Medicare has required therapy to begin within 36 hours of admission to an inpatient rehabilitation facility for years. That is worth stating first, because the requirement is frequently reported as though it were new.
What the Centers for Medicare and Medicaid Services has actually proposed is narrower and, for patients, arguably more consequential. Under the existing regulation, it has been ambiguous whether one therapy discipline or all of them must start inside the window. CMS has proposed revising the rule so that all therapy treatments or evaluations must begin no later than 36 hours after midnight on the day of admission.
If finalized, the change would apply to discharges on or after October 1, 2026. As of this writing, MedicalDaily could not confirm that the final rule has been issued. CMS published the corresponding inpatient psychiatric facility final rule on July 29, and the rehabilitation rule has historically followed within days, so a decision is likely imminent.
The Ambiguity CMS Is Trying to Close
Inpatient rehabilitation facilities are a distinct level of care, more intensive than a skilled nursing facility and used after stroke, major joint replacement, spinal cord and brain injury, amputation, and serious trauma.
For a stay to qualify as reasonable and necessary under Medicare, a patient generally must need active intervention from multiple therapy disciplines, at least one of which is physical or occupational therapy, and must be able to participate in an intensive program of at least three hours of therapy a day, five days a week. The 36-hour clock runs from midnight on the admission day.
The interpretive dispute has been practical. A patient admitted needing physical therapy, occupational therapy, and speech-language pathology might have had physical therapy start promptly while speech therapy waited days for an available evaluator. Under one reading of the existing rule, that satisfied the requirement. Under the proposal, it would not.
The proposed rule package includes related changes: documenting a patient's current functional status on the preadmission screening, and requirements for when the initial interdisciplinary team meeting occurs. CMS also included a request for information on broader payment reform for this setting.
Payment Accuracy Sits Behind the Proposal
The compliance backdrop explains why CMS is tightening a definition rather than writing a new standard.
The agency has reported an improper payment rate of 29.4 percent for inpatient rehabilitation hospitals in 2024 data, with a projected improper payment amount of $1.4 billion, and 22.1 percent for rehabilitation units. Medical necessity accounted for 86 percent of improper payments in rehabilitation units, with insufficient documentation making up most of the rest.
An ambiguous requirement is difficult to audit. A rule stating that all therapies must begin inside a defined window produces a verifiable record, which is what a claims reviewer can check. The broader proposed rule also carries a 2.8 percent estimated payment increase for these facilities, so the tightening arrives alongside more money rather than instead of it.
The Evidence on Timing Is Not a Straight Line
The intuitive case for starting rehabilitation quickly is real. Prolonged immobility after a major medical event produces muscle wasting, deconditioning, pressure injuries, and complications that themselves lengthen recovery.
But the largest randomized trial in stroke rehabilitation found that faster and more intensive is not automatically better. AVERT, conducted across 56 acute stroke units in five countries, tested very early mobilization beginning within 24 hours of stroke against usual care. The very early, higher-dose protocol was associated with reduced odds of a favorable outcome at three months. Subgroup findings suggested patients with severe stroke or intracerebral hemorrhage may have been most susceptible.
A prespecified dose-response analysis published in Neurology refined that. It found that shorter, more frequent out-of-bed sessions were associated with better odds of a good outcome, while a greater total number of minutes per day reduced them. The authors concluded that the assumption that more practice is always better needs reconsidering in the first days after stroke.
Two caveats keep this from being a refutation of the Medicare rule. AVERT tested mobilization within 24 hours of stroke onset in an acute hospital, while the 36-hour rule applies at admission to a rehabilitation facility, typically days later when a patient is medically stable. And commentators on AVERT warned explicitly that the findings should not be used to justify prolonged immobilization, which carries its own harms.
The honest summary is that timing, frequency, and intensity interact in ways the research has not fully resolved, and that a single administrative threshold is a blunt instrument for a clinical question.
What This Could Mean at the Bedside
For patients and families, the practical effect of a tightened rule is likely to cut in two directions.
The favorable reading is that it forces facilities to staff for all disciplines a patient actually needs, rather than starting the easiest one and deferring the rest. A patient with post-stroke swallowing difficulty who waits four days for a speech-language pathology evaluation is receiving worse care than the admission plan promised.
The less favorable reading is capacity. A facility that cannot recruit a speech-language pathologist may respond to a stricter deadline by admitting fewer patients who need that discipline, or by conducting a cursory evaluation to satisfy the clock. Neither has been demonstrated, and both are the kind of unintended consequence commenters typically raise.
Families should also understand that this is not the rule that determines whether Medicare covers the stay. Coverage turns on the broader medical necessity criteria, including whether the patient can tolerate three hours of therapy daily. Denials in this setting most often rest on medical necessity and documentation rather than on timing.
Questions worth asking on admission day include which therapy disciplines are in the plan, when each will begin, and who to contact if one has not started. Anyone told a discipline is unavailable can ask for that to be documented and can raise it with the facility's case manager. Patients who receive a Medicare denial have appeal rights, and the free State Health Insurance Assistance Program provides counseling in every state.
What happens next is a specific document. When CMS publishes the FY 2027 final rule, it will state whether the all-therapies requirement was adopted as proposed, modified, or dropped in response to comments. MedicalDaily will report the outcome.
Frequently Asked Questions
Is the 36-hour requirement new? No. Medicare has required therapy to begin within 36 hours of midnight on the admission day for years. What is proposed is a change to how many therapies must start in that window.
What exactly is CMS proposing? That all therapy treatments or evaluations, not just one, begin no later than 36 hours after midnight on the day of admission, resolving a long-standing ambiguity.
When would it take effect? For discharges on or after October 1, 2026, if finalized. MedicalDaily could not confirm publication of the final rule as of July 31, 2026.
What is an inpatient rehabilitation facility? A hospital-level rehabilitation setting used after stroke, major joint replacement, brain or spinal cord injury, amputation, and serious trauma, requiring roughly three hours of therapy daily.
Does starting rehabilitation sooner always improve recovery? Not necessarily. The largest randomized stroke rehabilitation trial found very early, high-dose mobilization within 24 hours was associated with worse three-month outcomes than usual care.
Does that mean the Medicare rule is wrong? No. That trial tested mobilization in an acute hospital within a day of stroke, while this rule applies at rehabilitation admission days later, when patients are medically stable.
What should families ask on admission day? Which therapy disciplines are in the plan, when each starts, and who to contact if one has not begun. Ask for any delay to be documented.
