A Missouri healthcare power of attorney is a written document, authorized under sections 404.800 through 404.865 of the Missouri Revised Statutes, that names another adult to make medical decisions for you if you lose the ability to make them yourself. The person you name is called your attorney-in-fact. Missouri does not have a default statutory hierarchy of surrogate decision-makers when no advance directive exists, so signing this document is the main way to control who speaks for you in a hospital.
Who Can Sign and Who You Can Name
Any mentally competent adult in Missouri can create one. The statute defines “incapacitated” as someone who, because of a physical or mental condition, cannot receive and evaluate information or communicate decisions well enough to meet their own basic needs for food, shelter, safety, or other care.1Missouri Revisor of Statutes. Missouri Revised Statutes 404.805 – Definitions If you don’t meet that standard, you have capacity to sign.
Your choice of agent has one significant restriction. Your attending physician, any employee of your attending physician, and any owner, operator, or employee of a healthcare facility where you live cannot serve as your attorney-in-fact. Two exceptions apply: the person is a close relative within the second degree (spouse, parent, child, sibling, grandparent, or grandchild), or the person belongs to the same religious community as you and is actively engaged in religious or charitable ministry or healthcare services.2Missouri Revisor of Statutes. Missouri Revised Statutes 404.815 – Physician, Health Care Facility, Not to Serve as Attorney in Fact, Exceptions Outside those situations, pick someone who is not involved in your current medical care.
Executing a Valid Document
The document must be in writing. You sign it yourself, or if you’re physically unable to sign, another person can sign in your presence and at your direction. Missouri’s general durable power of attorney requirements in Chapter 404 apply here, so following the standard execution formalities is essential to enforceability. In practice, that means having the document notarized or witnessed to establish that you signed voluntarily and understood what you were authorizing.
Talk to your prospective agent before you sign. The document can spell out specific treatments you want or refuse, but no document anticipates everything. When something the paperwork doesn’t cover comes up, your agent will be making judgment calls, and those go better after a real conversation about your values and priorities.
When Your Agent’s Authority Starts and Stops
Unless the document says otherwise, your agent’s authority does not begin the moment you sign. It begins only after two licensed physicians examine you and certify in writing that you are incapacitated and will remain so for the period during which treatment decisions need to be made. One of those physicians can be your attending doctor.3Missouri Revisor of Statutes. Missouri Code 404.825 – Determination of Incapacity
The certification has to follow accepted medical standards and be incorporated into your medical records, including the specific facts supporting the finding and the expected duration of your incapacity. Even where a document requires two physicians, the statute confirms that at least one physician’s certification is always required.3Missouri Revisor of Statutes. Missouri Code 404.825 – Determination of Incapacity If you later regain capacity, a physician certifies that, and your agent’s authority stops.
You can override the default timing. The statute lets you expressly authorize the power to take effect immediately or on some other trigger. Some people prefer immediate effect so their agent can talk to doctors before any formal incapacity finding; others prefer the two-physician safeguard. Either approach is valid so long as the document clearly states your choice.
What Your Agent Can Decide
Once the authority is active, your attorney-in-fact can generally make the same medical decisions you would make: consenting to or refusing treatments, choosing doctors and specialists, and deciding where you receive care. You control the scope by what you write into the document. You can grant broad discretion or limit your agent to specific categories of decisions.
Your agent is also your personal representative under the federal HIPAA privacy rules. Under 45 CFR 164.502(g), a person with legal authority to make healthcare decisions for an adult must be treated by covered providers and insurers as the patient for purposes of accessing protected health information.4eCFR. 45 CFR 164.502 – Uses and Disclosures of Protected Health Information Hospitals and doctors must share your records with your agent while the power of attorney is active. Without that access, your agent would be deciding blind.
