) wasn't paid for. So, net, your billable hours per hours worked can be fairly modest.
In short: I'm working 4 days / week (3 billable days, 1 overhead) and earning about double of what I'd otherwise get. Though obviously I'm taking additional risk. You are right that the healthcare side of things is covered.