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Foundation Component is a collection of ALL ICD entities like diseases, disorders... It represents the whole ICD universe.
In a simple way, the foundation component is similar to a “store” of books or songs. From these elements we build a selection as a linearization. This analogy may however be misleading because there are many links between the ICD entities (like parent-child relations and other).
The ICD entities in the Foundation Component:Linearizations are similar to the classical print versions of ICD Tabular List (e.g. volume I of ICD-10 or other previous editions). Various linearizations could be built at different granularity, use case or other purposes such as for Primary Care, Clinical Care or Research. The linkage from the foundation component to a particular linearization will ensure consistent use of the ICD.