Special Rules for Artificial Nutrition and Hydration
This is where Missouri law is stricter than most states, and where the details matter most. If you want your agent to be able to direct a provider to withhold or withdraw artificially supplied nutrition and hydration, you must specifically grant that authority in the document. A general grant of healthcare decision-making power is not enough. If the document is silent, your agent cannot make that call.5Missouri Revisor of Statutes. Missouri Code 404.820 – Withdrawing or Withholding Treatment, Specific Authority Required, Restrictions
Even with that specific grant, several safeguards apply:
- No attorney-in-fact may, with the intent of causing death, authorize the withdrawal of nutrition or hydration you can take in through natural means. This prohibition is absolute regardless of what the document says.5Missouri Revisor of Statutes. Missouri Code 404.820 – Withdrawing or Withholding Treatment, Specific Authority Required, Restrictions
- Before withdrawing artificial nutrition or hydration, the physician must try to explain to you what is about to happen and give you the chance to refuse. If that’s impossible because you’re comatose or otherwise unable to understand, the physician must place a written certification of that fact in your medical file.
- Nothing in the statute requires continuing artificial nutrition and hydration if, in the attending physician’s medical judgment, you cannot physically tolerate it.
- Your agent must always consider appropriate comfort measures in line with current medical standards.
How to Revoke It
You do not need a written document to revoke a Missouri healthcare power of attorney. The statute says you can revoke it “at any time and in any manner by which the patient is able to communicate the intent to revoke.” A verbal statement works. A written letter works. A gesture works, so long as it clearly communicates your intent. Revocation takes effect the moment you communicate it to either your attorney-in-fact or your attending physician or healthcare provider.6Missouri Revisor of Statutes. Missouri Code 404.850 – Revocation of Power of Attorney for Health Care
Once a physician or provider learns of the revocation, they must add it to your medical records. Signing a new healthcare power of attorney automatically revokes any prior one unless the new document says otherwise.6Missouri Revisor of Statutes. Missouri Code 404.850 – Revocation of Power of Attorney for Health Care Oral revocation is legally valid, but putting it in writing and notifying everyone involved is the practical move. A hospital that never hears about your verbal revocation at home may still act on the old document.
Provider Conscience Refusals
Missouri does not force doctors or facilities to carry out every decision your agent makes. Under section 404.830, no physician, nurse, or other healthcare provider, and no hospital, nursing facility, or residential care facility, is required to honor a decision of your attorney-in-fact that conflicts with the provider’s professional judgment or conscience. When a provider declines, the statute allows a transfer to a willing provider or facility. This matters most in end-of-life situations, where your agent may need to arrange a transfer to have your instructions carried out.
Good-Faith Protection for Providers
Under section 404.855, a third party who follows your attorney-in-fact’s instructions in good faith is shielded from liability to you or your successors. This lets hospitals and doctors act on your agent’s word without conducting their own legal investigation into the document. The practical takeaway for you: putting clear, specific preferences into the document creates a record that both empowers a faithful agent and constrains one who strays.
What This Document Does Not Cover
A healthcare power of attorney does not give your agent authority over your Social Security or SSI benefits. The Social Security Administration is explicit that having power of attorney is not the same as being a payee, and the Treasury Department does not recognize a power of attorney for negotiating federal payments. If your agent will also need to manage your government benefits during incapacity, they have to apply separately to be your representative payee.7Social Security Administration. Frequently Asked Questions for Representative Payees It’s a different application and a different legal role.
Making Sure It Actually Works
A document that meets every statutory requirement can still fail if your agent can’t find it during an emergency or doesn’t know what you’d want in a gray-area situation. Give copies to your agent, your primary care physician, and any hospital where you regularly receive treatment. Check whether your healthcare system’s patient portal lets you upload advance directives. Keeping the original in a fireproof safe at home is fine, so long as someone other than you knows where it is and can get to it.
If you have a living will or other advance directive along with your healthcare power of attorney, read both together and make sure they don’t contradict each other. Your agent is expected to follow your known wishes, and conflicting documents produce exactly the kind of ambiguity that leads to family disputes. Revisit both every few years, or whenever your health, family, or preferences change.