The statement of scope for the International Release is that it includes content necessary for international conformance and interoperability.
Content that is within the scope of the International Release is restricted to the International Release and may not be modified or replaced by an extension, unless explicitly permitted by SNOMED International.
SNOMED CT has an international and multilingual scope and can be localized to represent meanings and terms unique to particular organizations or localities. There are three dimensions to the scope of SNOMED CT:
International release criteria include affirmative answers to the following:
A National Extension includes content outside of the scope of the International Release, but necessary for national conformance and interoperability. Each member-state determines the application and interpretation of this scope and whether or not concepts should be added to their extension.
National Extension criteria include affirmative answers to the following:
SNOMED CT is not intended to cover all medical knowledge. Content that is strictly non-human is out of the scope of SNOMED CT.
Examples of non-human content,
Neither does SNOMED CT attempt to capture probabilistic or uncertain knowledge.