You can talk about an advance directive with your health care professional, and he or she can help you fill out the forms, if you want to. An advance directive is a legal document that records your wishes about medical treatment at a future time, if you’re not able to make decisions about your care. You pay nothing if the doctor or other qualified health care provider accepts assignment.
Note: Medicare may also cover this service as part of your medical treatment. When Advance Care Planning isn’t part of your Annual “Wellness” visit, the Part B deductible and coinsurance apply.
Source: Medicare & You 2017