ATS 2026
Pneumonia deaths rise at hospitals acquired by private equity
Clinical Takeaway: Ownership changes at hospitals appear to track with clinically meaningful shifts in outcomes for common pulmonary admissions. The findings strengthen the case for closer regulatory scrutiny of private equity acquisitions in health care.
Private equity ownership of U.S. hospitals has expanded rapidly over the past two decades, with earlier studies linking these acquisitions to worse patient experiences and higher rates of in-hospital adverse events such as falls and bloodstream infections. Less is known about how ownership changes affect outcomes for specific diseases, despite COPD and pneumonia being among the most common reasons for hospital admission in the country.
In-hospital mortality among pneumonia patients rose by nearly 1 percentage point after private equity acquisition compared with matched non-acquired hospitals. That shift sounds modest in absolute terms, but pneumonia in-hospital mortality typically runs only 3% to 4%, making the relative increase substantial. COPD patients saw a 1-percentage-point increase in 30-day readmissions, a meaningful shift against typical baseline rates of roughly 20%.
The pattern is consistent with the financial structure of private equity ownership, which tends to prioritize short-horizon returns. Earlier evidence has tied acquisitions to staffing changes and cost-cutting that could plausibly affect care for patients with conditions requiring close monitoring, timely escalation, and reliable post-discharge follow-up.
Researchers analyzed more than 146,900 COPD encounters and 194,900 pneumonia encounters at private equity-acquired hospitals, then matched those facilities with non-acquired hospitals to compare outcomes. The findings haven't yet undergone peer review.
If the findings hold up under peer review and prospective analysis, they shift the policy conversation from broader concerns about patient experience and adverse events into hard outcomes that directly affect survival. They also raise practical questions for clinicians referring patients across hospital systems and for patients themselves trying to evaluate where to seek care for acute pulmonary conditions.
"Our findings add to growing concerns around the detrimental effects of private equity in health care and highlight a critical need for stronger regulations of these acquisitions to protect our patients," said first author Stephen Mein, MD, of Beth Israel Deaconess Medical Center.
Source: Mein S. ATS 2026. May 19, 2026. Clinical outcomes for pulmonary conditions worsened after private equity acquisition of U.S. hospitals