> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-ct-specifications/snomed-ct-to-icd-10-map-specification/map-structure/7-data-structure-and-distribution-format.md).

# Data Structure and Distribution Format

Since January 2013, the SNOMED CT International Edition release package includes a mapping table from clinical concepts in SNOMED CT to codes listed in ICD-10. SNOMED CT to ICD-10 maps are represented as members of a single reference set called the ICD-10 Extended Reference Set. This reference set contains all Map member data.

Incremental changes to the ICD-10 will be documented employing the versioning mechanism supported by the standard SNOMED CT Release File Specification.

SNOMED International welcomes the opportunity to work with organizations or institutions who are interested in undertaking usage validation of the SNOMED CT to ICD-10 Map. Please contact <info@snomed.org> for more information.

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