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This mapping is a tabular, knowledge-based cross-link from SNOMED CT to = ICD-10 in which the most accurate ICD-10 target code or codes that best rep= resents the SNOMED CT concept are linked. The ICD-10 map is a link directed= from the source SNOMED CT concept to the target ICD-10 s= tatistical classification.
The granularity and purpose of ICD-10 is different from that of SNOMED C= T. SNOMED CT is a comprehensive reference terminology that supports both ge= neral and highly specific concepts. Each concept is defined by a set of att= ribute-value pairs (relationships) which uniquely define it distinct from a= ll other concepts. SNOMED CT supports a model of meaning which specifies co= rrect attributes and value sets for each domain of meaning.
ICD-10 is a classification of diseases and related health problems with = granularity of definition that has been chosen to provide utility for purpo= ses of epidemiology and statistical reporting of mortality and morbidity. I= CD-10 was created to classify a clinical concept by defining the classes (o= r 'buckets' of meaning) which contain the concept within the universe of IC= D-10 classes.
Only domains of SNOMED CT which overlap in meaning with those of ICD-10 = will be mapped. Due to differences in granularity, purpose and rubrics, ass= ignment of a mapping equivalence between the SNOMED CT source and ICD-10 ta= rget code is usually not appropriate. Instead, the ICD-10 map will link a S= NOMED CT source concept to the ICD-10 code which contains the meaning of th= e SNOMED CT concept as conceptualized by ICD-10.
All pre-coordinated concepts issued by SNOMED International within the c= urrent international release of SNOMED CT with active status within the fol= lowing SNOMED CT domains may be mapped:
All chapters of ICD-10 are considered within scope for this ICD-10 map. = The Morphology of Neoplasms, which is a nomenclature of codes designed for = use in conjunction with Chapter 11 Neoplasms, is out of scope for this ICD-= 10 map.
The scope of ICD-10 is described in WHO's Volume 2 as follows: "The ICD-= 10 is primarily designed for the classification of diseases and injuries de= signated as a formal diagnosis. ICD-10 also classifies signs, symptoms, abn= ormal findings, complaints, and social circumstances that may appear in a h= ealth record. Thus ICD-10 is used to classify data recorded under headings = such as 'diagnosis', 'reason for admission', 'conditions treated', and 'rea= son for consultation'."
Many SNOMED CT concepts within the source domains may be normal findings= or other concepts not intended for classification by ICD-10. See Exemplar:= NotClassifiable, #1-19 for examples. Throughout the rest of this document,= exemplar references will be abbreviated "Exemplar: [reference to the speci= fic worksheet], [reference to the numbers for the example(s)].
The ICD-10 map has cardinality of one SNOMED CT source concept to zero-t= o-many ICD-10 classification codes. Zero target codes are appropriate if th= e source concept is not classifiable or is awaiting editorial review for gu= idance. In all other cases, one or more map targets will be assigned. This = is usually no more than three. One or more Map members will be required for= the knowledge-based mapping to each ICD-10 classification code target. The= se Map members will be coordinated in mapGroups each yielding at most one t= arget.