Hospitals and most doctor’s offices in the US have financial aide for uninsured or people who can’t afford their medical needs. Usually, the patient or their representative has to pursue it. The medical staff don’t have anything to do with the financial stuff, so you have to contact the billing department.
I’ve lived in several states in the US and it wasn’t legal in any of them for medical debts to transfer to a surviving spouse unless the spouse filled out and signed paperwork agreeing to be financially responsible. There may be states where this is legal, but I’ve never heard of it actually happening. Also, they can’t seize your assets, like your home or car, for medical debts.
Most cities in the US have what is referred to as a county hospital. These offer the most financial aide and lowest costs for medical procedures and are at least partially tax supported. Most places also have free clinics that will provide non-emergent care. You just have to look them up and wait times will usually be longer than going to a corporately owned hospital or private doctor.
In the case of something emergent but not life threatening, like a broken arm, an emergency room is legally required to stabilize you. Then, if you refuse to do paperwork for financial responsibility, they can discharge you or transfer you to a county hospital. If it is life threatening or catastrophic, the emergency room must treat you and stabilize you whether you can pay or not. If you require hospitalization or ICU care, they must provide it until you are stable enough for them to arrange transport to a county hospital. Some corporately owned hospitals have closed their emergency departments so they can choose to only provide services to those with adequate medical insurance.
In my experience, as long as you make the effort to contact the billing department, express a willingness to make payments and work with them, they will also work with you. In most states, making payments, even $25/month, will keep them from even calling you about medical debt. Also, unless you’ve agreed to it in writing, they can’t charge interest. I’ve known a lot of people who have racked up large, scary medical debt and every one of them got almost all of it covered with financial aide and got reasonable payment plans because they contacted the billing department and worked with them.