ACP most commonly stands for advance care planning, the process of thinking ahead about your medical care and putting your wishes in writing in case you ever can’t speak for yourself. It involves conversations with family, legal documents, and sometimes formal medical orders. The abbreviation also has other meanings in healthcare, including the American College of Physicians and advanced clinical practitioner, which are covered briefly below.
Advance Care Planning: The Basics
Advance care planning is the process of discussing and preparing for future medical decisions before a serious illness or emergency takes away your ability to communicate. The core of the process isn’t paperwork. It’s conversation. Talking with the people closest to you about what kind of care you’d want, and what you wouldn’t want, is the single most important step.
People who have these conversations and put a plan in place are more likely to receive care that matches their preferences. The process also benefits families: research consistently shows it reduces guilt, depression, anxiety, and complicated grief among the people left making decisions on a loved one’s behalf. In studies tracking surrogate decision-makers, 100% of mental health outcomes improved when advance care planning had taken place beforehand.
Documents Involved in an ACP
Once you’ve had those conversations, the next step is making your wishes legally enforceable. Advance care planning typically produces two key documents, sometimes more.
- Advance directive (living will): A legal document that spells out what medical treatments you do or don’t want if you’re unable to communicate. It only takes effect when you can no longer make decisions yourself.
- Healthcare power of attorney (healthcare proxy): This names a specific person you trust to make medical decisions on your behalf. Choosing this person, and making sure they understand your values, is just as important as the document itself.
- POLST or MOLST form: These are actual medical orders, signed by a physician, that emergency responders and hospital staff can act on immediately. Unlike advance directives, which require interpretation, a POLST form gives direct clinical instructions about things like resuscitation and life-sustaining treatment.
How POLST Differs From an Advance Directive
This distinction trips up even physicians. In one national study, 78% of doctors incorrectly treated an advance directive as an automatic do-not-resuscitate order, regardless of what the document actually said. Advance directives are broader, values-based documents. They express your general preferences and appoint a decision-maker. A POLST form is a focused, actionable set of medical orders designed for people who are already seriously ill. It can even predict where and roughly when a patient may die, because it directly shapes what treatments are given in emergencies.
Ideally, you have both. The advance directive captures your bigger picture wishes and names your proxy. The POLST translates those wishes into specific orders that medical teams follow without delay.
Why Many People Don’t Have One
Despite the clear benefits, advance care planning remains uncommon. The barriers are both practical and emotional. Many people simply don’t want to think about serious illness or death. Physicians often hesitate to start the conversation, preferring to focus on active treatment rather than future scenarios. Time pressure during appointments makes it hard to squeeze in a 30-minute discussion about end-of-life preferences.
On the clinical side, coordination gaps between hospitals, outpatient clinics, nursing homes, and home care services mean that even when a plan exists, it may not travel with the patient. Staffing shortages compound the problem, particularly in nursing homes where palliative care specialists are scarce. The COVID-19 pandemic made things worse by restricting family visits (advance care planning legally requires witnesses in many states) and overwhelming staff with competing demands.
What Advance Care Planning Actually Accomplishes
The evidence on ACP outcomes is nuanced. It does some things very well and others less reliably. Communication satisfaction is one clear win: across studies, 100% of outcomes measuring patient, family, and clinician satisfaction with communication were positive when advance care planning had occurred. Agreement between patients and their surrogates about treatment preferences improved 88% of the time.
Family surrogates also reported being 75% more satisfied with the patient’s care. And mental health outcomes for surrogates, including reduced depression, PTSD, and caregiver burden, improved across the board. Where ACP shows less consistent impact is in whether the care actually delivered matches the patient’s stated goals. Only about 10% of studies measuring goal-concordant care found a clear positive effect. This likely reflects the interpretation problems noted above: documents exist, but clinicians don’t always read or follow them correctly.
The takeaway is that advance care planning reliably improves communication and reduces family distress, even if the healthcare system doesn’t yet perfectly translate those wishes into matching treatment.
Medicare Coverage for ACP Conversations
Since 2016, Medicare has covered advance care planning as a billable service. Your doctor or another qualified healthcare professional can bill for a face-to-face conversation lasting at least 30 minutes that covers topics like advance directives and your treatment preferences. Additional 30-minute sessions are also covered. This means you shouldn’t face out-of-pocket costs for having this conversation during a regular office visit, and your doctor has a financial incentive to make time for it.
Other Meanings of ACP
If you searched “what is an ACP” looking for something other than advance care planning, here are two other common uses of the abbreviation in healthcare.
American College of Physicians
The ACP is also the American College of Physicians, a professional organization for internal medicine doctors. With over 31,000 members, its mission is to improve healthcare quality by promoting excellence in medical practice. If you see “ACP” cited in clinical guidelines or policy recommendations, this is usually the organization behind them.
Advanced Clinical Practitioner
In nursing and allied health, ACP can refer to an advanced clinical practitioner, sometimes called an advanced practice registered nurse (APRN). These are registered nurses who hold at least a master’s degree and have completed specialized graduate training. They can evaluate patients, diagnose conditions, order and interpret tests, and prescribe medications, including controlled substances. Many programs are shifting to require doctoral-level education. Advanced practitioners play a particularly important role in rural and underserved areas where physician access is limited.