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A pre-coordinated term has a single code associated the termwith it. A term may consist of one or more words. A well-defined collection of words represents a concept or thing.

For example, RadLex assigns the code RID1276 to the term left upper lobe bronchus.

A post-coordinated term has two or more codes that represent a collection of concatenated words. It concatenates preexisting terms to create a new concept. The concept is represented by a collection of concatenated codes ordered by when a word appears in the term.

For example, left and lung are concatenated words. Left lung is a term but preexisting terms. Concatenated, they become left lung, to which the National Cancer Thesaurus assigns it two codes, C25229 and C12468.