This extension is used to describe a unit's (Location or Organization) place in the Swedish HSA hierarchy. There are two important levels in the hierarchy:

HSA Vårdgivare (eng HSA Care Provider) - This is often a region or private healthcare provider and the highest defined level in the hierarchy HSA Vårdenhet (eng HSA Department) - This is often a department within a region or private healthcare provider and the lower defined level in the hierarchy All official healthcare units in Sweden will have a representation in the national HSA catalogue, and all will have a relationship to a parent HSA Vårdenhet (lower level) and/or HSA Vårdgivare (highest level).

This can among other things be used to evaluate PDL (Patientdatalagen, eng Patient Data Law) rules.