Understanding the Terms of Health Care Directives
Advance directive, POLST, AHCD, healthcare proxy — these terms are often used interchangeably, but they mean different things. Here's what each one is and when you need it.
Why these terms matter — and why they confuse people
When a family member becomes seriously ill or a loved one loses the ability to speak for themselves, the documents that govern their medical care become critically important. But the language surrounding these documents — "advance directive," "living will," "healthcare proxy," "POLST," "AHCD" — is used so inconsistently by hospitals, doctors, and even attorneys that most people aren't sure what they actually have or what it actually does.
This guide defines each term clearly, explains how the documents relate to one another, and explains what's required to make them legally valid in California. Understanding these distinctions isn't just an academic exercise — it can determine whether your wishes are honored in an emergency.
The umbrella term: advance directive
"Advance directive" is not the name of a specific document. It's an umbrella term for any legal document that expresses a person's wishes about medical care in advance — before a crisis occurs and before they may be unable to speak for themselves.
In California, the two primary documents that fall under this umbrella are:
- The Advance Health Care Directive (AHCD) — a statutory form covering both treatment instructions and the appointment of an agent
- The POLST (Physician Orders for Life-Sustaining Treatment) — a medical order for people already dealing with serious illness
A living will is also a type of advance directive, though California uses the AHCD form rather than a separate living will document. Understanding this distinction prevents confusion when a hospital asks whether you have an "advance directive" on file — they're asking about either or both of these documents.
The key terms, defined
California's primary advance planning document, authorized under the California Probate Code §4700–4806. The AHCD does two things in one form: it allows you to name a healthcare agent (the person who makes decisions on your behalf), and it allows you to write out your specific wishes about treatment, resuscitation, and end-of-life care.
You don't need both parts — you can complete just the agent appointment, just the treatment instructions, or both. Most estate planning attorneys recommend completing the full form.
To be legally valid in California, the AHCD must be either notarized by a California Notary Public or signed in the presence of two qualified adult witnesses. The witnesses cannot be your healthcare agent, your heirs, your healthcare provider, or the operator of a healthcare facility where you're a patient.
Your healthcare agent is the person you authorize to make medical decisions on your behalf if you're unable to do so yourself. This authority is granted through the AHCD — there's no separate "healthcare proxy" document in California.
The agent's authority is broad: they can consent to or refuse any medical treatment, choose your healthcare providers, access your medical records, and make end-of-life decisions — but only the decisions you haven't already specified in the directive itself. Your written instructions always take precedence over your agent's judgment.
Choosing this person carefully is one of the most important decisions in any estate plan. They should understand your values deeply, be capable of making difficult decisions under pressure, and be geographically accessible in an emergency.
Technically, the section of the AHCD that appoints your healthcare agent is a durable power of attorney for health care — "durable" meaning it remains in effect even if you become incapacitated. In everyday conversation, "healthcare POA" and "AHCD" are often used interchangeably, though they're not quite the same thing.
The critical word is "durable." A regular (non-durable) power of attorney terminates when the principal becomes incapacitated — the exact moment you'd most need it to be active. A durable POA specifically survives incapacitation, which is why all healthcare directives in California are drafted as durable instruments.
Do not confuse this with a Durable Power of Attorney for finances, which is a separate document that governs financial decisions — not medical ones.
A living will is the portion of an advance directive that records your specific wishes about medical treatment — as opposed to the part that names an agent. It answers questions like: Do you want CPR attempted? Do you want to be kept on a ventilator? Do you want artificial nutrition if you're in a persistent vegetative state?
California does not have a separate "living will" form. Instead, this information is captured in Part 2 of the California AHCD. Some other states use a standalone living will document, which is why you may hear the term — but in California, it's simply part of the AHCD.
A POLST is fundamentally different from an AHCD. It is not an advance planning document — it is an active physician's medical order, typically used when a person is already seriously ill, frail, or nearing the end of life. Because it's a medical order, it travels with the patient across care settings and must be honored immediately by emergency responders and healthcare facilities.
The POLST form covers specific immediate decisions: whether to attempt resuscitation (CPR), how much medical intervention to provide, and whether to use artificial nutrition. It is signed by a physician (or nurse practitioner or PA), not just the patient.
An AHCD and a POLST are complementary, not interchangeable. A younger, healthy person needs an AHCD. A person with a serious or terminal illness should have both — with the POLST reflecting current treatment decisions and the AHCD providing broader guidance and appointing an agent.
A DNR (Do Not Resuscitate) is a physician's order directing that CPR not be performed if the patient's heart stops or they stop breathing. A DNI (Do Not Intubate) directs that a breathing tube not be inserted. Both are specific medical orders — not standalone documents someone prepares in advance without physician involvement.
Your wishes regarding resuscitation can be expressed in your AHCD, but they don't become an active medical order until a physician signs the appropriate order (often through the POLST process). An AHCD that says "no CPR" is important guidance for your healthcare agent, but it does not by itself function as a DNR order in an emergency setting.
