Abstract: An electronic healthcare data de-identification system can accept data containing personally-identifiable information and output de-identified healthcare data that is uniquely identifiable and has preserved temporal order. The unique identity of the de-identified healthcare data is preserved with universally unique identifiers and the temporal order of the de-identified healthcare data is maintained with universally unique sequence values that synchronize the timing of healthcare events. The embodiments described herein make healthcare data more accessible to users without endangering their privacy and allow conclusions to be made from large sets of data without restricting its use due to privacy concerns. Other embodiments are also described.