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The meaning of coded clinical data encoded using 

Gloss
t SNOMED International
GlosTermSNOMED International (version of SNOMED)
 is maintained using SNOMED CT mechanisms that support

concept permanence and version control. Even when a

Glossary ref
Concept

is

Glossary ref
retired

from

Glossary ref
active

use its code is never reassigned to another

Glossary ref
Concept

.

Concept permanence ensures that codes assigned in 

Gloss
t SNOMED International
GlosTermSNOMED International (version of SNOMED)
 are retained, accessible, and not reused. The codes used in are present in

Glossary ref
SNOMED CT

in the

Scg expression
ShowPartsid+term
900000000000498005|SNOMED RT ID simple map reference set|

which links the old alphanumeric codes to the

Glossary ref
SNOMED CT concept identifiers

. Please note the file containing this simple map reference set is no longer part of the SNOMED CT International Edition but is provided in a static resource package call the "SNOMED CT Identifier Reference Set resource package". This is available for download from the Member Licensing and Distribution Service (MLDS). For further information about the structure of this map reference set please see the specification of Simple map reference sets

The

Scg expression
ShowPartsid+term
900000000000498005|SNOMED RT ID simple map reference set|

can be used either to allow recognition of legacy data by

Glossary ref
SNOMED CT

retrieval tools or to enable mapping of the codes and storage of the appropriate

Glossary ref
Concept Identifier

.