Texas Advance Directives Act: What Chapter 166 Actually Says

The Texas Advance Directives Act is Chapter 166 of the Health and Safety Code — the single statute that governs every healthcare directive in the state. It authorizes four separate forms, sets execution rules, establishes provider immunity, and defines the dispute resolution process when hospitals disagree with patient wishes.

Most guides mention it in passing. Here's what the law actually contains and why each section matters for your planning.

The Four Subchapters

Chapter 166 is organized into subchapters, each governing a distinct document:

Subchapter B: Directive to Physicians and Family or Surrogates — The Texas living will. Allows you to declare preferences about life-sustaining treatment when facing a terminal or irreversible condition. Stays in effect indefinitely unless revoked.

Subchapter C: Out-of-Hospital Do-Not-Resuscitate Order — Directs EMS and first responders to withhold CPR and resuscitation outside hospital settings. Requires signatures from the patient, physician, and witnesses or notary — plus a second acknowledgment signature block.

Subchapter D: Medical Power of Attorney — Designates a healthcare agent to make all medical decisions during incapacity. Broader than the living will: covers every healthcare scenario, not just terminal conditions.

Subchapter E: Declaration for Mental Health Treatment — Covers psychoactive medications, convulsive therapy, and emergency mental health care. Unique among the four because it expires after three years.

Key Provisions That Affect You

Execution Requirements (§ 166.003)

All advance directives require either two qualified witnesses or a notary public. The law imposes strict conflict-of-interest rules: at least one witness must be fully disinterested — not your designated agent, a blood relative, an estate heir, a creditor, your attending physician, or an employee providing your direct care.

No attorney is required. The statutory forms are designed for self-execution.

Revocation Rules (§ 166.004)

You can revoke any directive at any time, by any method — verbal notice, written revocation, physical destruction, or executing a new document. Critically, Texas allows revocation regardless of your current mental capacity. Even if you're cognitively impaired, you can revoke a directive.

If your MPOA agent is your spouse and you divorce, the agent designation is automatically revoked unless the document says otherwise.

Provider Immunity (§ 166.045)

Physicians and facilities that withhold or withdraw life-sustaining treatment in good-faith compliance with a valid advance directive receive broad civil and criminal immunity. This protection is what gives hospitals confidence to honor your documented wishes without fear of liability.

Out-of-State Recognition (§ 166.005)

An advance directive executed in another state is recognized in Texas to the extent it complies with the originating state's laws. However, it cannot authorize anything prohibited under Texas law. In practice, out-of-state documents frequently cause delays at Texas hospitals. Executing Texas-specific forms eliminates this friction.

Default Surrogate Hierarchy (§ 166.039)

When no advance directive or MPOA exists and no guardian has been appointed, the law establishes a priority order: spouse, then adult children (with majority consensus), then parents, then nearest relative. If no family is available, a second physician must concur with treatment decisions.

The HB 3162 Reforms (2023)

House Bill 3162, effective September 1, 2023, made the most significant changes to Chapter 166 in years:

• Extended the ethics committee notice period from 48 hours to seven calendar days
• Expanded the treatment-continuation window from 10 to 25 calendar days after a committee upholds a physician's refusal
• Prohibited the committee from making quality-of-life judgments or considering pre-existing disability
• Required the physician to perform any procedures necessary to facilitate patient transfer during the 25-day window

These changes directly addressed concerns that the prior law gave hospitals too much power to override patient wishes on a compressed timeline.

Why the Legal Framework Matters

Understanding Chapter 166 isn't just academic. It tells you:

• Which forms you need (all four serve different purposes — they're not interchangeable)
• What makes them valid (witness rules, formatting requirements)
• What happens if your wishes are challenged (the ethics committee process)
• What happens if you have no documents at all (the default hierarchy)

The Texas Advance Directive & Living Will Kit maps each section of Chapter 166 to the specific form it authorizes, with execution checklists that ensure your documents meet every statutory requirement.

See more Texas guides →