Medical Power of Attorney Massachusetts: It's Called a Health Care Proxy

If you are searching for a "medical power of attorney" in Massachusetts, you are looking for the right thing under the wrong name. Massachusetts does not use that term. The document you need is a Health Care Proxy, governed by Massachusetts General Laws Chapter 201D.

The name difference is not just terminology. Massachusetts structures its medical decision-making authority differently from most states, and understanding the distinction matters when your family is making life-or-death decisions at 3 a.m.

Why Massachusetts Uses "Health Care Proxy" Instead

Most states use "medical power of attorney," "healthcare power of attorney," or "advance directive for health care" as catch-all terms for the document that appoints someone to make medical decisions on your behalf. Massachusetts specifically chose "Health Care Proxy" because the law creates a narrower, more precisely defined relationship than a general power of attorney.

Key distinctions:

A Health Care Proxy activates only upon incapacity. Your attending physician must determine in writing that you lack the capacity to make healthcare decisions. Until that happens, the proxy is dormant and your agent has no authority. In contrast, some states allow medical powers of attorney to be effective immediately upon signing.

A Health Care Proxy covers medical decisions only. It has no authority over financial matters, property transactions, or legal affairs. For those, you need a separate Durable Power of Attorney. Many states allow a single "power of attorney" document to cover both — Massachusetts does not.

A Health Care Proxy has specific statutory witness requirements. Two adult witnesses must be present when you sign. Your agent and alternate agent cannot serve as witnesses. Healthcare facility operators cannot serve as your agent unless they are related to you. These strict rules are built into the statute and are not negotiable.

What Your Health Care Agent Can Do

Once the proxy activates (after a physician certifies your incapacity), your Health Care Agent has broad medical authority:

• Consent to or refuse any medical treatment, including surgery
• Authorize or withdraw life-sustaining treatment
• Choose healthcare providers and care facilities
• Access your medical records
• Authorize transfers between hospitals or care levels
• Consent to psychiatric medications or electroconvulsive therapy (if your proxy specifically addresses psychiatric care)
• Make decisions about organ donation

Your agent is bound by the "substituted judgment" standard: they must make decisions as you would have made them, based on your known wishes, values, and beliefs. If your wishes are unknown, the agent must act in your best interest.

What Your Health Care Agent Cannot Do

• Make financial decisions (requires a separate Durable Power of Attorney)
• Override your decisions while you still have capacity
• Act contrary to your documented treatment preferences without justification
• Commit you to a psychiatric facility against the instructions in your Personal Directive (if you included psychiatric preferences)
• Consent to medical treatment that violates generally accepted medical practice

Who Can Serve as Your Agent

Any competent adult can serve as your Health Care Agent, with one important restriction: the operator, administrator, or employee of a healthcare facility where you are a patient or resident cannot serve as your agent, unless they are related to you by blood, marriage, or adoption.

Choosing the right agent is arguably more important in Massachusetts than in any other state, because the Commonwealth has no default surrogate consent law. If your proxy is invalid or your agent is unavailable, doctors cannot take direction from your spouse, children, or parents. The hospital must petition the Probate and Family Court for a medical guardian — a process that costs thousands and delays treatment by weeks.

Practical guidance for choosing an agent:

• Pick someone who can handle high-pressure conversations with medical staff
• Choose someone geographically accessible — they may need to be at the hospital within hours
• Name an alternate agent in case your primary agent is unavailable
• Make sure your agent knows your values and treatment preferences before a crisis occurs

If You Already Have a Medical Power of Attorney From Another State

If you moved to Massachusetts with a medical power of attorney executed in another state, it may still be honored under interstate comity principles. However, Massachusetts hospitals and physicians are most familiar with their own statutory form. For maximum reliability, execute a Massachusetts Health Care Proxy after you move. You can have both documents in place — the new proxy will supersede the old one for decisions made by Massachusetts providers.

The Complete Massachusetts Medical Authority Package

A health care proxy alone is not a complete plan. In Massachusetts, you need:

1. Health Care Proxy — appoints your medical decision-maker
2. Personal Directive — documents your specific treatment preferences (Massachusetts does not have a statutory living will, so the Personal Directive serves this purpose)
3. Durable Power of Attorney — appoints your financial decision-maker
4. Declaration of Homestead — protects up to $1,000,000 in home equity from creditors

The Massachusetts Advance Directive & Living Will Kit provides all the medical planning documents with execution checklists, witness eligibility verification, and coordination with financial protection strategies.

See more Massachusetts guides →