The person who makes medical decisions if you can’t is whoever you name in a healthcare power of attorney. Sign that document while you’re competent, and your chosen agent steps in the moment a doctor determines you can’t speak for yourself. Skip it, and your state’s default surrogate law picks someone for you from a fixed family hierarchy, or, when relatives disagree, sends your family to court for a guardianship before anyone can authorize treatment.
The Document That Names Your Decision-Maker
A healthcare power of attorney, sometimes called a healthcare proxy or medical power of attorney depending on the state, names a specific person to make medical decisions on your behalf when you cannot. It’s distinct from a living will, which spells out the treatments you do and do not want around end-of-life care like ventilators, tube feeding, and resuscitation. Many states bundle both into a single packet called an advance directive.
Of the two, the healthcare power of attorney does more work. A living will only covers the scenarios you thought to write down, and medical situations are unpredictable. Your agent can respond to whatever actually happens, using your living will as evidence of what you’d want when a specific decision gets hard.
What Happens If You Never Name Anyone
If you become incapacitated without a healthcare power of attorney, most states have a default surrogate law that designates who speaks for you. The priority order is broadly similar across states: spouse or domestic partner first, then adult children, then parents, then adult siblings, then more distant relatives. Some states also allow a close friend to serve if no family member is available.
This works fine when one obvious person exists and everyone agrees. It breaks down fast when they don’t. Divorced or separated spouses, estranged children, and blended families produce disputes the statute wasn’t designed to resolve. When family members disagree, the hospital may refuse to proceed with treatment until someone obtains a court-appointed guardianship. That process is slow, expensive, and can delay care during the window when it matters most.1Elder Justice Initiative. Guardianship – Key Concepts and Resources
People who are unmarried, estranged from family, or in relationships their state does not recognize have the most to lose by skipping this paperwork. Without a designation, the person you’d actually choose may have no legal standing at all.
Who You Can Name
Your agent doesn’t need legal or medical training. They need the ability to stand in a hospital hallway, absorb bad news, and make the call you would have made. That requires someone who genuinely understands your values. Plenty of devoted family members freeze under pressure or substitute their own wishes for yours when the moment arrives.
In most states, your agent must be at least 18. Alabama and Nebraska require 19.2National Institute on Aging. Choosing A Health Care Proxy Beyond age, most states prohibit your treating physician, employees of your healthcare facility, or the owner of a residential care home from serving unless they’re also a relative. These restrictions prevent conflicts between your care and the facility’s operations.
Name at least one backup. If your first choice is unavailable, traveling, or emotionally unable to serve, a successor agent keeps the authority from falling into the default hierarchy or a courtroom. Talk to both your primary and backup agents before you finalize anything. An agent who learns about the role for the first time in an ICU waiting room isn’t in a position to advocate effectively.
Signing the Document
Most states provide free advance directive forms through their health department or attorney general’s office, and hospitals typically have them available at admissions. The forms ask for your agent’s full name and contact information, your backup agent’s details, and your treatment preferences.
Execution requirements vary by state but generally fall into two categories: witnessing by two adults, or acknowledgment before a notary public. Many states accept either. Witnesses usually face their own restrictions. Common disqualifications include being named as your agent, being an heir or beneficiary of your estate, and being an employee of the healthcare facility where you’re receiving care. These rules exist to ensure that the people verifying your signature have no financial stake in your medical decisions.
Once signed, give copies to your agent, your backup agent, your primary care doctor, and any hospital where you regularly receive treatment. Keep the original somewhere accessible. A perfectly executed advance directive locked in a safe deposit box at midnight when the ambulance arrives is functionally useless.
When Your Agent’s Authority Turns On
Your agent has no authority while you can still make your own decisions. The power typically activates only when a physician determines you lack the capacity to understand your medical situation and communicate a choice. Some states require written certification from one physician; others require two. Incapacity can be temporary, like being under general anesthesia, or long-term, like advanced dementia or a severe brain injury.
Once you regain capacity, your authority over your own care returns automatically. Your agent cannot continue making decisions for you because they disagree with the choices you’re making. The document is a safety net for incapacity, not a transfer of control.
What Your Agent Can and Cannot Decide
Your agent’s authority covers the full range of healthcare decisions: approving or refusing surgery, medications, and diagnostic tests; choosing doctors and facilities; directing pain management; and making decisions about life-sustaining treatment. The scope can be as broad or as narrow as you define it. If you want to exclude specific types of decisions, write those limitations in.
