Ransomware disrupts some operations of kidney dialysis company DaVita

Kidney dialysis company DaVita said a ransomware attack on Saturday has impacted some of its operations and encrypted parts of its network. 

The company notified the U.S. Securities and Exchange Commission of the incident on Monday morning, warning that contingency plans have been implemented but they continue to provide care to patients. 

“Upon discovery, we activated our response protocols and implemented containment measures, including proactively isolating impacted systems,” officials explained. “However, the incident is impacting some of our operations, and while we have implemented interim measures to allow for the restoration of certain functions, we cannot estimate the duration or extent of the disruption at this time.”

DaVita said it is still too early to determine the overall effect of the attack on the company.  

The company, which reported $12.8 billion in revenue last year, is one of the largest kidney care providers, with about 281,100 patients at 3,166 outpatient dialysis centers worldwide. DaVita operates more than 2,500 centers in the U.S. and hundreds more across 13 other countries. 

Its primary function is treating end-stage renal disease which necessitates kidney dialysis three times per week until patients receive a new kidney. 

No ransomware gang had taken credit for the attack on DaVita as of Monday morning. The company did not respond to requests for comment about what group launched the attack or whether a ransom would be paid. 

Cybersecurity experts have tracked more than 100 ransomware attacks on healthcare organizations in 2025, with dozens of hospitals, clinics, labs and more facing operational issues due to security incidents.

Microsoft warned last month that ransomware attacks continue to be the primary concern for rural hospitals because of the disruptions to patient care and inability to pay ransoms compared to larger hospital networks. 

Ransomware attacks often “represent a tipping point toward closure, impacting not just the hospital, but the communities they serve with potentially life-threatening consequences,” said Microsoft official Kate Behncken.