Which statement by the client shows an understanding of living wills?

The statement that demonstrates an understanding of living wills is that the living will directs medical care when the individual is unable to make decisions for themselves. A living will is a specific type of advance directive that outlines a person's preferences for medical treatment in situations where they may be unable to communicate their wishes, such as in the case of terminal illness or incapacitation. It serves as a guideline for healthcare providers to ensure that a person's treatment aligns with their values and choices, even when they cannot express them.

In contrast, the other statements reflect misunderstandings about living wills. For example, the necessity of a nurse co-signing a living will is not a requirement; living wills are valid once signed by the individual alone, following any state-specific laws. Furthermore, the idea that a living will cannot be changed after signing is incorrect, as individuals have the right to modify or revoke their living wills at any time. Lastly, while Medicare may cover certain aspects of advanced care planning, a living will is not a prerequisite for Medicare admission. Understanding these aspects reinforces why the first statement accurately reflects the purpose of a living will.