Table 1.

Five Most Common Types of Merges Across SNOMED CT Hierarchies in the Unified Medical Language System

SNOMED CT Hierarchies Involved	Examples of Merged SNOMED CT Concepts	No. of Merges
“Product” and “substance”	“Antacid (product)” and “antacid (substance)”	2957
“Clinical finding” and “body structure”	“Stab wound (disorder)” and “Stab wound (morphologic abnormality)”	978
“Clinical finding” and “context-dependent category”	“Eye symptoms (finding)” and “eye symptom findings (context-dependent category)”	784
“Clinical finding” and “observable entity”	“Antenatal screening finding (finding)” and “antenatal screening finding (observable entity)”	142
“Procedure” and “qualifier value”	“Vascular surgery procedure (procedure)” and “vascular surgery (qualifier value)”	79