The short version

It happens twice — once leaving the hospital, once leaving the rehab facility. Different rules govern each.
You have a federal right to see quality data on the facilities and agencies you are choosing between. Most families are handed a list with no numbers on it.
The plan must be built around the patient's goals and preferences, with the family as active partners — not presented as finished.
"Safe discharge" is a judgment about a home, not a body. Stairs, bathrooms, and who is there at 2am decide more discharges than diagnoses do.

Ask most families when discharge planning started and they will say the week it ended. Ask a case manager and they will say day one. Both are describing the same process, and the gap between those two answers is where avoidable readmissions live.

When does discharge planning actually start?

On admission. The first-week assessments are partly a discharge planning exercise — the therapist asking about stairs and bathrooms is not making conversation, they are scoping what has to be true for someone to leave.

The reason families experience it as sudden is that the process runs largely without them until a date appears. Nothing requires it to work that way. Federal rules on both sides of the transition require the plan to be built around the patient's goals and preferences, with the patient and caregivers as active partners rather than recipients.

How do you choose which facility?

With data you have a right to see, and almost nobody asks for.

When a hospital discharges someone to post-acute care, it must help them choose a provider — and under the 2019 discharge planning rule it must do that by using and sharing data on quality measures and resource use for the facilities and agencies in question.

CMS names the kinds of measures explicitly: rates of pressure ulcers, the proportion of falls that lead to injury, and readmissions back to the hospital. The data has to be relevant to the patient's goals and treatment preferences, not generic.

What this means at the bedside

A printed list of five facilities with addresses is not what the rule describes. If you are handed one, the question is: can you show me the quality measures for these, and how they compare?

Two practical caveats. CMS has clarified that a facility with no available bed may be left off the list, so the list you get is not necessarily every facility in the area. And hospitals may have network relationships with some providers — asking whether any on the list are partners is a fair and useful question.

You can also look the numbers up yourself on Medicare's Care Compare, which publishes staffing, inspection results, and quality measures by facility.

What does "safe discharge" actually mean?

It is a judgment about a whole situation, not a level of function. The same patient can be safe to go home from one address and not another.

What actually gets weighed:

The building. Stairs to the front door, stairs to the bathroom, width of doorways, whether the bedroom is on the ground floor.
The help. Who is there, how often, and whether they can physically assist. A devoted spouse who cannot lift is not the same as a devoted spouse who can.
The nights. Most falls and most crises happen when nobody is awake. A plan that works from nine to five is not a plan.
The equipment. Whether the walker, commode, or hospital bed will actually be delivered before arrival rather than three days after.
The follow-up. Whether appointments exist, whether transport to them exists, and who is managing medications in week one.

This is why occupational therapy often has the most grounded view of whether home is realistic. Assessing exactly this is their job.

Where discharges break

The single most common cause of a discharge that unravels is not a medical misjudgement. It is that nobody asked a specific enough question about the home, and the answer given was optimistic.

That is a practice observation, not a research finding. Families understandably want to say yes — the alternative sounds like abandoning someone. But there is a bathroom on the main floor and there is a half-bath on the main floor and the shower is upstairs are different answers, and only one of them is survivable in week one.

What should the discharge summary contain?

Whatever the next person needs in order to take over safely. In practice that means the diagnoses and what happened, the current medication list with what changed and why, functional status at discharge, follow-up appointments, equipment ordered, warning signs to watch for, and who to call.

Medication changes deserve particular attention. A stay of any length usually alters the list, and the version that goes home is often not the version that came in. Sitting with someone and comparing the discharge list against the pre-hospital list is fifteen minutes that prevents a genuinely common category of problem.

Hospitals are also required to transmit the necessary medical information to the next provider at the time of discharge, along with post-discharge goals and treatment preferences. If your family member arrives somewhere and nobody appears to know their history, that is worth raising rather than accepting.

When the timing seems wrong

Two different situations, with two different answers.

If Medicare coverage is ending and you disagree, that is an appeal, it is free, and the deadline is short — the process is covered in full here.

If the clinical judgment seems wrong but coverage is not the issue, ask for a care plan meeting and be specific about what you think has been missed. In my experience the objection that changes a plan is almost never "it feels too soon" — it is "she cannot get to the toilet at night without help and there is nobody there after ten."

Before discharge day

Confirm the date, and confirm what is supposed to be delivered before it.
Get the medication list and compare it to what she took before the hospital.
Check that follow-up appointments exist and that someone can physically get her to them.
Ask what warning signs should trigger a call, and who to call — including after hours.
Ask whether home health has been arranged, and when the first visit is.
Walk the house before she is in it. Move the rugs, clear the path, put a light where the route to the bathroom is.

The last one takes an afternoon and prevents more problems than most of the rest combined.

This article is general education about how discharge planning and its federal requirements work. It is not medical advice, does not create a patient–provider relationship, and cannot account for an individual situation. Requirements differ between hospitals, skilled nursing facilities, and home health agencies, and Medicare Advantage rules differ from traditional Medicare. For a specific person, speak with their care team and case manager. See the editorial policy for how this content is written and reviewed.

Sources

Centers for Medicare & Medicaid Services. CMS' Discharge Planning Rule Supports Interoperability and Patient Preferences. The requirement to assist patients in selecting a post-acute provider using quality and resource-use data.
Electronic Code of Federal Regulations. 42 CFR § 482.43 — Discharge planning. Patient goals and preferences, active partnership, and transmission of medical information at the time of discharge.
Electronic Code of Federal Regulations. 42 CFR § 483.21 — Comprehensive person-centered care planning. Discharge planning requirements for skilled nursing facilities.
Medicare.gov. Care Compare. Published quality measures, staffing, and inspection results by facility.