Isn't really insurance, that is. At least, not if your definition of "insurance" incorporates a significant amount of risk-sharing. As a practical matter (i.e., mortgage financing), every homeowner in my city pays a sum of money each year for fire insurance coverage on their home. Very, very few of these homeowners will ever experience, and submit a claim for, an insured fire loss. Over the 15-year or 30-year life of their mortgage, they will have paid thousands of dollars of premiums, and received no payment back from the fire insurance company. But, over that same 15-year or 30-year period, a few homeowners will experience substantial fire loss, and they may receive tens of thousands, or hundreds of thousands, of dollars from a fire insurance company to which they have paid merely thousands, or even just hundreds, of dollars of premium. That is insured risk-spreading, as Ben Franklin envisioned it back in old Philadelphia.
The premise here is that health "insurance", as sold today, is simply not based on this principle of spreading risk and the cost of loss. Many, many people in my city are covered by some sort of private-market health insurance policy. Very, very few of those people will not experience, and therefore submit a claim for, a health care expense this year. And again next year. And the year after. It is not too much of a stretch to say that the health inurance companies are just holding our money until it needs to be sent to the physician, hospital, clinic, or pharmacy.
I have heard that there was a time when health insurance was more like fire insurance. That is, it was designed to collect modest amounts of money from many who would not claim any of it back, in order to pay relatively large sums to, or on behalf of, a few who experienced catastrophic health events . If so, those days are long gone. Particularly as federal and state governments have passed laws requiring that health "insurance" policies pay for procedures or treatments that the legislatures concludes all citizens should have access to - that is, the legislatures have increased the proportion of assured claims for benefits, and thereby further decreased the risk spreading aspect of health "insurance."
Yes, I know. Some of us will have heart attacks, and some will have cancers, and some experience prolonged debilitating dementia, while some of us will live out the term of our bodily mortgage acquiring nothing more than stronger lenses and gradually accumulating prescriptions. This does reflect a measure of risk spreading. A vestigial measure.
Return, for a moment, to the phenomenon of legislatures regulating health insurance policies by requiring that certain treatments be covered. Most likely, some legislators have mailed the folks back in the district, touting their support for the constituents' "right" to have a certain treatment or procedure paid for by the insurance company. What is this, but a piecemeal approach to "universal health coverage"? A piecemeal approach that has been "rational" to politicians, but would be deemed "rational" by few economists or accountants. Or, health care providers.