Nebraska
Nebraska’s Health Care and Treatment Decisions statute allows you to appoint an agent (called an “Attorney in fact”) to make healthcare decisions for you if you become incompetent to make those decisions yourself. “Health care” may include mental health care.  A recommended form for this purpose, called a Power of Attorney, is available here  . The form is not mandatory but is helpful because you must in any event follow the formalities listed in the statute.  Nebraska Advocacy Services has published some helpful further information, available here .