Large complex terminologies: more coding choice, but harder to find data--reflections on introduction of SNOMED CT (Systematized Nomenclature of Medicine--Clinical Terms) as an NHS standard.

SNOMEDCT stands for the SystematizedNomenclature of Medicine Clinical Terms, and consists of comprehensive scientifically validated content. SNOMED CT is available in more than 50 countries and has been adopted as the standard clinical terminology for the NHS in England’. This Editorial explores whether this should be cause for widespread rejoicing among the health informatics community or whether there are concerns about using such a large and complex system. History