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Unified Medical Language System® (UMLS®)

2012AB SNOMED CT Source Information




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Notes

SNOMEDCT data files are submitted by IHTSDO.

Summary of Changes

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There have been no changes to the SNOMEDCT format or processing of the data, however atoms with DESCRIPTIONSTATUS = 7 (Inappropriate) have been assigned TTYs as follows:

DESCRIPTIONTYPE DESCRIPTIONSTATUS LANG
TTY
SUPPRESS
LAT
2 7
en-GB
IS
O
ENG
1 7
en
OP
O
ENG
1 7
en-GB
OP
O
ENG

In the future, the new SNOMEDCT RF2 format will be processed, and this document will be updated to reflect the changes.

Summary of Source-Provided Files

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The complete English-language SNOMEDCT distribution includes the following files:

Documentation and Reference (RF1):

File Name Description
Readme_en_20120731.txt Lists the files included in the release
doc_TechnicalImplementationGuide_Current-en-US_INT_20120731.pdf Technical Implementation Guide
doc1_TechnicalReferenceGuide_Current-en-US_INT_20120731.pdf Technical Reference Guide
doc_EditorialGuide_Current-en-US_INT_20120731.pdf Editorial Guide
doc_FileNamingConvention_Current-en_INT_20120731.pdf File Naming Conventions
doc_NamespaceIdentifierGuide_Current-en-US_INT_20120731.pdf Namespace Identifier Guide
doc_NamespaceIdentifierRegistry_Current-en-US_INT_20120731.pdf Namespece Identifier Registry
doc_ScopeMemo_Current-en-US_INT_20120731.pdf Scope Memo
doc_UserGuide_Current-en-US_INT_20120731.pdf User Guide
doc1_CanonicalTableGuide_Current-en-US_INT_20120731.pdf Canonical Table Guide
doc_DeveloperToolkitGuide_Current-en-US_INT_20120731.pdf Developer Toolkit Guide

Developer Toolkit

File Name Description
tls1_Index_Generator_INT_20120731.zip Index Generator software
res_DualKeyIndex_Concepts-en-US_INT_20120731.txt Dual Key Index on Concepts
res_DualKeyIndex_Descriptions-en-US_INT_20120731.txt Dual Key Index on Descriptions
res_WordKeyIndex_Concepts-en-US_INT_20120731.txt Word Key Index on Concepts
res_WordKeyIndex_Descriptions-en-US_INT_20120731.txt Word Key Index on Descriptions
res1_Canonical_Core_INT_20120731.txt Table of short canonical form relationships
res1_StatedRelationships_Core_INT_20120731.txt Table of Stated Relationships
zres_ExcludedWords_en-US_INT_20070731.txt Excluded Words for Index Generator software
der1_Subsets_DuplicateTerms_INT_20120731.txt Duplicate Terms Subsets
der1_SubsetMembers_DuplicateTerms_INT_20120731.txt Duplicate Terms Subset Members
zder1_Subsets_Navigation_INT_20030731.txt Navigation Subsets
zder1_SubsetMembers_Navigation_INT_20030731.txt Navigation Subset Members
zres_WordEquivalents_en-US_INT_20020731.txt Table of semantically similar words
tls2_StatedRelationshipsToOwlKRSS_Draft_INT_20120731.pl Perl script to make Stated Relationships

