What is an advance directive?
An advance directive is a legal document that does two jobs at once: it names a healthcare agent to make medical decisions for you if you can't, and it records your own treatment wishes for the end of life. In most states it's a single statutory form that folds a medical power of attorney and a living will together, which is why it's the document most people need.
Because it names an agent, an advance directive keeps working in situations a living will can't foresee: your agent can weigh a real, unfolding medical decision against your stated wishes, rather than leaving doctors to interpret a checklist alone.
When do you need one?
Planning ahead so someone you trust can speak for you if illness or injury leaves you unable to
Making your wishes about life support and resuscitation known before a crisis
Sparing your family from guessing, or fighting, about your care
Being admitted to a hospital or long-term care facility, which will ask if you have one
What it should include
Your agent: the person authorized to make medical decisions, plus an alternate
Your wishes: what you want regarding CPR, ventilation, dialysis, and artificial nutrition
Limits and values: any treatment you refuse, and what "quality of life" means to you
Organ donation and comfort care: optional but common statutory sections
Signatures: yours plus the witnesses or notary your state requires
State quirk that trips people up: Massachusetts, Michigan, and New York have no living-will statute. There, the recognized document is the healthcare proxy (agent), your written wishes still guide the agent, but the proxy is what's legally operative. Our state pages build the right form for each.
Advance directive vs living will vs medical POA vs DNR
A living will is only your wishes and names no one. A medical power of attorney only names an agent. An advance directive combines both. A DNR is different in kind: it's a medical order a physician signs so EMTs and hospitals withhold CPR. You can want all of these; they don't conflict.
The federal law behind advance directives
The reason nearly every hospital admission packet asks about advance directives isn't a facility's own policy, it's federal law.
The Patient Self-Determination Act (PSDA), part of the 1990 Omnibus Budget Reconciliation Act and codified at 42 U.S.C. § 1395cc(f), requires hospitals, nursing homes, home health agencies, hospices, and HMOs that participate in Medicare or Medicaid to tell you in writing, at admission, about your right under state law to accept or refuse treatment and to complete an advance directive.
Those facilities also have to ask whether you already have one, note it in your medical record, educate their staff on the topic, and cannot condition your care on whether you've signed one. State law still defines what a valid directive looks like, the PSDA just guarantees you're told about the option and can't be penalized for using it.
Capacity, mental health directives, and revocation
To sign a valid advance directive, you generally need decision-making capacity: the ability to understand what the document does and communicate a choice at the time you sign.
Capacity is presumed unless there's evidence otherwise, so a diagnosis alone (dementia, mental illness) doesn't automatically disqualify you.
You can revoke or replace your directive any time you still have capacity, most states impose no waiting period or required form for revocation, though putting it in writing and telling your agent and providers is the safer route than relying on a verbal statement alone.
Many states also recognize a separate mental health (psychiatric) advance directive, covering preferences like which medications you're willing to take, hospitalization preferences, and who can be told about your care during a mental health crisis.
The Uniform Law Commission's 2023 revision of the Uniform Health-Care Decisions Act (UHCDA) folds mental health directives into the same legal framework as end-of-life directives for states that adopt it, so check whether your state form addresses mental health care separately.
Will other states honor my directive?
Not automatically, but usually in practice. About half the states have adopted some version of the UHCDA, which includes an explicit provision recognizing a directive that was validly executed under another state's law.
In states that haven't adopted it, a receiving hospital typically applies its own state's law to decide whether an out-of-state directive is valid, and often falls back on general comity principles, honoring the document if it substantially complies with local formalities, even if it isn't a perfect match.
The safest approach if you split time between states, or move, is to sign a new directive using your current state's statutory form and keep the old one only as a backup statement of your wishes.
Common mistakes to avoid
Naming an agent without ever discussing your wishes with them
Not naming an alternate agent in case your first choice is unavailable
Using witnesses your state disqualifies, often your agent, your heirs, or facility staff
Assuming a directive expires and needs periodic re-signing (it doesn't, but review it after major life or health changes)
Keeping the only signed copy somewhere no one can access in an emergency
Moving to a new state and never checking whether your old directive still fits local formalities