Will homeowners insurance cover medical expenses to someone living in the home who is not listed as a homeowner?
No. The injured party cannot be a household member. It does not matter if they are not listed on the policy.
When you own a home you are libl for nything that happens on your property. Homeowners liability insurance covers you in the event someone i injured on your property. Homeowner's liability insurance covers the homeowner in the event that someone gets injured while on their property. It covers medical bills and other expenses for guests if something happens to them while at your home.
Homeowners insurance is "Property Coverage". Most home insurance policies only have 500 dollars medical coverage for the named insured which covers minor house hold injuries in and around the house. Some home insurance policies have no medical coverage at all since it's "property insurance". Your home insurance policy does not and can not replace your major medical or health insurance policy. Medical insurance and property insurance are two very different kinds of insurance.