So even if it would work out that people would spend less overall, I believe the tax system needs to be simplified and aimed at providing sufficient income to run the government rather than encouraging/discouraging particular behaviors.
The only reason why I advocate having the government be lender of last resort is that I do believe that some people get hit with big medical expenses that they can't ever hope to repay in their lifetimes. We as a society will benefit if we can get them on their feet as quick as we can so that they can become productive members once again. They may not be able to pay off their expenses, but the system I propose would lead to a much lower overall cost to medical expenses, and the money lost by taxpayers in supporting those whose medical expenses outstrip their resources would be more than compensated by the lower overall cost to everyone.
Cosmetic procedures aren’t covered now.
This would be a start with no government program increase and no increase in taxes.