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 classifications.
You may click the [Log In] link to sign in to the system. If you don't already have an account, it's very easy to setup one using the same link.