Data Files

File Name Description
sct1_Concepts_Core_INT_20120731.txt Concepts - Tab-Delimited Format
sct1_Descriptions_en_INT_20120731.txt Descriptions - Tab-Delimited Format
sct1_Relationships_Core_INT_20120731.txt Relationships - Tab-Delimited Format
sct1_ComponentHistory_Core_INT_20120731.txt Component History - Tab-Delimited Format
sct1_References_Core_INT_20120731.txt References for inactive compoenents - Tab-Delimited Format
sct1_TextDefinitions_en-US_INT_20120731.txt Textual Definitions - Tab-Delimited Format
der1_CrossMapSets_ICD9_INT_20120731.txt ICD9 Cross Map Sets - Tab-Delimited Format
der1_CrossMapTargets_ICD9_INT_20120731.txt ICD9 Cross Map Targets - Tab-Delimited Format
der1_CrossMaps_ICD9_INT_20120731.txt ICD9 Cross Maps - Tab-Delimited Format
der1_CrossMapSets_ICDO_INT_20120731.txt * ICDO Cross Map Sets - Tab-Delimited Format
der1_CrossMapTargets_ICDO_INT_20120731.txt * ICDO Cross Map Targets - Tab-Delimited Format
der1_CrossMaps_ICDO_INT_20120731.txt * ICDO Cross Maps - Tab-Delimited Format
der1_Subsets_DoseForm_INT_20120731.txt * Dose Form Subsets - Tab-Delimited Format
der1_SubsetMembers_DoseForm_INT_20120731.txt * Dose Form Subset Members - Tab-Delimited Format
der1_Subsets_en-GB_INT_20120731.txt GB English Dialect Subsets - Tab-Delimited Format
der1_SubsetMembers_en-GB_INT_20120731.txt GB English Dialect Subset Members - Tab-Delimited Format
der1_Subsets_en-US_INT_20120731.txt US English Dialect Subsets - Tab-Delimited Format
der1_SubsetMembers_en-US_INT_20120731.txt US English Dialect Subset Members - Tab-Delimited Format
der1_Subsets_VTMVMP_INT_20120731.txt * VTM and VMP Subsets - Tab-Delimited Format
der1_SubsetMembers_VTMVMP_INT_20120731.txt * VTM and VMP Subset Members - Tab-Delimited Format
zres_BridgeFile_Snomed2ToSnomedRT_INT_20020731.zip * Snomed 2 to Snomed RT Bridge File
zres_BridgeFile_Snomed35ToSnomedRT_INT_20020731.zip * Snomed 3.5 to Snomed RT Bridge File
zder1_Integration_LOINC_INT_20050731.txt * LOINC Integration file - Tab-Delimited Format

* Certain fields and files may not be directly processed because they contain redundant data or are not part of the core SNOMED CT data.

Source-Provided File Details

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Details on format of input files and representation of source data. Consult the SNOMED CT documentation for additional details.

file:sct1_Concepts_Core_INT_yyyymmdd.txt

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Concepts

# Field Name Description Representation
1 CONCEPTID SNOMEDCT concept ID MRSAT.CUI populated by the Metathesaurus CUI corresponding to CONCEPTID.
2 CONCEPTSTATUS Concept Status MRSAT.ATN="CONCEPTSTATUS"
3 FULLYSPECIFIEDNAME Fully-specified concept name with top-level hierarchical location appended in parentheses (Not processed - these names also appear as entries in the Descriptions table having DESCRIPTIONTYPE=3.)
4 CTV3ID Read Code from the UK's Clinical Terms Version 3 MRSAT.ATN="CTV3ID"
5 SNOMEDID SNOMED RT Identifier MRSAT.ATN="SNOMEDID"
6 ISPRIMITIVE Primitive flag - indicates whether concept is primitive or fully defined MRSAT.ATN="ISPRIMITIVE"

file:sct1_Descriptions_en_INT_yyyymmdd.txt

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Descriptions

# Field Name Description Representation
1 DESCRIPTIONID SNOMEDCT Description ID MRCONSO.SAUI
2 DESCRIPTIONSTATUS* Description Status MRSAT.ATN="DESCRIPTIONSTATUS"

