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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 represents 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 statistical classification.

Map relationships

The granularity and purpose of ICD-10 is different from that of SNOMED CT. SNOMED CT is a comprehensive reference terminology that supports both general and highly specific concepts. Each concept is defined by a set of attribute-value pairs (relationships) which uniquely define it distinct from all other concepts. SNOMED CT supports a model of meaning which specifies correct attributes and value sets for each domain of meaning.

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All pre-coordinated concepts issued by the IHTSDO SNOMED International within the current international release of SNOMED CT with active status within the following SNOMED CT domains may be mapped:

• Clinical finding (disorders and findings) Concept.id 404684003 and descendants
• Event Concept.id 272379006 and descendants
• Situation with explicit context Concept.id 243796009 and descendants excluding Procedure with explicit context Concept.id 129125009 and its descendants

Target domain context and scope

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 not within out of scope for this ICD-10 map.

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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 specific worksheet], [reference to the numbers for the example(s)].

Mapping Cardinality

The ICD-10 map has cardinality of one SNOMED CT source concept to zero-to-many ICD-10 classification codes. Zero target codes are appropriate if the source concept is not classifiable or is awaiting editorial review for guidance. 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. These Map members will be coordinated in mapGroups each yielding at most one target.page-break