When Should Home Health Start After Knee Replacement?

In the United States, if your discharge plan includes home health after knee replacement, expect the agency’s start-of-care visit within about 48 hours of the referral or your return home. A physician or other allowed practitioner can order a different start date, so the date documented in your discharge plan controls.

Rehabilitation begins earlier than home health in many cases. A physical therapy clinical practice guideline recommends starting physical therapist management within 24 hours of total knee replacement and before hospital discharge. After discharge, the appropriate rehabilitation setting depends on safety, mobility, the home environment and personal circumstances—not one schedule or setting for every patient (physical therapy clinical practice guideline).

Choose the situation shown on your discharge paperwork to see your next step.

The 48-Hour Window Applies to the Start of Home Health

Federal rules for Medicare-certified home health agencies require an initial assessment visit within 48 hours of the referral, within 48 hours of the patient’s return home, or on the start-of-care date ordered by the clinician. A registered nurse usually performs this assessment. When rehabilitation is the only ordered service, an appropriate physical, occupational or speech therapist may perform it instead (42 CFR §484.55).

The rule concerns the agency’s initial assessment, not necessarily the first complete physical therapy session. The assessment establishes care and identifies immediate needs. If a nurse makes the start-of-care visit, that does not by itself mean home physical therapy has started.

This distinction matters when reading a discharge plan. “Home health starts Friday” may identify the agency’s initial visit, while the physical therapist is scheduled separately. Before leaving the hospital or surgical center, ask for both dates if nursing and therapy were ordered.

The 48-hour expectation also should not be interpreted as permission to remain inactive until someone arrives. Follow the walking, positioning, exercise and assistive-device instructions supplied by the surgical team. Those instructions are the bridge between discharge and the first home visit; they should not be replaced with a harder self-designed program.

Home Physical Therapy May Have a Separate Start Date

A home health order can include skilled nursing, physical therapy, occupational therapy or a combination. The services ordered determine who comes to the home and what occurs at each visit.

If rehabilitation is the only ordered service, a qualified therapist may complete the initial assessment. If nursing and physical therapy are both involved, a nurse may open the case before the therapist’s first appointment. The patient may therefore have received a timely home health assessment while still waiting for the first therapy session.

Ask the discharge planner to identify the service attached to each appointment. The useful questions are specific:

• Which home health agency accepted the referral?
• Does the order include nursing, physical therapy, occupational therapy or a combination?
• What is the ordered start-of-care date?
• Who will conduct the initial assessment?
• What is the date of the first physical therapy visit?
• Who should be called if either visit is not scheduled?

Do not assume that an agency name on the paperwork means the referral was accepted. Confirm acceptance and obtain the agency’s phone number before discharge whenever possible.

An Unexplained Therapy Delay Deserves Prompt Follow-Up

A 2026 observational study examined 18,998 Medicare beneficiaries age 65 or older who received home health after hip or knee replacement. In that population, 17% did not begin home physical or occupational therapy within two days. A delayed start was associated with less mobility improvement during home health care (University of Utah Health).

The study does not establish that the delay caused poorer recovery. It also combined people recovering from hip and knee replacements, so its findings are not a knee-replacement-only estimate. The results nevertheless support checking on an unexplained delay rather than allowing the schedule to drift without clarification.

The same study found larger access gaps among rural patients and people eligible for both Medicare and Medicaid. That finding applies to the study population and does not establish that every rural patient will experience a delay. It does make early confirmation particularly useful when an agency must cover a distant address or coordinate multiple benefits.

A different start date is not automatically a delay. If the ordering clinician documented a later date, that date controls under the federal start-of-care rule. The problem is a missed or unexplained date: no agency contact, no appointment, or an agency that says it never received the referral.

Some Patients Go Directly to Outpatient Rehabilitation

Formal home health is not required after every knee replacement. Some patients go directly to outpatient physical therapy, while others follow a clinician-directed program at home. The appropriate route depends on the discharge plan rather than a universal requirement for home visits.

A 2023 systematic review found no significant differences in several clinical outcomes between home-based and outpatient rehabilitation after total knee replacement. The included programs and schedules varied, however, and the authors called for stronger long-term trials (systematic review and meta-analysis).

That finding does not mean the two settings are interchangeable for every person. The clinical practice guideline calls for the post-discharge setting to be selected according to safety, mobility, the home environment and personal circumstances. A person who cannot safely reach an outpatient clinic has a different discharge problem from someone who can travel and transfer without unacceptable risk.

