See this thread: Standardizing procedures (call for non-US based collaborators)
SNOMED CT will not introduce certain granularity (by policy). And this is a big problem for analysis. So SNOMED Extension for procedures may at some point be in the cards (or use national SNOMED CT realms).
In addition to b) and c) - my project (linked above) aims to collect all ‘too granular’ procedures that lack good target at the moment.
So please submit ‘unmappable procedures’ (ideally with titles translated to English; a problem often) to the community. (By posting on the forum). Quantify them with some usage rank so that we know which are more frequent than others. Can you please contact me by email. (for that procedure study). (vojtech.huser at nih.gov)