A combination of the "DESCRIPTIONSTATUS," "DESCRIPTIONTYPE," and "LANGUAGECODE" values are used to determine MRCONSO.TTY assignment
3 CONCEPTID Concept ID of the associated concept MRCONSO.SCUI and MRCONSO.CODE; for attributes, MRSAT.CUI populated by the Metathesaurus CUI corresponding to CONCEPTID
4 TERM Text of a term used to describe the associated concept MRCONSO.STR
5 INITIALCAPITALSTATUS 1=capitalization status of first character of TERM is significant,
0=capitalization status of first character of TERM is not significant
MRSAT.ATN="INITIALCAPITALSTATUS"
6 DESCRIPTIONTYPE* Indicates whether the term is the Preferred Term (1), a Synonym (2), or the FullySpecifiedName (3) of the associated concept; a value of 0 indicates the type will be assigned by a Subset that includes the term MRSAT.ATN="DESCRIPTIONTYPE"

A combination of the "DESCRIPTIONSTATUS," "DESCRIPTIONTYPE," and "LANGUAGECODE" values are used to determine MRCONSO.TTY assignment
7 LANGUAGECODE* The 2-character ISO639-1 code indicating the language of the term, optionally followed by a hyphen and a subcode string indicating a dialect; if the dialect is general to an entire country, the subcode will be the two-letter ISO 3166 country code MRSAT.ATN="LANGUAGECODE"

A combination of the "DESCRIPTIONSTATUS," "DESCRIPTIONTYPE," and "LANGUAGECODE" values are used to determine MRCONSO.TTY assignment

 *  TTY assignment is based on a combination of fields from sct1_Descriptions_en_INT_yyyymmdd.txt: DESCRIPTIONSTATUS, DESCRIPTIONTYPE, and LANGUAGECODE.  In some cases, the MEMBERSTATUS field of der1_Subsets_en-US_INT_yyyymmdd.txt may be a factor.  The assignments are as follows:



DESCRIPTIONSTATUS DESCRIPTIONTYPE LANGUAGECODE TTY
0 0 en PT or SY:
TTY assigned based on MEMBERSTATUS field of
der1_Subsets_en-US_INT_yyyymmdd.txt
(1 ==> PT; 2 ==> SY)
See TTY descriptions for details.
0 1 en PT
0 1 en-GB PTGB
0 1 en-US PT
0 2 en SY
0 2 en-GB SYGB
0 2 en-US SY
0 3 en FN
1 1 en-GB OP
1 2 en IS
1 2 en-GB IS
1 3 en OF
6 1 en OP
6 1 en-GB OP
6
1 en-us
OP
6 2 en IS
6 2 en-GB IS
6 2 en-US IS
6 3 en OF
7
1
en
OP
7
1
en-GB
OP
7
2
en-GB
IS
7 2 en IS
8 1 en OP
8 1 en-GB OP
8 1 en-US OP
8 2 en IS
8 2 en-GB IS
8 2 en-US IS
8 3 en OF

file:sct1_Relationships_Core_INT_yyyymmdd.txt


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Relationships

# Field Name Description Representation
1 RELATIONSHIPID SNOMEDCT Relationship ID MRREL.SRUI
2 CONCEPTID1 SNOMEDCT Concept ID of relationship's source concept MRREL.CUI2 populated by the Metathesaurus CUI corresponding to CONCEPTID1
3 RELATIONSHIPTYPE SNOMEDCT Concept ID of concept representing the relationship between the related concepts A relationship-name mapping is used to set MRREL.REL and MRREL.RELA based on this value.

These mappings are expressed as attributes with MRSAT.ATN="UMLSREL" and MRSAT.ATN="UMLSRELA", specifying the REL and RELA values used for eacah RELATIONSHIPTYPE.   For historical reasons, however, the UMLSREL attribute values "RT" and "NT" are used for REL values in MRREL.RRF of "RO" and "RN", respectively
4 CONCEPTID2 SNOMEDCT Concept ID of relationship's target concept MRREL.CUI1 populated by the Metathesaurus CUI corresponding to CONCEPTID2
5 CHARACTERISTICTYPE Indicates whether this relationship is a defining (0), qualifying (1), historical (2), or other additional (3) characteristic of the source concept. MRSAT.ATN="CHARACTERISTICTYPE" where MRSAT.METAUI is the MRREL.RUI assigned where MRREL.SRUI = this relationship's RELATIONSHIPID

