A health care proxy is a person you legally designate to make medical decisions on your behalf if you become unable to communicate your own wishes. This could happen after a serious car accident, a stroke, or any medical event that leaves you incapacitated. Your proxy (also called a health care agent, surrogate, or representative) steps in only when you cannot speak for yourself, and their authority ends when you regain the ability to make your own decisions.
How a Health Care Proxy Works
The core idea is simple: you pick someone you trust, fill out a legal form, and that person gains the right to speak with your doctors and make treatment decisions if you’re ever too sick to do so yourself. The form you need is called a durable power of attorney for health care, and each state has its own version. You can find and download your state’s form for free online.
Your proxy has no authority while you’re conscious and able to communicate. It only activates when you can’t express your own preferences. Once activated, your proxy can consent to or refuse treatments, discuss your care with medical professionals, and access your medical records. Under federal privacy law, a person with legal authority to make health care decisions for you is treated as your personal representative and has the same right to your health information that you would have yourself.
Who Can Be Your Proxy
Your proxy can be a spouse, adult child, sibling, close friend, or anyone you trust to carry out your wishes. The person does not need medical or legal training. In most states, the agent must be at least 18 years old and cannot be someone prohibited by state law from serving in that role (some states restrict your treating physician, for example).
The most important quality in a proxy isn’t medical knowledge. It’s willingness to honor what you would want, even under emotional pressure. That means choosing someone who understands your values around quality of life, pain management, and life-sustaining treatment, and who can advocate firmly with medical staff during a crisis.
Naming an Alternate Agent
You can and should appoint an alternate agent in case your first choice is unavailable, unable, or unwilling to act when the time comes. The alternate steps in automatically under those circumstances. Without a named alternate, health care providers will follow whatever instructions you gave while you were still able to communicate, but there may be no one authorized to handle decisions you didn’t anticipate. New York’s official proxy form, for example, includes a specific line for an alternate agent’s name, address, and phone number.
Health Care Proxy vs. Living Will
These two documents serve different purposes and work best together. A living will is a written statement of your specific medical wishes: which treatments you want, which you don’t, and under what circumstances. It does not name anyone to make decisions for you. A health care proxy names a decision-maker but doesn’t necessarily spell out every medical scenario in detail.
The strength of a living will is its specificity. It can serve as clear evidence of your wishes, and hospitals can follow it without further legal proceedings. The strength of a proxy is flexibility: a real person can respond to situations you never predicted. A living will also tends to be more portable across state lines, since it’s simply a declaration of personal wishes, while a health care proxy is a creature of state law and may not be recognized the same way in every jurisdiction.
If you have both documents, make sure they don’t contradict each other. Any inconsistency between a living will and a proxy form can create confusion and cast doubt on your true intentions, potentially delaying care at the worst possible time. Your proxy can use your living will as a guide, so the two documents should reinforce each other rather than compete.
Making It Legal
Requirements vary by state, but the general process involves signing the form and having it witnessed. Some states require notarization. Illinois, for instance, requires your signature and at least one witness signature on the statutory form, though nonstatutory forms in that state don’t need to be witnessed as long as they meet basic requirements (naming an agent, specifying their powers, and being signed by you). Some states now accept electronic signatures as well.
Once signed, give copies to your proxy, your alternate agent, your primary care doctor, and any hospital where you regularly receive care. Keep the original somewhere accessible. A proxy form locked in a safe deposit box that no one can reach during an emergency defeats the purpose.
Changing or Revoking Your Proxy
You can revoke a health care proxy at any time, for any reason, as long as you’re mentally competent. There are three standard ways to do it: sign a written revocation stating you’re canceling the document, execute a new health care power of attorney (which automatically replaces the old one), or communicate your intent to revoke in any other clear manner.
The critical step people miss is notification. A revocation only becomes effective once you communicate it to each agent named in the original document and to your attending physician. If your old proxy and your doctors don’t know you’ve made a change, they may still act on the outdated form. Update everyone involved, and replace copies of the old document wherever you distributed them.
Why It Matters Before You Need It
Most people think about advance care planning in the context of aging or terminal illness, but the situations that trigger a proxy are often sudden: a car accident, an unexpected stroke, complications during surgery. Roughly a quarter of medical decisions for hospitalized adults are made by someone other than the patient. Having a proxy in place before an emergency means the person making those calls is someone you chose, someone who knows your values, rather than a default decision-maker assigned by state law or a medical team working without guidance.
The conversation with your proxy matters as much as the paperwork. Talk through the scenarios that concern you most: whether you’d want to be kept on life support with no chance of recovery, how you feel about feeding tubes, what quality of life means to you. The more clearly your proxy understands your thinking, the more confidently they can act on your behalf when it counts.