Classifications like ICD often include such kind of “catch-all” codes as NEC(not elsewhere classified) codes. Terminologies/Ontologies, such as SNOMED CT, don’t like these concepts which meanings are not persistent depending on the other sibling codes.
You will never get a snomed ct code for such a concept.
Maybe it’s a open-vs-closed world issue.
Related Links:
When Is Content Rejected?
https://confluence.ihtsdotools.org/pages/viewpage.action?pageId=71172163
Comparison between a SNOMED CT Problem List and the ICD-10-CM/PCS HIPAA Code Sets
http://library.ahima.org/doc?oid=301254#.XrXwBda-sTk