A health surrogate is a person authorized to make medical decisions on your behalf when you cannot make or communicate those decisions yourself. You might also hear the terms “healthcare proxy,” “healthcare agent,” or “medical representative,” which all describe the same role. The surrogate steps in only when a physician determines you lack the capacity to understand and participate in your own care decisions, whether temporarily after an accident or permanently due to a condition like advanced dementia.
How a Health Surrogate Differs From Other Legal Roles
People often confuse a health surrogate with a financial power of attorney, but the two roles are completely separate. A health surrogate can decide which doctors or facilities you work with, whether to proceed with surgery, what drug treatments to pursue, and how aggressively to treat a serious illness. A financial power of attorney, by contrast, handles money: bank withdrawals, bill payments, real estate transactions. You can name the same person for both roles, but you don’t have to, and many people intentionally choose different individuals for each.
A health surrogate is also distinct from a living will. A living will is a written document that records your specific treatment preferences, such as whether you want to be kept on life support. A health surrogate is a person who interprets and applies those preferences in real time, responding to situations your living will may not have anticipated. Even in the three states that don’t formally recognize living wills (Massachusetts is one), a written statement of your wishes still serves as a guide for your surrogate and medical team.
How to Designate a Health Surrogate
You designate a health surrogate through an advance directive document called a durable power of attorney for health care. You sign and date this form, and it must be witnessed by two adults. Neither witness can be your designated surrogate, and at least one witness cannot be your spouse or a blood relative. Some states also require notarization, so checking your state’s specific rules through a local legal aid office or bar association is worthwhile.
On the form, you can include instructions that limit or expand your surrogate’s authority. For instance, you might specify treatments you never want, or you might give your surrogate broad discretion to decide based on circumstances. The more guidance you provide, the easier it is for your surrogate to act with confidence when the moment comes.
Who Can Serve as a Health Surrogate
Most states require a health surrogate to be a legal adult with the mental capacity to make decisions. Beyond that, the American Bar Association generally recommends against choosing certain people, including your treating physician or anyone who might have a conflict of interest. Many people choose a spouse, adult child, sibling, or close friend.
The best surrogate is someone who knows your values well, can handle stressful conversations with medical teams, and is willing to honor your wishes even if they personally disagree. This is worth a direct conversation. Naming someone without discussing your preferences ahead of time puts them in an incredibly difficult position during what will already be one of the hardest moments of their life.
When the Surrogate’s Authority Activates
A health surrogate does not have any authority while you can still make your own decisions. The role activates only after your attending physician determines, to a reasonable degree of medical certainty, that you lack “decisional capacity,” meaning you cannot understand the nature and consequences of a medical decision and communicate an informed choice. The physician documents this determination in your medical record, noting the cause, nature, and expected duration of your incapacity.
For routine medical decisions, a single physician’s determination is typically sufficient. But for decisions about life-sustaining treatment, the bar is higher. In Illinois, for example, at least one additional physician must independently examine you and concur in writing that you lack decisional capacity. The attending physician must also certify in writing that you have a “qualifying condition,” such as a terminal illness, permanent unconsciousness, or an incurable condition that imposes severe suffering with no reasonable prospect of recovery.
If you regain capacity at any point, your surrogate’s authority pauses and you resume making your own decisions.
How Surrogates Are Expected to Decide
Surrogates follow a widely accepted hierarchy when making decisions. The first priority is your known wishes: if you left explicit instructions about a specific scenario, the surrogate follows them. When your instructions don’t cover the situation, the surrogate uses what’s called “substituted judgment,” essentially asking, “What would this person choose, based on their values, beliefs, and past decisions?” Only when there’s no way to determine what you would have wanted does the surrogate fall back on a “best interest” standard, choosing whatever a reasonable person would consider most beneficial given the circumstances.
This hierarchy matters because it keeps the focus on you as an individual rather than on what the surrogate personally prefers. A surrogate who is deeply religious might still need to honor a patient’s documented wish to decline aggressive treatment, for example. The role requires setting aside your own feelings to faithfully represent someone else’s.
What Happens When There’s a Disagreement
Conflicts sometimes arise between surrogates and physicians, or among family members who disagree with the surrogate’s choices. Most hospitals address these situations through an ethics committee consultation first, where a neutral group reviews the case and offers guidance. If that doesn’t resolve things, mediation is an option. In mediation, a neutral third party helps both sides negotiate toward an agreement without going to court. The mediator doesn’t make a final ruling, and either party can walk away and pursue legal action if mediation fails.
Court intervention is the last resort. Historically, these disputes have been settled through the legal system, but courts are slow, adversarial, and often poorly suited to the nuanced realities of medical decision-making. The best way to prevent these conflicts is to have clear written instructions and to make sure your surrogate, your family, and your physician all know your wishes before a crisis occurs.
What Happens Without a Designated Surrogate
If you become incapacitated without having named a surrogate, most states have a default priority list that determines who can make decisions for you. This typically starts with a spouse, then moves to adult children, parents, siblings, and other relatives. The exact order varies by state. Without a designated surrogate, you lose control over who speaks for you, and disagreements among family members become more likely. Completing the paperwork while you’re healthy takes a small amount of time and eliminates a significant amount of uncertainty for the people who care about you.