** Shares of dialysis firm DaVita DVA.N fall 4% to $149.4

** DVA says it was hit by a ransomware attack that encrypted certain elements of its network, and some of its operations remained disrupted despite interim measures

** While co continued to provide patient care as it took measures to restore certain functions, it could not "estimate the duration or extent of the disruption at this time" - DVA said in a regulatory filing

** The measures included separating some impacted systems from its network

** DaVita discovered the cyberattack on Saturday and is now assessing the incident with third-party cybersecurity professionals

** Co says it has also notified law enforcement about the attack

** Up to last close, stock had fallen 0.7% YTD

(Reporting by Siddhi Mahatole)

((siddhi.mahatole@thomsonreuters.com))