For the ambulatory service setting, the service unit is equivalent to an organisation's ambulatory services as a whole. However, ambulatory service units should be differentiated by target population. Where an organisation provides multiple teams serving the same target population, these may be grouped and reported as a single service unit, or identified as individual service units in their own right. Ambulatory services would be separately identifiable as service units using the Specialised mental health service—target population group, code N data element. For additional information, please refer to the glossary item Ambulatory mental health care service. The complete identifier string, including State/Territory identifier, Region identifier, Organisation identifier, Service unit cluster identifier and Ambulatory service unit identifier, should be a unique code for the service unit in that state/territory. Service unit reporting structures should be identical between all mental health collections (e.g., Mental Health National Minimum Data Sets and the Mental Health National Outcomes and Casemix Collection (NOCC)).