Also used to create MRSAT.ATN="AQ" where CHARACTERISTICTYPE = 1 (qualifier) and REFINABILITY = 2 (mandatory)
6 REFINABILITY Indicates whether the target concept must (2), may (1), or may not (0) be refined when using this relationship as a clinical data entry template. MRSAT.ATN="REFINABILITY" where MRSAT.METAUI is the MRREL.RUI assigned where MRREL.SRUI = this relationship's RELATIONSHIPID

Also used to create MRSAT.ATN="AQ" where CHARACTERISTICTYPE = 1 (qualifier) and REFINABILITY = 2 (mandatory)
7 RELATIONSHIPGROUP An integer indicating whether this relationship is (if non-zero) or is not (if 0) associated with other relationships. When non-zero, all relationships having the same CONCEPTID1 and RELATIONSHIPGROUP values are associated. MRREL.RG

file:sct1_ComponentHistory_Core_INT_yyyymmdd.txt

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Component History

# Field Name Description Representation
1 COMPONENTID SNOMEDCT ID for the changed component MRHIST.SOURCEUI
MRHIST.CHANGEKEY = DESCRIPTIONSTATUS if COMPONENTID is a DESCRIPTIONID
MRHIST.CHANGEKEY = CONCEPTSTATUS if COMPONENTID is a CONCEPTID
2 RELEASEVERSION SNOMEDCT version in which the change was made MRHIST.SVER
3 CHANGETYPE Indicates the type of change that occurred MRHIST.CHANGETYPE
4 STATUS Indicates the component's status after the change MRHIST.CHANGEVAL
5 REASON Textual description of the reason for the change MRHIST.REASON

file:sct1_References_Core_INT_yyyymmdd.txt

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References for inactive components

# Field Name Description Representation
1 COMPONENTID SNOMEDCT ID for the inactive component MRREL.CUI2 populated by the Metathesaurus CUI corresponding to COMPONENTID
2 REFERENCETYPE Indicates type of relationship between the inactive component and the referenced component MRREL.REL and MRREL.RELA mapped from REFERENCETYPE
3 REFERENCEDID SNOMEDCT ID for the referenced component MRREL.CUI1 populated by the Metathesaurus CUI corresponding to REFERENCEDID

file:sct1_TextDefinitions_en-US_INT_yyyymmdd.txt

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Textual Definitions

# Field Name Description Representation
1 CONCEPTID SNOMEDCT concept ID MRDEF.CUI populated by the Metathesaurus CUI corresponding to CONCEPTID
2 SNOMEDID SNOMED RT Identifier Not used - this information is duplicated from the Concepts table
3 FULLYSPECIFIEDNAME Concept's fully specified name Not used - this information is duplicated from the Concepts table
4 DEFINITION Textual definition of the concept MRDEF.DEF

