Missouri: husband responsible for wife's medical bills?

It was changed by 1997. The change could well have happened earlier.

Ah yes, you’re right. I had forgotten that Mary became Mrs John Smith. Even as a kid I remember thinking how ridiculous it was that my aunt would send a letter to her sister (my mother) using the equivalent of Mrs J Smith on the envelope, rather than Mrs M Smith.

Traditionally Mrs Mary Smith would imply she was the ex-wife of John Smith; though there were exceptions. Legal and banking documents would use her first name; as would a widow’s marriage announcements & wedding invitations. I also had a (great aunt) who would do that to my mother (& put Master on my cards; which I always though sounded more impressive than Mister). God help anyone who called her Miss or Mrs though; she was Doctor, and went through all kinds of crap back in the '30s to earn it.

A married woman was Mrs John Smith in some circumstances and Mary Smith in others; she was never Mrs Mary Smith.

A widow or a divorced woman (who did not revert to her maiden name) was Mrs Mary Smith or plain Mary Smith in all circumstances; never Mrs John Smith.

Mr John Smith, John Smith Esq and just plain John Smith always referred to the husband, and never to the couple.

I have never heard that at all. John Smith is John Smith, and his wife might be Mrs. John Smith, or now just Jane Smith, but she has never been John Smith.

The situation in the 90s doesn’t surprise me at all. My husband was considered the head of the house, and all bills went to him, even my medical bills under my insurance.

It’s all different now, but wasn’t 20 - 25 years ago, which is what he OP is talking about.

I haven’t lived in Missouri since the '70s, but it was definately the law then.

When my first husband and I had our marriage desolved, the judge asked me, specificly, if I had any unpaid medical or dental bills. I was puzzled as to why he would presume to ask such a question. It turned out that my ex was responsible for my dental bills, even though I made a great deal more money than he did.
Since he was lying, cheating scum. I let the court make him pay.

Just so you know, I was 27, after 9 years of marraige. I wouldn’t do that today. I still feel a bit guilty about it. I’ve made my own way in this life before and after. It was the only way to punish him for breaking my heart.

That’s slightly different. Your insurer is the payor and you are a guarantor. Even if it’s your policy you are not personally liable for the bill unless the jurisdiction follows the doctrine of necessaries/necessities discussed above. As a guarantor, you become liable as a secondary payor - meaning they only get to come after you if the insurer and your wife don’t pay.

However, iirc names have no real meaning in the Common Law other than as identifiers. If the wife of Mr. John Jones wants to be known as Mrs. John Jones, that just happens to be the name she has and medical providers are entitled to bill her under that name, etc. If she wants to be known as Alice Madison Nebuchadnezzar Geer’da’g’w-Neilson-O’Hara nee Smith, then that’s her name. Having one name or another doesn’t actually create or destroy legal rights. The same thing applies to children - if the children of John Jones want to change their last name to Williamson, they don’t stop being the legal children of John Jones by virtue of the name change.