Short answer: Under A.R.S. 36-3231, providers follow your written health care directive first. For decisions it does not cover, the agent named in your health care power of attorney acts as your surrogate — unless a court has appointed a guardian for the express purpose of making health care decisions, in which case that guardian takes priority over the agent. If you have neither an agent nor a healthcare guardian, the statutory surrogate list applies: spouse (unless legally separated), then adult children (by majority), parent, domestic partner if unmarried, sibling, and close friend. Your spouse is the default decision-maker only when you have not named an agent yourself.
Can My Spouse Make Medical Decisions for Me in Arizona?
Yes — in most marriages, your spouse can make medical decisions for you in Arizona if you become incapacitated and have not named a different agent. Under A.R.S. 36-3231(A)(1), the spouse sits at the top of the surrogate list, unless the spouses are legally separated. That means hospitals will turn to your spouse first whenever there is no health care power of attorney and no court-appointed guardian.
But "can" is not the same as "will, with no friction." Your spouse's authority as a surrogate is statutory — not contractual — so it can be challenged by another family member, slowed down at the hospital, or limited for certain decisions (mental health admissions, for example, are restricted under A.R.S. 36-3231(D)). Naming your spouse as your agent in a written health care power of attorney removes the ambiguity and gives them broader authority than the surrogate statute alone.
Who Makes Medical Decisions If You Are Married but Have No Documents?
If you are married in Arizona and have no health care power of attorney, no living will, and no court-appointed guardian, the surrogate hierarchy in A.R.S. 36-3231 controls. Your spouse decides first. If your spouse is unavailable, unwilling, or legally separated from you, the law moves down the list: adult children (majority of those reasonably available must agree), parent, domestic partner, sibling, then a close friend who knows your wishes.
A common Arizona scenario: a married adult is hospitalized after an accident. The spouse asserts authority. An adult child from a prior marriage disagrees about the treatment plan. Without documents, the dispute lands at the hospital ethics committee or in court. With a health care power of attorney that names a single agent, the hospital follows the agent — full stop.
If You Have a Health Care Power of Attorney
A health care power of attorney is the strongest tool for naming a medical decision-maker. Under A.R.S. 36-3221, any Arizona adult can pick another adult to make health care choices for them. Your named agent can approve or refuse treatments, choose doctors and care centers, and make long-term care decisions. The agent only steps in when you cannot make or communicate decisions yourself.
The document must be in writing, dated, signed, and either notarized or witnessed. Arizona law limits who can serve as a witness. The witness cannot be your named agent or someone involved in your care at the time you sign. If you use a single witness instead of a notary, that witness cannot be a relative or someone who would inherit from your estate.
One narrow exception applies under A.R.S. 36-3231(A): if a court has already appointed a guardian for the express purpose of making your health care decisions, that guardian acts as your surrogate and takes priority over your named agent. In normal practice this is rare — courts only appoint a healthcare guardian when no valid agent exists or there is a serious dispute about the agent's authority — but it is the one situation where a healthcare power of attorney can be displaced.
If You Have a Living Will (Health Care Directive)
A living will does not name a decision-maker. Instead, it gives written instructions about the care you want or do not want at the end of life. If you are terminally ill, in a lasting vegetative state, or in an irreversible coma, your directive tells the medical team what to do.
Under A.R.S. 36-3209, if your directive conflicts with a physician's order, your directive is presumed to represent your wishes. If you signed more than one directive over the years, the most recent version controls.
If You Have No Documents: Arizona's Surrogate Priority List
When there is no health care power of attorney and no directive, Arizona law has a backup. Under A.R.S. 36-3231, a surrogate steps in. The priority list is:
- Your spouse (unless legally separated)
- An adult child (majority of those reasonably available must agree)
- A parent
- A domestic partner (if you are unmarried)
- A brother or sister
- A close friend who knows your values and health care wishes
If more than one person at the same level disagrees, the physician usually follows the majority. If there is no majority, the physician follows the person they believe best knows your wishes. If no one on the list can be located, your attending physician may proceed after consulting an institutional ethics committee or a second physician.
Why the Surrogate System Is Not Enough
The surrogate list sounds fair. In practice it creates real problems. Family members disagree about what you would want. A sibling may see things differently than your adult child. A blended-family spouse may clash with a child from a prior marriage. And if no one on the list is willing or available to serve, the hospital may have to go to court for a guardianship.
A court-appointed guardian can make medical choices for you, but the process is slow, costly, and public. It also puts a stranger — the judge — in charge of picking who speaks for you. That is not what most Arizonans want.
The Three Documents That Work Together
The best approach uses three documents together:
- Health care power of attorney (A.R.S. 36-3221) to name your decision-maker
- Living will (A.R.S. 36-3261) to state your end-of-life care wishes
- HIPAA authorization to give your agent access to your medical records
Together, these make sure the right person can act fast when you cannot. They remove guesswork. They prevent family fights. They keep the courts out of your medical care.
Having these documents in place is one of the most important steps any Arizona adult can take. It costs far less than a guardianship case, and it gives you peace of mind that your wishes will be followed. That is the smart play.