@kayraymat: you've posed some excellent questions,

As far as the right for a patient to refuse treatment: as long as the patient is a competent adult who is not putting the general public at risk for their decision (i,e. severe contagious disease), they generally have a fundamental right to refuse medical intervententions. That is one reason why it's so important to have Advance Directives and/or Living Will, in the event you are rendered unable to relay your wishes (i.e. in the event of traumatic injury or illness resulting in coma, life support) in order for your preferences to be honored.

I'm uncertain as to what you mean by self-determination, but if you're referring to Medical Aid in Dying (or MAid), NY was recently added to 13 other states that do have this provision based on criteria of terminal illness, mental compentency, voluntary request and ability to self-administer the necessary medication. Residency rules and mental health evaluations vary by state.

This is the latest information as I know it but it may help to update the search from time to time if you're interested in remaining current or pro-active in the cause, as some people may be inclined. If I didn't address the self-determination aspect, can you clarify that portion for me?