A detailed review of the 2026 JAMA Internal Medicine study on the Medicare 3 day rule reinstatement. Learn how the policy affected hospital stays, SNF utilization, Medicare spending, and patient outcomes.
In May 2023, Medicare reinstated its long standing 3 day hospital stay rule for coverage of skilled nursing facility care. The policy shift marked the end of a temporary waiver that had been in place during the COVID 19 public health emergency. A major new study published in JAMA Internal Medicine in February 2026 examines what happened next.
The findings are striking. Reinstating the 3 day rule increased hospital length of stay but did not reduce skilled nursing facility use, Medicare spending, or short term adverse outcomes. For policymakers, hospitals, and beneficiaries, these results raise important questions about whether the rule still serves its intended purpose.
This article breaks down the study, explains the policy background, and explores what the results mean for Medicare’s future.
The Medicare 3 day rule requires beneficiaries to have a hospital inpatient stay of at least three consecutive days before Medicare will cover care in a skilled nursing facility, often referred to as an SNF.
The rule was created decades ago as a screening mechanism. The goal was to ensure that Medicare would only pay for SNF care for patients who truly needed short term rehabilitation following a significant hospitalization.
Supporters argue that the rule discourages unnecessary SNF use. Critics counter that it can:
During the COVID 19 public health emergency, federal policymakers temporarily waived the rule to improve flexibility. On May 12, 2023, the rule was reinstated.
That reinstatement created a natural experiment.
The study, titled Changes in Inpatient and Skilled Nursing Facility Care After the Medicare 3 Day Rule Reinstatement, was led by Zihan Chen, MPP, and colleagues. It was published online on February 9, 2026 in JAMA Internal Medicine.
Researchers analyzed more than 600,000 traditional Medicare hospitalizations between January and November 2023. Specifically:
The team used a regression discontinuity design. This quasi experimental method compares outcomes just before and just after a clearly defined policy cutoff date. Because the rule changed abruptly, any sharp change in outcomes around that date can reasonably be attributed to the policy shift rather than other trends.
The researchers examined:
This approach allowed them to assess both utilization and patient outcomes.
The clearest effect of reinstating the 3 day rule was an increase in hospital stays that lasted at least three days.
Before reinstatement:
After reinstatement:
The adjusted increase was 1.13 percentage points. That translates to a relative increase of about 1.9 percent.
The impact was much larger for patients who ultimately went to skilled nursing facilities.
Before reinstatement:
After reinstatement:
The adjusted increase was 5.57 percentage points, or a 6.4 percent relative change.
This pattern strongly suggests that hospitals extended stays just enough to meet the eligibility requirement for SNF coverage.
If the 3 day rule was designed to reduce unnecessary SNF utilization, the study found little evidence that it worked.
The probability of discharge to an SNF did not significantly change after the rule was reinstated.
In other words:
This finding challenges the original rationale behind the rule.
The study also found no significant changes in:
Despite longer hospital stays, patients did not experience measurable short term clinical benefits.
From a financial perspective, Medicare did not realize meaningful savings from reinstating the rule.
This is particularly important. If a policy increases inpatient days but does not reduce postacute spending or improve outcomes, its value becomes questionable.
The length of stay increase was not uniform across all patients.
Two groups experienced larger effects:
For these populations, the increase in three day stays was more pronounced.
These groups are also more likely to require postacute rehabilitation services. The findings suggest that hospitals may be especially motivated to ensure coverage eligibility for these patients.
Even small increases in average length of stay can have significant system wide implications.
Acute care beds are limited resources. Prolonged stays can:
In many regions, hospitals continue to face capacity strain.
Additional hospital days are not neutral. They increase exposure to:
Although the study did not detect short term mortality changes, longer stays may still carry incremental risk.
The 3 day rule has already been modified in other parts of Medicare.
In Medicare Advantage, many plans have waived the requirement. In addition, the Center for Medicare and Medicaid Innovation has tested waivers within certain alternative payment models.
The editorial published alongside the study in JAMA Internal Medicine emphasized the importance of rigorously evaluating long standing policies. It argued that rules established decades ago should not be immune from modern evidence based review.
The temporary pandemic waiver provided rare real world data on what happens when the rule is removed. The reinstatement allowed researchers to observe the reverse.
Based on the study findings, several implications emerge.
The primary justification for the rule is to prevent unnecessary SNF spending. However, the data show no reduction in SNF discharge rates.
The increase in three day stays suggests that hospitals adjust behavior to meet eligibility requirements.
Total Medicare spending did not significantly decline. The rule appears to shift care timing rather than reduce utilization.
Policymakers could consider:
Further research is needed to evaluate long term effects.
Despite these limitations, the evidence is among the strongest to date on the rule’s real world impact.
The 3 day rule has been in place for more than half a century. Health care delivery has changed dramatically since then.
Payment models have evolved. Postacute care has expanded. Data systems are more sophisticated.
This study reinforces the need for modern policy evaluation. Long standing rules should be tested against contemporary evidence rather than assumed effective.
As Medicare faces financial pressure from demographic shifts and rising costs, inefficient policies become increasingly difficult to justify.
The 2026 study published in JAMA Internal Medicine provides compelling evidence that reinstating Medicare’s 3 day hospital stay rule increased inpatient length of stay without reducing skilled nursing facility utilization, Medicare spending, or short term adverse outcomes.
For policymakers, the message is clear. The rule may prolong hospital stays without delivering measurable benefits.
Whether Medicare ultimately reforms or eliminates the requirement remains to be seen. What is certain is that rigorous policy evaluation, like the analysis conducted in this study, will play a central role in shaping the future of postacute care coverage.
Chen Z, Trivedi AN, Rahman M, et al. Changes in Inpatient and Skilled Nursing Facility Care After the Medicare 3 Day Rule Reinstatement. JAMA Internal Medicine. Published online February 9, 2026. doi:10.1001/jamainternmed.2025.7838
Choi JJ, Gross CP, Ganguli I. Unproven Rules and the Need for Rigorous Policy Evaluation. JAMA Internal Medicine. Published online February 9, 2026. doi:10.1001/jamainternmed.2025.7835
This blog post is for informational and educational purposes only. It does not constitute medical, legal, or financial advice. The content summarizes findings from a peer reviewed study and accompanying editorial but does not replace professional consultation. Always consult qualified health care professionals or policy experts regarding specific clinical or regulatory questions.
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