Final answer:
A plan indicating one's preference for future health care decisions is called a living will or advance directive. It details specific interventions a person wants and can include a health care proxy to make decisions on their behalf.
Step-by-step explanation:
A plan indicating one's preference for future health care decisions is called a living will or advance directive. It is a written legal document that details specific interventions a person wants, such as whether they would like to receive life-extending treatments. A living will can also include a health care proxy, which appoints a specific person to make medical decisions for the individual if they are unable to communicate their wishes.