Table 2. Definition of concept coverage scores for ASSESS CT manual annotation.

Score	Definition
Full coverage	When the meaning of a chunk is fully represented by a set of codes, e.g. the term “Heart attack” is fully covered with “22298006 | Myocardial infarction (disorder)|”.
Inferred coverage	When the meaning of elliptic or ambiguous chunks of text can be inferred from the context and can be fully represented by a set of codes, e.g. a specific use of the term “hypertension” could mean “Renal arterial hypertension”, so the code “39018007 | Renal arterial hypertension (disorder)|” is justified.
Partial coverage	When the meaning of the chunk comes close to the meaning of a set of codes, e.g. “Third rib fracture” is more specific than the code “20274005 | Fracture of one rib (disorder)|”. Yet the meaning is close enough to justify annotation with this code.
None	When there is not any set of codes that has a closer meaning to the chunk, e.g. generic codes such as “125605004 | Fracture of bone (disorder)|” for coding “third rib fracture” must not be used as partial coverage.