file:der1_CrossMapSets_ICD9_INT_yyyymmdd.txt

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ICD9 Cross Map Sets

# Field Name Description Representation
1 MAPSETID SNOMEDCT Cross Map Set ID MRCONSO.SCUI and CODE for an atom with SAB="SNOMEDCT", TTY="XM";
for attributes, MRSAT.CUI populated by the Metathesaurus CUI corresponding to the XM atom for this MAPSETID
2 MAPSETNAME A name describing this Cross Map Set MRSAT.ATN="MAPSETNAME"
3 MAPSETTYPE Indicates the type of maps in this set:
0 => Unspecified
1 => Single (all one-to-one maps)
2 => Multiple (some one-to-many maps, but no maps to a list of choices)
3 => Choices (some maps specify a choice of multiple one-to-one maps, but no one-to-many maps)
4 => Flexible (some one-to-many maps, and some maps specifying choices)
MRSAT.ATN="MAPSETTYPE"
4 MAPSETSCHEMEID Standard ID for the Target Scheme the map set belongs to MRSAT.ATN="MAPSETSCHEMEID"
5 MAPSETSCHEMENAME Full name of the map set Target Scheme MRSAT.ATN="MAPSETSCHEMENAME"
6 MAPSETSCHEMEVERSION Version number of the Target Scheme, as published by the issuing organization MRSAT.ATN="MAPSETSCHEMEVERSION"
7 MAPSETREALMID Identifier of the realm in which the map set is applicable MRSAT.ATN="MAPSETREALMID"
8 MAPSETSEPARATOR The character used as a separator when a map target includes multiple codes MRSAT.ATV set to XML entity code for this character with MRSAT.ATN="MAPSETSEPARATORCODE"
9 MAPSETRULETYPE Indicates the types of rules used in this map set's cross maps and cross map targets MRSAT.ATN="MAPSETRULETYPE"

file:der1_CrossMapTargets_ICD9_INT_yyyymmdd.txt

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ICD9 Cross Map Targets

# Field Name Description Representation
1 TARGETID SNOMEDCT ID for this Cross Map Target MRMAP.TOID, MRMAP.TOSID; MRMAP.TOTYPE set to "BOOLEAN_EXPRESSION_SDUI"
2 TARGETSCHEMEID Standard ID for the Target Scheme this target belongs to Checked for matching the MAPSETSCHEMEID of the Cross Map Set for ICD9
3 TARGETCODES A code or list of codes from the Target Scheme that may be mapped to from SNOMEDCT concepts MRMAP.TOEXPR (computed from TARGETCODES by replacing the MAPSETSEPARATOR character with " AND ")
4 TARGETRULE A machine-processable expression of rules that determine when this target applies MRMAP.TORULE
5 TARGETADVICE Textual advice describing when this target applies (this field is currently always blank)

file:der1_CrossMaps_ICD9_INT_yyyymmdd.txt

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ICD9 Cross Maps

# Field Name Description Representation
1 MAPSETID SNOMEDCT Cross Map Set ID MRMAP.MAPSETCUI populated by the Metathesaurus CUI corresponding to MAPSETID
2 MAPCONCEPTID SNOMEDCT ID of the mapped concept MRMAP.FROMID, MRMAP.FROMEXPR
3 MAPOPTION An integer distinguishing between alternative mappings for a concept (this field is currently always 0)
4 MAPPRIORITY An integer indicating the suggested order for presenting a list of options for mapping a concept MRMAP.MAPRANK
5 MAPTARGETID The SNOMEDCT ID of a Cross Map Target that this concept may be mapped to Matched to the TARGETID column of the Cross Map Targets table to find the data for the "To" side of the mapping in MRMAP
6 MAPRULE A machine processable expression of rules to determine when this Cross Map applies MRMAP.MAPRULE
7 MAPADVICE Textual advice to support a person deciding when this Cross Map applies (this field is currently always blank)

file:der1_Subsets_en-GB_INT_yyyymmdd.txt

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GB English Dialect Subsets

# Field Name Description Representation
1 SUBSETID SNOMEDCT ID for this subset MRCONSO.SCUI and CODE for an atom with SAB="SNOMEDCT", TTY="SB";
for attributes, MRSAT.CUI populated by the Metathesaurus CUI corresponding to the SB atom for this SUBSETID
2 SUBSETORIGINALID The SNOMEDCT ID of the original subset of which this is an updated version MRSAT.ATN="SUBSETORIGINALID"
3 SUBSETVERSION The version number of this release of the subset MRSAT.ATN="SUBSETVERSION"
4 SUBSETNAME The name of this subset MRCONSO.STR for the SNOMEDCT/SB atom with CODE=SUBSETID
5 SUBSETTYPE Indicates the type of the subset and what kind of components it includes MRSAT.ATN="SUBSETTYPE"
6 LANGUAGECODE The 2-character ISO639-1 code indicating the language of the subset, optionally followed by a hyphen and a subcode string indicating a dialect; if the dialect is general to an entire country, the subcode will be the two-letter ISO 3166 country code MRSAT.ATN="SUBSETLANGUAGECODE"
7 REALMID Identifies the realm the subset applies to MRSAT.ATN="SUBSETREALMID"
8 CONTEXTID May identify the context domain the subset applies to MRSAT.ATN="SUBSETCONTEXTID"

