# Advance Healthcare Directive: Definition and How It Works in California

> An advance healthcare directive names a healthcare agent and states a person's wishes for medical treatment if they can no longer decide.

Source: https://ridleylawoffices.com/estate-planning-glossary-california/advance-healthcare-directive/

By Eric Ridley, attorney, Ridley Law. Updated September 2026.

An **advance healthcare directive** names a healthcare agent and states a person’s medical treatment wishes for use if they can no longer decide for themselves.

## How it works in California

California has a statutory form for this document under Prob. Code, § 4701, though a directive doesn’t have to use that exact form to be valid. It’s usually signed, as an [advance healthcare directive](https://ridleylawoffices.com/advance-healthcare-directive-attorney/), alongside a durable power of attorney and other incapacity planning documents, naming an agent and, often, alternate agents in case the first choice can’t serve.

The document does two things. It appoints an agent to make healthcare decisions on the person’s behalf, and it can state instructions directly, such as end-of-life preferences, so the agent isn’t guessing. Some people also use a POLST or a narrower living will for a specific set of end-of-life wishes; those documents work differently and aren’t interchangeable with a full directive.

## Why it matters

Without a signed directive, a hospital may look to a spouse or adult children to make decisions, but disagreement among family members, or a family structure the default rules don’t anticipate, such as a long-term partner who isn’t a spouse, can leave no one with clear authority. The directive settles that question in advance, in the person’s own words.

## Common mistakes

People sign a directive once and never tell the named agent where to find it or what they’d actually want, which leaves the agent guessing anyway. Others name an agent who lives far away or who they know would struggle to make a hard call in the moment. It’s also common to skip naming an alternate agent, so the whole plan depends on one person always being available.

## Related terms

- [Conservatorship](https://ridleylawoffices.com/estate-planning-glossary-california/conservatorship/): a court proceeding that becomes more likely, not less, when no one has clear authority to make decisions for an incapacitated person.
- [HIPAA Authorization](https://ridleylawoffices.com/estate-planning-glossary-california/hipaa-authorization/): a separate document that lets someone see medical records, which an agent may need even with a signed directive in hand.
- [Power of Attorney](https://ridleylawoffices.com/estate-planning-glossary-california/power-of-attorney/): handles financial decisions the same way a directive handles medical ones.
- [Living Will](https://ridleylawoffices.com/estate-planning-glossary-california/living-will/): a written statement of the medical treatment a person wants, usually part of an advance health care directive.
- [POLST](https://ridleylawoffices.com/estate-planning-glossary-california/polst/): a medical order for a seriously ill patient, signed with a clinician, covering life-sustaining treatment.

Part of the [California estate planning glossary](https://ridleylawoffices.com/estate-planning-glossary-california/). For the full treatment, see [AHCD vs Living Will vs POLST – A California-Specific Guide to End-of-Life Documents](https://ridleylawoffices.com/ahcd-vs-living-will-vs-polst-california/).