A FSN is composed of a term and a “semantic tag” between parenthesis at its end (e.g. |Myocardial biopsy (procedure)|). The tag indicates the hierarchy to which the concept belongs (e.g. procedure, disorder, organism, etc.). Each concept has a FSN, which is unique in SNOMED CT in a given language, even in cases of FSNs with identical terms that refer to concepts belonging to different categories.