The Individual Health Identifier is the unique number given to a patient which allows them to be identified by all of the Electronic Health Record systems across healthcare organisations in Ireland. The use of a single identifier is a way to ensure that the correct information on each patient is combined with the national record and avoids data on the wrong patient being sent. An IHI is being introduced in the Irish Health Service and an IHI office is being established and will be tasked with assigning IHI numbers to Irish citizens. The IHI replaces the different ‘Medical Record Number’ systems used across the health and social care systems. The IHI is only used as an identifier, it does not contain any medical information.