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SNOMED CT concepts are related to one another within a subtype hierarchy. At the top of this hierarchy are general concepts referred to as top-level concepts. Clinically relevant concepts in SNOMED CT fall under one of the hierarchies shown in 

Caption ref
Idclinical-hierarchies
.

Caption table
Idclinical-hierarchies
Clinically Relevant SNOMED CT Hierarchies

scg-expression

Concept
ShowFormat
t
block
404684003
|Clinical
finding|
71388002
|Procedure|
363787002
|Observable
entity|
410607006
|Organism|
123037004
|Body
structure|
373873005
|Pharmaceutical
/
biologic
product|
scg-expression

Concept
ShowFormat
t
block
123038009
|Specimen|
105590001
|Substance|
260787004
|Physical
object|
78621006
|Physical
force|
362981000
|Qualifier
value|
243796009
|Situation
with
explicit
context|

scg-expression

Concept
ShowFormat
t
block
419891008
|Record
artifact|
272379006
|Event|
254291000
|Staging
and
scales|
48176007
|Social
context|
308916002
|Environment
or
geographical
location|

Concept Model

SNOMED CT concepts are also related to one another by defining relationships which represent characteristics of the meaning of a concept. Each of these relationships represents the value of an attribute. SNOMED CT currently uses more than fifty defining attributes, each of which is identified by a concept.

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