Final answer:
A document that appoints someone to make medical decisions on your behalf is known as a medical power of attorney, which is different from a living will or a DNR order.
Step-by-step explanation:
A document that appoints someone you trust to make medical decisions for you is called a medical power of attorney. This is distinct from a living will, which is a legal document that details the specific medical interventions you want or do not want, such as a Do Not Resuscitate (DNR) order. The health care proxy included in a living will, also known as a medical power of attorney, entrusts a chosen person with the authority to make healthcare decisions on your behalf if you become unable to communicate your wishes directly.