CA Living Will Guide: Protect Your Autonomy

Short answer: A living will, more precisely called an advance health care directive under California Prob. Code §4605, lets you put your medical treatment wishes in writing and name someone to make health care decisions for you if you become unable to make them yourself. Without one, doctors and hospitals default to providing whatever treatment is available to keep you alive, and your family is left guessing, or arguing, about what you would have wanted. It is a document for any competent adult, not just people who are elderly or already seriously ill.

What does an advance health care directive actually cover?

Under Prob. Code §4605, an advance health care directive can be either a health care instruction, a power of attorney for health care, or both combined into one document. California gives you a statutory form to use, but nothing requires you to use it, so an attorney can draft something more tailored to your situation if the fill-in-the-blank version does not fit.

Whichever version you use, Prob. Code §4701 lays out a four-part structure: a power of attorney for health care naming your agent, written instructions about the treatment you do or do not want, an organ donation election, and a section naming your primary physician. You do not have to fill in every part. But the form is built so that naming an agent and writing down your wishes happen in the same document, instead of two separate ones.

How is this different from a financial power of attorney?

A health care directive and a financial power of attorney are not the same document and do not live in the same part of the Probate Code. The health care directive sits in Division 4.7. A financial power of attorney sits in Division 4.5, and it covers your money, property, and business affairs rather than your medical care.

The financial side has its own rules about when authority starts and stops. A durable financial power of attorney, governed by Prob. Code §4124, keeps working even after you lose capacity, which is the entire point of naming someone in advance. A non-durable power of attorney does the opposite. Under Prob. Code §4155, a non-durable power of attorney terminates the moment you become incapacitated, which is usually exactly the moment you need it most. A complete incapacity plan needs both pieces done correctly, someone authorized to handle your finances and someone authorized to handle your health care, because one document rarely covers both well. See our power of attorney page for how the two pieces fit together.

When does your agent’s authority actually kick in?

By default, under Prob. Code §4701, Part 1.3, your agent’s authority to make health care decisions starts once your physician determines you lack the capacity to make those decisions yourself. You are not required to use the default. You can specify that your agent’s authority begins immediately upon signing, which some people prefer if they travel frequently or want their agent involved in decisions well before any capacity question arises.

There are limits on what even a fully authorized agent can do. Prob. Code §4652 lists what an advance health care directive cannot authorize regardless of how it is worded: commitment to a mental health facility, convulsive treatment, psychosurgery, sterilization, and abortion. Those decisions stay outside the directive no matter what instructions you write.

Who decides if you never signed a directive?

If you become unable to communicate and there is no directive on file, California law still provides a fallback. Prob. Code §4712 sets a priority order for who can act as your surrogate decision maker, typically starting with a spouse or registered domestic partner and moving down through adult children, parents, and other relatives. Whoever qualifies under that list is bound by Prob. Code §4714 to follow your known wishes if you expressed any, or otherwise to act in your best interest.

The surrogate process works without going to court. Prob. Code §4750 makes an advance health care directive, and by extension the surrogate framework built around it, effective without judicial approval. That sounds efficient, and it can be. But it also means the surrogate hierarchy is a legal default, not a plan. It hands decision-making authority to whoever ranks highest on a statutory list, not necessarily the person you would have chosen, and it gives that person almost no guidance if you never wrote down what you actually wanted.

This is where families get stuck. Spouses, adult children, and siblings do not always see end-of-life decisions the same way, and the statutory hierarchy does not resolve a disagreement between two people who rank equally, such as adult children with no named agent to break the tie. A signed directive removes that ambiguity by naming one person with clear authority, instead of leaving it to a list.

Who needs to sign one, and what does signing require?

Every competent adult, not just people with a serious diagnosis or advanced age. Incapacity can come from a car accident, a stroke, a surgical complication, or any number of events that have nothing to do with how old you are or how healthy you were the day before.

Prob. Code §4701, Part 5, sets the execution requirements: the directive must be signed and dated, and it must either be witnessed by two qualified witnesses or notarized. Skip that step and the document is not valid no matter how clearly it states your wishes.

An advance health care directive works alongside your other planning documents, not instead of them. A will or living trust addresses what happens to your property after you die. A directive addresses decisions made while you are alive but unable to speak for yourself. Most complete estate plans include both, because they solve two different problems.

Figures verified July 2026.

What to do next

If you do not currently have an advance health care directive, that is worth fixing before you need one, not after. Talk to an estate planning attorney about who should serve as your health care agent, what your treatment preferences actually are, when you want your agent’s authority to start, and how to get the document signed and witnessed or notarized the way California law requires. Ridley Law can walk you through the whole process, from choosing an agent to executing the paperwork correctly. See our process page for what that looks like, or call 805-244-5291. It is a short conversation now that avoids a much longer, harder one for your family later.