The American Academy of Orthopaedic Surgeons says that a patient going home should be able to use the prescribed walking aid, perform the prescribed home exercises and understand the relevant precautions. If those goals cannot be met safely or adequate help is unavailable, discharge directly home may not be appropriate (AAOS recovery guidance).

If your plan says outpatient therapy rather than home health, the 48-hour home health rule does not create a home visit. Use the outpatient appointment and interim instructions provided by the surgical team. Do not change from home therapy to outpatient therapy—or the reverse—without confirming that the alternative is safe and that the required order or referral is in place.

Medicare Coverage Requires More Than a Knee Replacement

Under Original Medicare, covered home health generally requires an order from a qualified provider, a need for part-time or intermittent skilled services and homebound status. Medicare may cover eligible physical therapy, occupational therapy, skilled nursing and certain other services (Medicare home health coverage).

Medicare does not cover round-the-clock home care, meal delivery or personal care when personal care is the only service needed. A patient may need help at home after surgery without meeting the requirements for Medicare-covered home health.

Medicare Advantage networks and procedures may differ. An agency may need to participate in the plan’s network or complete the plan’s authorization process. The discharge planner or insurer can explain which agency received the referral and whether authorization remains pending.

These coverage requirements should not be confused with the clinical decision about where rehabilitation should occur. Coverage, homebound status and network participation affect whether a particular home service is paid for. Safety and mobility help determine whether going home and receiving care there is suitable in the first place.

Confirm Both the Agency and Therapy Schedule Before Discharge

The discharge paperwork should identify the route after hospitalization: home health, outpatient therapy, another rehabilitation setting or a clinician-directed home program. If home health appears in the plan, obtain the accepted agency’s name and contact number.

Also identify the event that starts the 48-hour timeline. Depending on the circumstances described in the federal rule, that may be the referral or the return home. A clinician can instead order a specific start-of-care date. You do not need to resolve ambiguous wording yourself; ask the discharge planner to write down the date the agency is expected to visit.

Before leaving, confirm:

• The services included in the order.
• The agency that accepted the referral.
• The ordered start-of-care date, if one was specified.
• The expected initial assessment date if no separate date was ordered.
• The first physical therapy date when it differs from start of care.
• The walking aid, exercises and precautions to use while waiting.
• The planned transition to outpatient therapy, if one is expected.
• The hospital or surgical-team contact for a failed referral.

Keep the paperwork accessible rather than relying on a verbal description. When calling about a delay, it helps to distinguish “no one has opened the home health case” from “the nurse came, but physical therapy is not scheduled.” Those are different coordination problems.

Call the Agency First When a Visit Is Due

If the start-of-care visit is due but not scheduled, call the home health agency using the number on the discharge paperwork. Ask whether it accepted the referral, which services it received orders for and what date its records show for the initial visit.

If the agency has no referral or cannot meet the ordered date, contact the hospital discharge planner or surgeon’s office the same day. Ask that office to verify that the order, supporting documents and any required insurance authorization reached an agency serving your address.

If the agency completed an assessment but therapy has not begun, ask whether physical therapy was included in the order and whether a therapist has been assigned. Then contact the surgical team if the answer conflicts with the discharge plan or no therapy date is available.

Continue the walking, positioning and exercise instructions you were given while the schedule is corrected. Keep using the prescribed walker or cane. Do not create a more demanding program based on what someone else did after surgery.

If home service cannot be arranged, ask the surgical team whether outpatient therapy is a safe alternative. Switching settings may require a different order and a fresh assessment of transportation, transfers and mobility.

Possible Complications Should Not Wait for Home Health

A scheduling problem is different from a possible surgical complication. Do not wait for the home health agency to evaluate symptoms that the surgical team told you to report.

Contact the surgical team immediately for increasing wound redness or drainage, shaking chills, persistent fever above 100°F (37.8°C), increasing pain, new or severe swelling, or calf pain, redness or tenderness. Call emergency services for sudden chest pain or shortness of breath, which can be signs of a clot in the lungs (AAOS warning signs).

Use the urgent instructions from your own surgical team if they differ or include additional symptoms. A home health appointment later that day is not a substitute for the level of response the surgical team directed.

For the later recovery picture, see progress and warning signs three months after total knee replacement.