Your agent is expected to follow your known wishes first. When your specific preferences aren’t known, the agent should decide based on your values and beliefs. This is why the conversation beforehand matters so much. An agent who knows you’d never want to be on a ventilator indefinitely has a clear path. An agent guessing in the dark may agonize over every choice.
A healthcare power of attorney does not give your agent any control over your finances. If you also want someone managing bank accounts, paying bills, or handling insurance claims during your incapacity, that requires a separate financial power of attorney. Some people name the same person for both roles; others split them deliberately to avoid overloading one individual.
Organ and Tissue Donation
Under the Revised Uniform Anatomical Gift Act, adopted in most states, your healthcare agent can consent to organ and tissue donation on your behalf unless your power of attorney specifically prohibits it. If you’ve already registered as a donor through your state’s registry or indicated your wishes on your driver’s license, your own decision takes priority. No one, including your agent, can override a donation decision you made during your lifetime. If organ donation matters to you either way, state it explicitly in your advance directive so your agent isn’t left guessing.
Access to Your Medical Records
Your agent needs your medical history to make informed decisions. Under HIPAA, anyone with legal authority to make healthcare decisions for you is treated as your “personal representative” and must be given access to your protected health information.3eCFR. 45 CFR 164.502 – Uses and Disclosures of Protected Health Information, General Rules Once your healthcare power of attorney is activated, your agent has the same right to your records that you do.
The gap that catches people is the period before incapacity. If your agent is helping you coordinate care while you’re still competent but physically struggling, the healthcare power of attorney alone may not be enough to get them access. A separate HIPAA authorization form, signed while you’re competent, allows a named individual to receive your medical information regardless of whether you’re incapacitated. Many attorneys include this form as a standard part of the advance directive package.
Substance use disorder treatment records receive extra federal protection under 42 CFR Part 2.4eCFR. 42 CFR Part 2 – Confidentiality of Substance Use Disorder Patient Records Even a fully activated healthcare agent may face additional consent requirements before accessing these records, though emergency exceptions exist.
POLST Forms for the Seriously Ill
A POLST form (Physician Orders for Life-Sustaining Treatment, sometimes called MOLST or a similar name) is a different tool and serves a different population. Advance directives are for healthy adults planning ahead. POLST forms are designed for people who are already seriously ill or medically frail and need specific, actionable medical orders that travel with them across care settings.
The critical difference is that a POLST is a medical order signed by a healthcare provider, not a personal legal document. Emergency medical technicians are required to follow POLST orders. They cannot follow advance directives or healthcare powers of attorney, because those are not medical orders. Forty-three states and Washington, D.C. have codified POLST programs into law or established an officially recognized state form. A POLST does not replace your advance directive and does not name a healthcare agent. It works alongside your other documents.
Will Your Document Work in Another State?
Most states have provisions recognizing out-of-state advance directives, but not all do, and the details vary. A directive that meets your home state’s requirements might not satisfy the formalities of the state where you happen to be hospitalized. In practice, healthcare providers generally try to honor any reasonable advance directive regardless of where it was executed, because the alternative is ignoring a patient’s clearly expressed wishes. “Generally try to honor” is not the same as “legally required to follow.”
If you spend significant time in more than one state, the safest approach is to execute an advance directive that complies with each state’s requirements. At minimum, include both witnesses and notarization, since that combination satisfies the formality requirements in the widest range of states. Keep copies accessible in every location where you receive care.
Changing or Revoking Your Choice
You can change or cancel your healthcare power of attorney at any time, as long as you have the mental capacity to do so. The simplest method is to sign a new document, which automatically supersedes the old one. You can also revoke the existing document in writing, physically destroy it, or in most states simply tell your doctor verbally that you’re revoking it. Oral revocation is accepted in many jurisdictions precisely because the situations prompting a change of heart don’t always allow time for paperwork.
After any change, notify your former agent, your new agent, every healthcare provider who has a copy of the old document, and any hospital where your directive is on file. An outdated directive sitting in a hospital’s records can create serious confusion during a crisis, especially if it names someone you no longer trust.
Review your designation after major life events: marriage, divorce, a death in the family, or a serious diagnosis that changes your treatment preferences. Even without a triggering event, a quick annual check confirms that the person you named five years ago is still the right choice and still willing to serve.