Change Healthcare, a major U.S. healthcare technology firm, has confirmed a cyberattack causing network disruptions. In response, the company proactively disconnected its systems to contain the breach, anticipating at least a day-long service interruption. The nature of the incident remains undisclosed, but it has led to widespread inaccessibility of Change Healthcare’s services, affecting local pharmacies’ ability to process insurance-based prescriptions. The company, which processes 15 billion healthcare transactions annually, was acquired by UnitedHealth Group in a $7.8 billion deal, merging with Optum to manage extensive patient data. Neither Optum nor UnitedHealth Group has commented on the incident.