How the documents compare
| Document | Who signs | Notary needed | Names an agent | When used |
|---|---|---|---|---|
| AHCD | You | ✓ or 2 witnesses | ✓ Yes | Any adult, any age |
| POLST | You + physician | ✗ No | ✗ No | Serious/terminal illness |
| DNR order | Physician | ✗ No | ✗ No | Active medical order |
| Living will | You | ✓ Part of AHCD | ✗ No | Part of AHCD in CA |
| Healthcare POA | You | ✓ Part of AHCD | ✓ Yes | Part of AHCD in CA |
Notarization vs. witnesses — which should you choose?
California gives you a choice: have your AHCD notarized by a California Notary Public, or have it signed in front of two qualified adult witnesses. Both satisfy the legal requirement. Here's how to think about which is right for you.
When notarization is the better choice
- Your document may be presented to institutions outside California — notarization is more universally recognized
- You can't easily find two qualifying witnesses (excluding family members who are heirs, your healthcare provider, and facility operators)
- You want the strongest possible evidence that the signing was legitimate and the principal had capacity
- Your attorney recommends it as the more reliable option
When witnesses may be sufficient
- You need to execute the document quickly in a hospital or care facility
- Two qualifying witnesses are readily available
- Your attorney has specifically advised that witnesses are appropriate in your situation
What to do if you don't have these documents
If you don't have an AHCD in place, California has default rules that govern who can make medical decisions for you — but they may not reflect your wishes. The default hierarchy generally starts with a legal spouse or domestic partner, then adult children, then parents, then siblings. If you have a partner you aren't married to, or if you want someone other than the legal next-of-kin to make decisions, you need an AHCD.
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1Talk to an estate planning attorney An attorney will prepare your AHCD correctly and ensure it reflects your actual wishes. This is not optional if your situation is at all complex — a poorly drafted directive can be worse than none.
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2Choose your healthcare agent carefully This person will make decisions on your behalf in some of the most difficult moments your family will face. Make sure they know your values, can handle conflict with family members if needed, and are willing to serve.
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3Get the document notarized or witnessed Once your attorney has prepared the AHCD, it must be executed properly — either notarized or witnessed by two qualifying adults. A mobile notary can come to your location for this step.
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4Distribute copies to the right people Give a copy to your healthcare agent, your primary care physician, your attorney, and any hospital or care facility where you receive regular treatment. Keep the original somewhere accessible — not locked in a safe deposit box.
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5Review it periodically Life changes — relationships, health conditions, and your own wishes evolve. Review your AHCD whenever you have a major health event, a change in your primary relationships, or at least every five years.
Frequently asked questions
Does a healthcare directive need to be notarized in California?
Not necessarily — you have the option of either notarization or two qualified witnesses. However, notarization is often the more practical and reliable choice, particularly if the document may be used outside California, or if you're a patient in a skilled nursing facility (where a special witness requirement applies that notarization automatically satisfies).
What's the difference between a healthcare directive and a living will?
In California, these refer to the same thing. A living will is the portion of an advance directive that records your specific treatment wishes. California doesn't use a separate "living will" form — instead, treatment instructions are captured in Part 2 of the California Advance Health Care Directive (AHCD).
Can my healthcare agent override my written instructions?
No. Your written instructions in the AHCD always take precedence over your agent's judgment. Your agent makes decisions only when the document doesn't address a specific situation. This is why the written instruction portion of the AHCD matters — the more clearly you've expressed your wishes, the less discretion your agent needs to exercise.
Do I need a POLST if I already have an AHCD?
It depends on your health status. Healthy adults generally only need an AHCD. People with serious illness, frailty, or a terminal diagnosis should have both — the AHCD for broader guidance and agent appointment, and the POLST as an active medical order that emergency responders and care facilities must honor immediately. Talk to your physician about whether a POLST is appropriate for your situation.
Can a notary come to a hospital room to notarize an AHCD?
Yes. The Notary Commander makes regular visits to hospitals, skilled nursing facilities, memory care units, and hospice settings throughout San Francisco and the Bay Area. If your loved one is hospitalized and needs documents signed, same-day visits are available in most cases. Learn more about our hospital notary service.
What happens if I become incapacitated and don't have any of these documents?
California's default rules would govern who makes decisions for you, following a statutory priority order: spouse or domestic partner, then adult children, then parents, then siblings. If you want someone outside this hierarchy to have authority — an unmarried partner, a close friend, a specific family member — you must name them in an AHCD. Without one, you have no say in who speaks for you.
Can I change or revoke my healthcare directive?
Yes, at any time — as long as you have mental capacity. You can revoke an AHCD verbally, in writing, or by destroying the document. If you create a new AHCD, it supersedes the previous one. Always notify your healthcare agent, physician, and any institutions that have copies on file when you make changes.
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