A "preventable" lapse by a contracted service provider to carry out a required security update caused a nine-and-a-half-hour disruption across Singapore's public healthcare clusters on Oct 13, Senior Minister of State for Health Tan Kiat How told parliament on Tuesday (Nov 3). About 4,000 outpatient appointments were rescheduled, with some patients facing delays of up to two hours. No patient-safety incidents linked to the disruption were reported.