documentation:vocabulary:icd9cm
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documentation:vocabulary:icd9cm [2015/06/14 06:29] cgreich |
documentation:vocabulary:icd9cm [2015/09/13 12:27] cgreich [Concept Relationships] |
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| ===== ICD9CM ===== | ===== ICD9CM ===== | ||
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| - | ==== Overview ==== | ||
| ICD9CM, usually spelled "ICD-9-CM", is a coding system in the USA, which is based on the WHO ICD9 coding system but has multiple additions and modifications. | ICD9CM, usually spelled "ICD-9-CM", is a coding system in the USA, which is based on the WHO ICD9 coding system but has multiple additions and modifications. | ||
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| ==== Concept Relationships ==== | ==== Concept Relationships ==== | ||
| There are types of relationships for ICD9CM: Mapping and hieararchical relationships. | There are types of relationships for ICD9CM: Mapping and hieararchical relationships. | ||
| - | - Direct ICD9CM to SNOMED maps recorded as "Maps to" relationships. These are manually curated based on input from UMLS (connection through common CUIs) and through MedDRA through ICD9CM to MedDRA maps in combination to MedDRA to SNOMED maps (see there). | + | |
| - | - Maps for Concepts that do not represent entities at the time of recording. For example, Concepts for history of, family history of, need for vaccination, etc. refer to observations that are recorded at a certain time, but the medical entity they are referring to, such as the disease for which family history is recorded, occurred at a different unspecified time earlier. These codes are mapped to SNOMED Observation Concepts using the "Maps to" relationship, and to the relevant medical entity to the "Maps to value" relationship. For example, ICD9CM 249.21 "Secondary diabetes mellitus with hyperosmolarity, uncontrolled" is mapped to Concept 195771 "Secondary diabetes mellitus" as well as 444369 "Hyperosmolality". These multiple mappings can sometimes involve target Concepts of different domains. For example, ICD9CM 679.10 "Fetal complications from in utero procedure" is mapped to the Procedure 4043197 "Procedure on uterus" as well as the Condition 436489 "Complication of obstetrical surgery AND/OR procedure". | + | === ICD9CM to SNOMED map === |
| - | - Hierarchical relationships between 3, 4 and 5-characer Concepts. These are constructed for those Concepts where the shorter code is entirely subsumed by longer one. Note that these relationships also exist between 3 and 5-digit codes according to these rules, which deviates from the preferred convention that "Subsumes" and "Is a" relationships only exist between directly related Concepts. | + | These are recorded as "Maps to" relationships. These are manually curated based on input from UMLS (connection through common CUIs) and through MedDRA through ICD9CM to MedDRA maps in combination to MedDRA to SNOMED maps (see there). |
| + | |||
| + | === ICD9CM to SNOMED map for for Concepts that do not represent entities at the time of recording === | ||
| + | For example, Concepts for history of, family history of, need for vaccination, etc. refer to observations that are recorded at a certain time, but the medical entity they are referring to, such as the disease for which family history is recorded, occurred at a different unspecified time earlier. These codes are mapped to SNOMED Observation Concepts using the "Maps to" relationship, and to the relevant medical entity to the "Maps to value" relationship. For example, ICD9CM 249.21 "Secondary diabetes mellitus with hyperosmolarity, uncontrolled" is mapped to Concept 195771 "Secondary diabetes mellitus" as well as 444369 "Hyperosmolality". These multiple mappings can sometimes involve target Concepts of different domains. For example, ICD9CM 679.10 "Fetal complications from in utero procedure" is mapped to the Procedure 4043197 "Procedure on uterus" as well as the Condition 436489 "Complication of obstetrical surgery AND/OR procedure". | ||
| + | |||
| + | === Hierarchical relationships between 3, 4 and 5-characer Concepts === | ||
| + | These are constructed for those Concepts where the shorter code is entirely subsumed by longer one. Note that these relationships also exist between 3 and 5-digit codes according to these rules, which deviates from the preferred convention that "Subsumes" and "Is a" relationships only exist between directly related Concepts. | ||
| ==== Hierarchy ==== | ==== Hierarchy ==== | ||
| ICD9CM Concepts are non-Standard Concepts and therefore do not participate in the hierarchy of the OMOP Standardized Vocabularies CONCEPT_ANCESTOR table. However, the relationships between corresponding 3, 4 and 5-character Concepts exist as Concept Relationships in the CONCEPT_RELATIONSHIP table (see above). | ICD9CM Concepts are non-Standard Concepts and therefore do not participate in the hierarchy of the OMOP Standardized Vocabularies CONCEPT_ANCESTOR table. However, the relationships between corresponding 3, 4 and 5-character Concepts exist as Concept Relationships in the CONCEPT_RELATIONSHIP table (see above). | ||
documentation/vocabulary/icd9cm.txt · Last modified: 2016/06/04 23:16 by cgreich
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