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Foundation
The ICD Foundation Component

The Foundation Component represents the entire WHO-FIC universe. It is a multidimensional collection of interconnected entities and synonyms. These entities consist of diseases, disorders, injuries, external causes, signs and symptoms, functional descriptions, interventions, and extension codes. ICD-11 statistical core (MMS) is derived from this foundation, ICF and ICHI will follow.
The entities in the Foundation Component:
1. are not necessarily mutually exclusive
2. allow multiple parenting ( i. e. an entity may be in more than one branch, for example tuberculosis meningitis is both an infection and a brain disease)
Linearizations
The Linearizations
A linearization is a subset of the foundation component, that is:
1. Fit for a particular purpose: reporting mortality, morbidity, or other uses
2. Composed of entities that are Mutually Exclusive of each other
3. Each entity is given a single parent
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.
Proposals

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Info

Introduction
- Release Notes
- Basic Information
ICD11 Architecture
- General Information
User Accounts
- Registering and Signing in
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Browsing using the Hierarchy
Searching
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Postcoordination
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Contributing to ICD-11 Development
- General Information
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Proposal System
Notifications
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Translation Platform

Browsing Linearizations

By default the browser displays the foundation component. You may switch the view to any of the linearizations using the Linearizations menu

The following are the main differences between browsing the linearization and browsing the foundation component

When you browse a linearization, only entities that are in that linearization are visible in the hierarchy
In addition to the title there is also an ICD11 code visible for the entity. (Please note that these codes are subject to change as the development of ICD11 continues)
In the linearization there there is only one parent per entity where as there may be more than one in the foundation component
As a result of item 3, an entity may have more children in the foundation than in the linearization. These additional children are still visible in the linearization view but show up as grayed out.

All of the content model parameters are not shown in the linearization view. Only title, synonyms, definition, inclusions and exclusions are visible