Health: patient directives; Michigan medical treatment decisions act; enact. Creates new act.

SB 482 creates the "Michigan Medical Treatment Decisions Act," establishing a clear process for who can make medical decisions for adults (18+) unable to do so themselves. It sets a priority order for decision-makers: spouse, adult children, parents, siblings, grandparents, or a designated "surrogate" (a concerned relative/friend), with physicians as a last resort if no one else is available. The law requires decision-makers to follow the patient’s known wishes or best interests, but explicitly prohibits authorizing life-sustaining treatment withdrawal, sterilization, pregnancy termination, or specific facility admissions. This directly affects patients in medical crises and the family/friends designated to act on their behalf.