Expand takes the ValueSet on top of the stack, and uses the current Scope to expand all the codes in the ValueSet The resulting ValueSet is then placed back on top of the stack.
> fhir expand
The expand command can only be used by licensed customers of Simplifier.
The current expand command is limited to regular ValueSets, so special cases like SNOMETD need to be done on a FHIR server. The expand command is cucrrent limited to 1.000.000 codes. That should be enough for most ValueSets. Beware that it can take a long time though.