file:der1_SubsetMembers_en-GB_INT_yyyymmdd.txt

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GB English Dialect Subset Members

# Field Name Description Representation
1 SUBSETID SNOMEDCT ID of the subset containing this member First ~-separated component of MRSAT.ATV for where MRSAT.ATN="SUBSETMEMBER"
2 MEMBERID SNOMEDCT ID of this subset member (may be a description, concept, or relationship ID) MRSAT.METAUI for MRSAT.ATN="SUBSETMEMBER" populated by the Metathesaurus AUI corresponding to MEMBERID
3 MEMBERSTATUS Integer specifying the type, status, or order of this member in this subset Second ~-separated component of MRSAT.ATV for where MRSAT.ATN="SUBSETMEMBER"
4 LINKEDID (valid for Navigation and Duplicate Terms subsets only) Third ~-separated component of MRSAT.ATV for where MRSAT.ATN="SUBSETMEMBER"

file:der1_Subsets_en-US_INT_yyyymmdd.txt

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US English Dialect Subsets

# Field Name Description Representation
1 SUBSETID SNOMEDCT ID for this subset MRCONSO.SCUI and CODE for an atom with SAB="SNOMEDCT", TTY="SB";
for attributes, MRSAT.CUI populated by the Metathesaurus CUI corresponding to the SB atom for this SUBSETID
2 SUBSETORIGINALID The SNOMEDCT ID of the original subset of which this is an updated version MRSAT.ATN="SUBSETORIGINALID"
3 SUBSETVERSION The version number of this release of the subset MRSAT.ATN="SUBSETVERSION"
4 SUBSETNAME The name of this subset MRCONSO.STR for the SNOMEDCT/SB atom with CODE=SUBSETID
5 SUBSETTYPE Indicates the type of the subset and what kind of components it includes MRSAT.ATN="SUBSETTYPE"
6 LANGUAGECODE The 2-character ISO639-1 code indicating the language of the subset, optionally followed by a hyphen and a subcode string indicating a dialect; if the dialect is general to an entire country, the subcode will be the two-letter ISO 3166 country code MRSAT.ATN="SUBSETLANGUAGECODE"
7 REALMID Identifies the realm the subset applies to MRSAT.ATN="SUBSETREALMID"
8 CONTEXTID May identify the context domain the subset applies to MRSAT.ATN="SUBSETCONTEXTID"

file:der1_SubsetMembers_en-US_INT_yyyymmdd.txt

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US English Dialect Subset Members

# Field Name Description Representation
1 SUBSETID SNOMEDCT ID of the subset containing this member First ~-separated component of MRSAT.ATV for where MRSAT.ATN="SUBSETMEMBER"
2 MEMBERID SNOMEDCT ID of this subset member (may be a description, concept, or relationship ID) MRSAT.METAUI for MRSAT.ATN="SUBSETMEMBER" populated by the Metathesaurus AUI corresponding to MEMBERID
3 MEMBERSTATUS Integer specifying the type, status, or order of this member in this subset Second ~-separated component of MRSAT.ATV for where MRSAT.ATN="SUBSETMEMBER"
4 LINKEDID (valid for Navigation and Duplicate Terms subsets only) Third ~-separated component of MRSAT.ATV for where MRSAT.ATN="SUBSETMEMBER"